Volume 11, Issue 19 October 4, 2023 Previous Issue GO TO SECTION Cover Picture Free Access Cs3Cu2I5 Single Crystal for Efficient Direct X-Ray Detection (Advanced Optical Materials 19/2023) Qinhua Wei, Xiongsheng Fan, Peng Xiang, Laishun Qin, Wenjun Liu, Tongyu Shi, Hang Yin, Peiqing Cai, Yufeng Tong, Gao Tang, Zugang Liu, Paul K. Chu, Hongsheng Shi, Yanliang Liu, Xue-Feng Yu 2370073 First Published: 04 October 2023 Description unavailable Cs3Cu2I5 Single Crystal for Efficient Direct X-Ray Detection In article number 2300247, Laishun Qin, Hongsheng Shi, Yanliang Liu, Xue-Feng Yu, and colleagues demonstrate a high-quality Li-doped Cs3Cu2I5 single crystal grown by the Bridgman method that was initially applied as a semiconductor for direct X-ray detection. The Cs3Cu2I5:Li X-ray detector exhibits a high sensitivity of 831.1 µC Gyair−1 cm−2 and low detection limit of 34.8 nGyair s−1, and it reveals a clear outline of the key image in the scanning mode under X-ray excitation. Abstract PDF Request permissions Inside Front Cover Free Access Fully Implantable and Retrievable Upconversion Waveguides for Photodynamic Therapy in Deep Tissue (Advanced Optical Materials 19/2023) Zhao Shi, Xiaohan Gao, Xue Cai, Hongyou Zhao, Xiuhong Wang, Lingyun Zhao, Lan Yin, He Ding, Xing Sheng 2370074 First Published: 04 October 2023 Description unavailable Fully Implantable and Retrievable Upconversion Waveguides for Photodynamic Therapy in Deep Tissue Effective photodynamic therapy (PDT) is limited by the low penetration of visible light in biological tissues. In article number 2300689, Xing Sheng, He Ding, and colleagues develop fully implantable, wirelessly powered upconversion waveguides as in vivo light sources for PDT to treat tumors in the deep tissue of mice. This implant efficiently and precisely delivers photons into the deep tissue by IR-to-visible upconversion and could be retrieved after treatments. Abstract PDF Request permissions Inside Back Cover Free Access Nonlinear Dispersion Relation and Out-of-Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers (Advanced Optical Materials 19/2023) Marko M. Petrić, Viviana Villafañe, Paul Herrmann, Amine Ben Mhenni, Ying Qin, Yasir Sayyad, Yuxia Shen, Sefaattin Tongay, Kai Müller, Giancarlo Soavi, Jonathan J. Finley, Matteo Barbone 2370076 First Published: 04 October 2023 Description unavailable Nonlinear Dispersion Relation and Out-of-Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers In article number 2300958, Marko M. Petrić, Sefaattin Tongay, Giancarlo Soavi, Matteo Barbone, and colleagues investigate second and third harmonic generation in MoSSe and WSSe Janus monolayers. They map the full second-order susceptibility tensor, including out-of-plane components, additionally revealing the nonlinear dispersion near exciton resonances. This sets a bedrock for understanding the nonlinear optical properties of Janus transition metal dichalcogenides and probing their use in the next-generation on-chip multifaceted photonic devices. Abstract PDF Request permissions Back Cover Free Access Strong Coupling in Two-Phase Metamaterials Fabricated by Sequential Self-Assembly (Advanced Optical Materials 19/2023) Jelena Wohlwend, Georg Haberfehlner, Henning Galinski 2370077 First Published: 04 October 2023 Description unavailable Strong Coupling in Two-Phase Metamaterials Fabricated by Sequential Self-Assembly In article number 2300568, Jelena Wohlwend and colleagues develop a scalable approach to fabricate two-phase metamaterials through sequential self-assembly. The resulting metamaterial consists of a Cu network phase and a Sn nanoparticle phase. By employing electron energy loss spectroscopy, they resolve a transition from weak to strong coupling between the two phases. Abstract PDF Request permissions Masthead Free Access Masthead: (Advanced Optical Materials 19/2023) 2370075 First Published: 04 October 2023 PDF Request permissions Reviews CsPbX3 Based X-Ray Detectors Shenghuan Shi, Huanhuan Yao, Daixie Chen, Zhizai Li, Zhuang Xu, Qian Wang 2300795 First Published: 15 June 2023 Description unavailable The crystal structure of CsPbX3 is first presented in this review, and then three single crystal growth methods and two quantum dot synthesis methods are systematically introduced. The research progress of X-ray detection is also introduced for different material types and detector types. Finally, the challenges and development prospects of CsPbX3 are discussed. Abstract Full text PDF References Request permissions Recent Progress of Quantum Dot Infrared Photodetectors Zan Wang, Yunjiao Gu, Xiaoman Li, Yan Liu, Fenghua Liu, Weiping Wu 2300970 First Published: 31 July 2023 Description unavailable Quantum dot (QD) infrared (IR) photodetectors have significant potential in various fields such as environmental monitoring, biomedicine, imaging, and communications. This review focuses on the advances made in QD IR photodetectors, highlighting key aspects including devices, integration of QDs with other materials and structures to form hybrid photodetectors, as well as the applications of QD IR photodetectors in imaging sensors. Abstract Full text PDF References Request permissions Research Articles Cs3Cu2I5 Single Crystal for Efficient Direct X-Ray Detection Qinhua Wei, Xiongsheng Fan, Peng Xiang, Laishun Qin, Wenjun Liu, Tongyu Shi, Hang Yin, Peiqing Cai, Yufeng Tong, Gao Tang, Zugang Liu, Paul K. Chu, Hongsheng Shi, Yanliang Liu, Xue-Feng Yu 2300247 First Published: 28 June 2023 Description unavailable High-quality pure and Li-doped Cs3Cu2I5 single crystals are grown by the Bridgman method, and a direct X-ray detector is fabricated with vertical device configuration of Au/Cs3Cu2I5 single crystal/PCBM/Au. The Li+ dopant enhances the photoelectric properties of the Cs3Cu2I5 single crystal by increasing the mobility-lifetime (μτ) product from 1.4 × 10−4 to 2.9 × 10−4 cm2V–1. The sensitive direct X-ray detector exhibits a high sensitivity of 831.1 µC Gyair−1 cm−2 and low detection limit of 34.8 nGyair s−1 with negligible baseline current drift and excellent stability. Abstract Full text PDF References Request permissions Fully Implantable and Retrievable Upconversion Waveguides for Photodynamic Therapy in Deep Tissue Zhao Shi, Xiaohan Gao, Xue Cai, Hongyou Zhao, Xiuhong Wang, Lingyun Zhao, Lan Yin, He Ding, Xing Sheng 2300689 First Published: 17 August 2023 Description unavailable A fully implantable, wirelessly powered upconversion waveguide is introduced, which is employed as an in vivo light source for photodynamic therapy for tumors in the deep tissue. This implant efficiently and precisely delivers photons into the deep tissue by infrared (IR)-to-visible upconversion and can be retrieved after treatments. Abstract Full text PDF References Request permissions Open Access Nonlinear Dispersion Relation and Out-of-Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers Marko M. Petrić, Viviana Villafañe, Paul Herrmann, Amine Ben Mhenni, Ying Qin, Yasir Sayyad, Yuxia Shen, Sefaattin Tongay, Kai Müller, Giancarlo Soavi, Jonathan J. Finley, Matteo Barbone 2300958 First Published: 01 August 2023 Description unavailable The nonlinear optical properties of MoSSe and WSSe Janus monolayers are investigated. The comprehensive mapping of the full second-order susceptibility tensor of MoSSe, including its out-of-plane components, is revealed using polarization-resolved spectroscopy. Furthermore, the effective third-order susceptibility is presented, and the second-order nonlinear dispersion near exciton resonances is measured for both materials at room and cryogenic temperatures. Abstract Full text PDF References Request permissions Open Access Strong Coupling in Two-Phase Metamaterials Fabricated by Sequential Self-Assembly Jelena Wohlwend, Georg Haberfehlner, Henning Galinski 2300568 First Published: 28 July 2023 Description unavailable Using sequential self-assembly (SSA) a two-phase metamaterial (TPM), consisting of a disordered Cu network and Sn nanoparticles is formed. Electron energy loss spectroscopy (EELS) of the TPM reveals inhomogeneous light localization in the network and concurrent dipolar and higher order localized surface plasmon resonances (LSPR) in the nanoparticle phase. Moreover, a transition from weak to strong coupling between the two-phases is observed. Abstract Full text PDF References Request permissions Efficient Charge Transfer in Narrowband Organic Photodiodes Based on Self-Assembled Heterojunction for Spectrally Selective Photodetection and Imaging Zhenhui Wang, Yueyue Wang, Manyu Liu, Meili Xu, Zhixiang Jiang, Yuanhong Gao, Hong Meng, Xinwei Wang 2300493 First Published: 19 May 2023 Description unavailable To improve the quality of the photoactive/depletion layer interface in narrowband organic photodiodes, a new fabrication strategy based on self-assembled heterojunction is herein proposed. The fabricated device exhibits a narrow full-width-at-half-maximum and a high detectivity, and it can be applied for spectrally selective imaging. The self-assembly strategy is also feasible for mass-scale fabrication. Abstract Full text PDF References Request permissions Open Access Förster Resonance Energy Transfer Sensitized Singlet Fission in BODIPY-Pentacene Dimer Conjugates Anna-Sophie Wollny, Giulia Lavarda, Ilias Papadopoulos, Ismael López-Duarte, Henrik Gotfredsen, Yuxuan Hou, Rik R. Tykwinski, Tomás Torres, Dirk M. Guldi 2300500 First Published: 28 June 2023 Description unavailable 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) is used for the first time as an energy donor antenna in combination with a Singlet Fission (SF) performing pentacene dimer to widen the spectral range for SF and study the influence of Förster Resonance Energy Transfer on the efficiency of the SF process. Abstract Full text PDF References Request permissions Transparent Multicolor Electrochromic Displays with Ingenious Hues Adjustment by Integrating Cholesteric Liquid Crystal with Viologen Gel Shiqing Zhao, Linsen Chen, Wenbin Huang, Yan-Hua Liu 2300503 First Published: 12 May 2023 Description unavailable The colorful viologen gel-based electrochromic displays (ECDs) show three colors of magenta, blue, and red through introducing substituents of phenyl, ethyl, and octyl, respectively. Furthermore, RGB viologen gels-based ECDs are integrated with cholesteric liquid crystal layers vertically, which exhibit abundant overlapping colors and have flexible color modulating modes by changing rotation angle, applying voltage, and changing chiral dopants’ concentration. Abstract Full text PDF References Request permissions Efficient and Stable OLEDs with Inverted Device Structure Utilizing Solution-Processed ZnO-Based Electron Injection Layer Ning Li, Tianxin Li, Lin Song Li, Jian Li 2300467 First Published: 28 May 2023 Description unavailable By passivating the surface of the ZnO layer through a thin Al layer deposition, an inverted organic light-emitting diode (OLED) device employing Pd(II) 7-(3-(pyridine-2-yl-κN)phenoxy-κC)(benzo-κC)([c]benzo[4,5]imidazo-κN)[1,2-a][1,5]naphthyridine aggregates demonstrates a long measured lifetime (LT95) of 875 h with an initial brightness of 13 521 cd m−2 corresponding to an estimated LT95 of 73 244 h at 1000 cd m−2. Abstract Full text PDF References Request permissions Exploring the Key Factors of TADF Materials as Sensitizers: Toward High-performance Triplet Fusion Upconversion Ye Tian, Yi-Zhong Shi, Xiao-Chun Fan, Shi-Gang Wan, Xiao-Mei Wang, Kai Wang, Jia Yu, Xiao-Hong Zhang, Chang-Qing Ye 2300504 First Published: 15 May 2023 Description unavailable Employing metal-free thermally activated delayed fluorescence (TADF) materials as novel photosensitizers (PSs) for triplet–triplet annihilation upconversion (TTA-UC) systems has received great attention. Nevertheless, how to choose suitable TADF materials still deserves further research. Herein, by systematically investigating, it is found that employing intersystem crossing (ISC) dominated multiple resonance (MR) TADF materials as the PS is the key to achieving efficient TTA-UC performance. Abstract Full text PDF References Request permissions Light-Responsive Nematic Colloids and Colloidal Crystals Devika Venkuzhy Sudhakaran, Dinesh Kumar Sahu, Osamu Haba, Surajit Dhara 2300513 First Published: 27 July 2023 Description unavailable A 2D light-responsive colloidal crystal is prepared by dispersing silica microspheres coated with azo-dendrimer molecules in a nematic liquid crystal. Here, the light-induced transformation of topological defects plays a crucial role. The results provide a potential strategy to manipulate colloidal crystals of pre-designed particles with complex architecture to obtain tunable optical materials. Abstract Full text PDF References Request permissions Unique Self-Reduction of Transitional Metal Ion in a Borate with Planar [BO3]3− Groups Liwei Wu, Yuxing Bai, Huimin Chen, Lirong Zheng, Huan Yi, Li Wu, Zhenpeng Hu, Xinzheng Zhang, Yongfa Kong, Yi Zhang, Jingjun Xu 2300515 First Published: 28 May 2023 Description unavailable The unique self-reduction of Mn4+→Mn2+ is realized in borate with isolated BO3 groups, which originates from the oxygen and lithium vacancies. In addition, the bivalent activators can exist in the lattice stably to lead to good chromaticity-coordinate stability. Abstract Full text PDF References Request permissions Continuous Ultra-Broadband Near-Infrared Sc2O3-Based Nanophosphor Realized by Spectral Bridge of Cr3+-Yb3+-Cr4+ for Multiple Optical Applications Yining Wang, Mengmeng Shang, Shuai Huang, Yixin Sun, Yiying Zhu, Xiaole Xing, Peipei Dang, Jun Lin 2300517 First Published: 20 June 2023 Description unavailable Yb3+ is co-doped into Cr3+/4+-activated Sc2O3 nanophosphors to form a Cr3+-Yb3+-Cr4+ spectral bridge and energy transfer bridge, realizing a continuous near-infrared ultra-broadband (650–1600 nm) emission. Sc2O3:Cr3+-Yb3+-Cr4+ nanophosphors are demonstrated to have the potential for integration into portable devices for multifunctional applications in spectral analysis and temperature sensing. Abstract Full text PDF References Request permissions Third Harmonic Generation Enhanced by Generalized Kerker Condition in All-Dielectric Metasurfaces Ai-Yin Liu, Jou-Chun Hsieh, Kuang-I Lin, Snow H. Tseng, Hui-Hsin Hsiao 2300526 First Published: 27 June 2023 Description unavailable The effect of the multipolar resonances on third-harmonic (TH) signals of dielectric metasurfaces is investigated. At the generalized Kerker condition, the constructive interference of the total electric dipole and magnetic dipole modes results in a suppression of backward scattering and a predominant near-field inside silicon nanopillars, showing a TH enhancement of two orders of magnitude compared with the toroidal dipole resonance. Abstract Full text PDF References Request permissions Programmable Patterned Dynamic Scattering of Liquid Crystals/Epoxy-based Polymer Composite Film Sandwiched between Two Fully Covered Electrodes Gang Chen, Jianying Zhang, Yunxiao Ren, Chang Sun, Wei Hu, Huai Yang, Deng-Ke Yang 2300537 First Published: 28 June 2023 Description unavailable A multilevel patterned dynamic scattering film sandwiched between two fully covered electrodes is prepared by successively programmed polymerization of liquid crystalline epoxy in negative liquid crystal (LC) with different photomasks. This work would provide some inspiration in preparing patterned LC films with tailored response behaviors, which are sandwiched between two fully covered electrodes instead of the substrates requiring high-cost treatment to conductive layers. Abstract Full text PDF References Request permissions Carbonized Oligomer-Like Dots: Efficient Persistent Room-Temperature Phosphorescent Materials with Superior Mechanical Strength Xiaofeng Lin, Daxiang Shi, Beichi Luo, Zecong Ye, Yingxiao Mu, Zhiyong Yang, Guobin Yi, Zhenguo Chi, Yanping Huo, Bai Yang 2300052 First Published: 09 July 2023 Description unavailable Carbonized oligomer-like dots (CODs) as supramolecular clusters with low carbonization degree formed by hydrogen bonding of low molecular weight repeating units showcase efficient persistent room temperature phosphorescence, which simultaneously achieves excellent capability of 3D molding, hot melt adhesive, and high mechanical strength. Abstract Full text PDF References Request permissions High-Throughput Tailorable Fabrication of Long-Range Ordered Plasmonic Coaxial Multi-Circular Nano-Slit Arrays Down to 2 nm for SERS Detection Sisi Yan, Chuhong Zhu, Anyang Wang, Jiacheng Sun, Yingjie Hang, Bin Chen, Xiujuan Wang, Nianqiang Wu, Haibin Tang, Liaoyong Wen, Guowen Meng 2300508 First Published: 25 June 2023 Description unavailable A cost-effective and robust nanofabrication method is reported for coaxial multi-circular nano-slit arrays with tailorable structural features. The slit width between the outer rings and the inner pillars/rings can be squeezed down to 2 nm with high reproducibility and throughput. Such narrow metallic nano-slits can generate strong “hot spots,” allowing for highly sensitive SERS detection of pesticides in lake water. Abstract Full text PDF References Request permissions Ligand-Tuned Perylene Diimide-Based Versatile Coordination Polymers for Photoluminescent Sensing and Optoelectronics Xiaobo Shang, Inho Song, Jeong Hyeon Lee, Jin Chul Kim, Hiroyoshi Ohtsu, Wanuk Choi, Jaeyong Ahn, Ke Gao, Mingming Zhang, Masaki Kawano, Sang Kyu Kwak, Joon Hak Oh 2300534 First Published: 25 June 2023 Description unavailable A series of coordination polymers (CPs) with perylene diimides as ligands are synthesized. LeuPDI-Cd shows chiral self-recognition phenomenon due to thermodynamic stability of homochiral CPs over heterochiral counterparts. Bulky LeuPDI-Cd can selectively detect ethylenediamine in photoluminescent sensing, while micro-/nano-sized MetPDI-Cd can be applied to photodetectors and chemiresistive sensors, demonstrating that tuning ligands of CPs is an efficient strategy for various sensors. Abstract Full text PDF References Request permissions Mitigation of the Moiré Effect in Overlapped Optical Films by Lateral Buckling of Sharp Edges of Prism Arrays Yonghyeon Lee, Seong Gil Heo, Min-Gi Jo, Chaerim Lee, Enkhmandakh Enkhtaivan, Hyemin Lee, Hyunsik Yoon 2300539 First Published: 23 July 2023 Description unavailable Microprism arrays with laterally buckled edges are exploited to mitigate the moiré effect, which is inevitable when overlapping two periodic patterns. By applying compressive stress on the prism arrays consisting of hydrogel materials, only sharp edges can be laterally buckled. The shapes are replicated to produce optical films to reduce the moiré effect and maintain the optical performance. Abstract Full text PDF References Request permissions Mono- and Bi-Dentate Chiral Ligands Lead to Efficient Circularly Polarized Luminescence in 0D and 3D Semiconducting Copper(I) Iodides Xiaoqin Ji, Yang Liu, Ruiqian Li, Zixuan Zhang, Xuanyu Zhang, Congcong Chen, Jian Chen, Haipeng Lu, Rui Chen, Lingling Mao 2300541 First Published: 13 May 2023 Description unavailable With the incorporation of mono- and bi-dentate chiral organic ligands, four pairs of 0D and 3D hybrid chiral copper(I) iodides are successfully synthesized with similar Cu4I4 cubane tetramer building units. These materials demonstrate excellent luminescent properties and circularly polarized luminescence emissions with high photoluminescence quantum yield and long-term stability. Abstract Full text PDF References Request permissions Ultraviolet–Visible Photodetector Driven by Local Electrostatic Field from Chargeable Electret Lili Luo, Rui Hao, Xiaoliang Hu, Yingtao Li, Erqing Xie, Zemin Zhang 2300543 First Published: 17 May 2023 Description unavailable A high-performance photodetector is achieved by implementing a chargeable fluorinated ethylene propylene copolymer electret to regulate carrier transmission properties in the UV–vis sensitive CuBi2O4 channel. It reveals that positive charges in the electret layer attract electrons and create a pure hole channel with minimal carrier recombination and scattering that sheds light on the application in optoelectronic devices. Abstract Full text PDF References Request permissions Chiral TADF Polymers Realizing Highly-Efficient Deep-Red Circularly Polarized Electroluminescence Over 660 nm Jin-Ming Teng, Chuan-Feng Chen 2300550 First Published: 08 May 2023 Description unavailable Using the strategy of chiral donor-acceptor copolymerization, two novel chiral thermally activated delayed fluorescent polymers are synthesized. The circularly polarized polymer light-emiiting diode devices are then prepared through a solution process where intense deep-red-emission circularly polarized electroluminescence signals from the corresponding devices fabricated with R-P and S-P are clearly detected at the wavelength of 662 nm. Abstract Full text PDF References Request permissions Optically Transparent Metasurface with High RF Transmittance and Wide-Angle Stability for Dual Bands and Dual Polarizations Rui Zhe Jiang, Jun Wei Wu, Qian Ma, Jing Cheng Liang, Li Jie Wu, Qun Yan Zhou, Jun Yan Dai, Qiang Cheng, Tie Jun Cui 2300553 First Published: 28 May 2023 Description unavailable The proposed optical transparent metasurface possesses high transparency in three bands: the lower RF band (RF1, 2.2–3.2GHz), the upper RF band (RF2, 4.4–5.2GHz), and the visible light band. When the plane waves transmit through the metasurface, it behaves like a lossless slab with RF antireflection in dual-band. The RF transmission in RF1 and RF2 remains high in a wide angular range, including the elevation and azimuth angles. Abstract Full text PDF References Request permissions Tunable Bound States in the Continuum in a Reconfigurable Terahertz Metamaterial Yuwei Huang, Kelson Kaj, Chunxu Chen, Zhiwei Yang, Richard D. Averitt, Xin Zhang 2300559 First Published: 09 July 2023 Description unavailable A structurally tunable BIC terahertz metamaterial is introduced theoretically and experimentally. Control of the bending angle of the metamaterial by thermal actuation modifies the capacitance, enabling tuning from a quasi-BIC state with a quality factor of 26 to the BIC state. Additional insight into the tunable electromagnetic response is obtained using temporal coupled mode theory. Abstract Full text PDF References Request permissions Reconfigurable Geometrical Phase Spatial Light Modulator Using Short-Pitch Ferroelectric Liquid Crystals Zhi-Bo Sun, Zheng-Nan Yuan, Vigneshwaran Swaminathan, Valerii Vashchenko, Olena Vashchenko, Alex Yuk Lung Cheung, Lei Lu, Hoi-Sing Kwok, Abhishek Kumar Srivastava 2300561 First Published: 30 August 2023 Description unavailable A Short Pitch Ferroelectric Liquid Crystal (FLC) is proposed for the next-generation spatial light modulators used in real-time holograms. Both hologram display and beam steering can be achieved with the unique properties of short-pitch FLCs; they are fringe field effect free (<3 µm pitch) with a fast response time (250 µs). Abstract Full text PDF References Request permissions Realizing an Optical Micro-Cavity in a CuCo2O4-W-CuCo2O4 Thin Film Stack for Spectrally Selective Solar Absorbers Silpa S., Srinivas G., Arup Biswas, Harish C. Barshilia, Vinayak B. Kamble 2300567 First Published: 25 July 2023 Description unavailable The ability to tap the potential of non-renewable sources is severely limited by the availability of suitable and efficient materials. This paper demonstrates enhanced optical absorption (α = 0.9) and low thermal emittance (ε < 0.2) achieved in transition metal oxide-based multilayer coating with simple structure making an optical micro-cavity. Abstract Full text PDF References Request permissions Precision X-Ray Time-Lapse Flexible Imaging from Fluoride Nanocrystals with the Constructed Deep Traps Songcheng Peng, Luwei Chen, Lan Lu, Peng Zhang, Hongyu Wen, Shuangpeng Yan, Wei Wang, Yuanyuan Xiong, JinKang Lu, Jianbei Qiu, Jie Yu, Xue Yu, Xuhui Xu 2300572 First Published: 06 June 2023 Description unavailable Monodisperse NaLuF4: Tb3+ nanocrystals with Cs+ ions instead of Na+ in the lattice matrix amplify the storage capacity of deep traps and significantly enhance the photo-stimulated luminescence performance of NaLuF4: Tb3+ nanocrystals for accurate X-ray time- lapse imaging. Abstract Full text PDF References Request permissions Dynamically Tunable Structural Colors Enabled by Pixelated Programming of Soft Materials on Thickness Mengting Huang, Yifei Wang, Xuan Liu, Songyu Zhang, Cong-Long Yuan, Hong-Long Hu, Zhi-Gang Zheng 2300573 First Published: 09 June 2023 Description unavailable A digitalized lithography technique is employed to create pixelated photoresist microarrays of different heights, allowing precise control over the thickness of the liquid crystal (LC) layer. Simultaneously, dynamic and reversible tunability of the structural color is achieved by stimuli-responsive LCs. Applications of this technology in optical steganography, color-based thermal sensors, and optical coding are also explored. Abstract Full text PDF References Request permissions Particle Size Controlled Chiral Structural Color of Monodisperse Cholesteric Liquid Crystals Particles Jialei He, Sizhe Liu, Guohao Gao, Miki Sakai, Mitsuo Hara, Yuto Nakamura, Hideo Kishida, Takahiro Seki, Yukikazu Takeoka 2300296 First Published: 09 July 2023 Description unavailable Bioinspired monodisperse cholesteric liquid crystals (CLCs) particles with a diameter less than 5 µm are prepared, exhibiting bright structural color, and are more suitable for pigment application. Particle size control enables effective modulation of hues without altering chemical composition. In addition, an encrypted QR code is prepared by utilizing angle-independent chiral structural color of CLCs particles. Abstract Full text PDF References Request permissions Multicolor Patterning Inside a Metal-Organic Framework Yusheng Zhang, Yuming Su, Xiaolin Fan, Boxuan Zhao, Xin Hua, Bingling Dai, Cheng Wang 2300364 First Published: 17 June 2023 Description unavailable In a metal-organic framework (MOF) crystal, the multicolor three-dimensional (3D) patterns have been printed. This work realizes a 3D optical data storage motif using 3D arrays of colorful dots. The initial test already has a data storage density surpassing that of the blue-ray optical disk. Through the combination of different initiator molecules of different emission colors, the data storage density is expected to increase further. Abstract Full text PDF References Request permissions Open Access 4f-Less Terahertz Optical Pattern Recognition Enabled by Complex Amplitude Modulating Metasurface Through Laser Direct Writing Zongyuan Wang, Bin Hu, Jingyu Liu, Guocui Wang, Weiguang Liu, Chenjie Xiong, Jianzhou Huang, Juan Liu, Yan Zhang 2300575 First Published: 25 May 2023 Description unavailable A full-diffraction-based 4f-less optical pattern recognition (OPR) method is proposed using a single complex amplitude modulating metasurface in the THz band, which is valid for systems with large Fresnel numbers. Moreover, a laser-induced graphene technique is applied for processing the device. A 15 mm × 15 mm metasurface can be fabricated by one-step laser writing in 34 s. Abstract Full text PDF References Request permissions Transformation of Cs3Bi2Br9 to Cs2AgBiBr6 Lead-Free Perovskite Microcrystals Through Cation Exchange Lotte Clinckemalie, Rafikul Ali Saha, Donato Valli, Eduard Fron, Maarten B. J. Roeffaers, Johan Hofkens, Bapi Pradhan, Elke Debroye 2300578 First Published: 04 May 2023 Description unavailable A promising two-step synthesis approach is proposed by the introduction of a foreign ion. This work has deciphered a cation exchange (CE) transformation mechanism of 0D layered Cs3Bi2Br9 to 3D Cs2AgBiBr6 perovskite by introducing silver ions. Moreover, complete CE results in phase-pure Cs2AgBiBr6 microcrystals exhibiting excellent photonic properties, superior to their counterparts synthesized by direct synthesis methods. Abstract Full text PDF References Request permissions Quartz-Like Structure, Optical Activity, and High Stability in the First Chiral Cation-Coordinated Perovskite Semiconductor Xiang-Bin Han, Chao-Yang Chai, Ming-Liang Jin, Chang-Chun Fan, Wen Zhang 2300580 First Published: 27 June 2023 Description unavailable The first pair of new cation-coordinated perovskites with high stability, achieved through a coordination bond between the cation and [PbX5] anion instead of the weak hydrogen bonds and van der Waals force presented in conventional ionic perovskites, is reported. The chirality originates from the helical assembly of achiral units, resulting in an optical rotatory power of 16.84° mm−1 at 404 nm. Abstract Full text PDF References Request permissions Vertical Photodetectors Based on In Situ Aligned Single-crystalline PbS Nanocuboids Sandwiched between Graphene Electrodes Jintao Fu, Chan Yang, Changbin Nie, Feiying Sun, Genglin Li, Shuanglong Feng, Xingzhan Wei 2300584 First Published: 06 June 2023 Description unavailable A vertical photodetector composed of lead sulfide nanocuboids channels, sandwiched between two graphene electrodes, which exhibits a high responsivity of 130 A W−1 and a detectivity of 3 × 109 cm Hz1/2 W-1 under 2700 nm illumination at room temperature, is proposed. It offers a promising approach for complementary metal oxide semiconductor-compatible short-wave infrared detection devices with high sensitivity. Abstract Full text PDF References Request permissions Exceeding 10 000 h of Lifetime in Blue Fluorescent Organic Light-Emitting Diodes by Introducing an Electron Leakage Pathway You Na Song, Sunwoo Kang, Taekyung Kim 2301193 First Published: 02 August 2023 Description unavailable The concept of electron leakage-pathway (ELP) is to reduce the damage of electron-blocking layer (EBL) and enhance the operational stability. Our study shows that using an anthracene core with high bond dissociation energy in the anionic state as the ELP is the most effective way in increasing the lifetime of the OLED, demonstrating over the LT50 of over 10 000 h. Abstract Full text PDF References Request permissions Double-Key Optical Information Encryption Enabled by Multi-State Excitation–Emission of Mn-Doped Metal Chlorides Yijun Zhao, Hao Zhao, Yunsong Di, Cihui Liu, Fangjian Xing, Xiaoming Wen, Baohua Jia, Zhixing Gan 2301349 First Published: 22 August 2023 Description unavailable A double-key optical information encryption strategy is developed based on multi-state excitation–emission of Mn-doped metal chlorides. Four information channels can be encrypted into a single luminescent pattern. As a demo, an encrypted quick response code is created, which can only be decrypted with both the "excitation wavelength key" and "capture time key". The double-key mechanism enhances the level of security and confidentiality. Abstract Full text PDF References Request permissions Editor's Choice Chiral 2D/Quasi-2D Perovskite Heterojunction Nanowire Arrays for High-Performance Full-Stokes Polarization Detection Yiman Zhao, Zhonghao Zhou, Xiaolong Liu, Ang Ren, Shiyang Ji, Yuwei Guan, Zhen Liu, Haidi Liu, Penghao Li, Fengqin Hu, Yong Sheng Zhao 2301239 First Published: 11 August 2023 Description unavailable A type of compact and high-performance Stokes photodetector is demonstrated with chiral 2D/quasi-2D perovskite heterojunction nanowire arrays. The built-in electric field at junction enables amplified circular polarization sensitivity. The ordered alignment of nanowire arrays facilitates outstanding linear polarization response. The device shows good accuracy for full-Stokes polarization detection and excellent photoresponsiveness. Abstract Full text PDF References Request permissions Open Access Plasmonic-Enhanced NIR-II Downconversion Fluorescence beyond 1500 nm from Core–Shell–Shell Lanthanide Nanoparticles Jiamin Xu, Ming Fu, Chengyu Ji, Anthony Centeno, Dong Kuk Kim, Koen Evers, Sandrine E. M. Heutz, Rupert Oulton, Mary P. Ryan, Fang Xie 2300477 First Published: 20 June 2023 Description unavailable A novel hybrid structure consisting of lanthanide core–shell–shell downconversion nanoparticles hybridized with a gold hole-cap nanoarray is designed for the purpose of studying plasmon-enhanced near-infrared second downconversion fluorescence beyond 1500 nm. Abstract Full text PDF References Request permissions Highly Sensitive Long-Wave Infrared Photodetector Based on Two-Dimensional Hematite α-Fe2O3 Suofu Wang, Hongtao Liu, Zhangyu Cao, Xiuxiu Wang, Li Zhang, Jingzu Ding, Yunzhou Xue, Tao Han, Feng Li, Lei Shan, Mingsheng Long 2300382 First Published: 18 May 2023 Description unavailable High-quality single-crystal hematite α-Fe2O3 nanoflakes are synthesized via chemical vapor deposition method for the first time. The α-Fe2O3 photodetector exhibits excellent ability in uncooled long-wave infrared light detection. The competitive performance includes a high photoresponsivity of 23.8 A W−1 and high D* of 3.28×109 cmHz1/2 W−1, with a very low noise equivalent power of 8.94×10-14 W Hz−1/2 and ultrafast speed in the visible range with τr = 3.5 µs and τd = 3.8 µs. Abstract Full text PDF References Request permissions