Volume 11, Issue 15 August 7, 2023 Previous Issue GO TO SECTION Export Citation(s)Download PDF(s) Cover Picture Free Access Unfolding the Origin of the Ultrafast Optical Response of Titanium Nitride (Advanced Optical Materials 15/2023) Silvia Rotta Loria, Beatrice Roberta Bricchi, Andrea Schirato, Luca Mascaretti, Cristina Mancarella, Alberto Naldoni, Andrea Li Bassi, Giuseppe Della Valle, Margherita Zavelani-Rossi 2370053 First Published: 07 August 2023 Description unavailable Titanium nitride (TiN) boasts a hot electron cooling time 10 times faster than gold. In article number 2300333, Giuseppe Della Valle, Margherita Zavelani-Rossi, and co-workers disclose the origin of this ultrafast and giant response. A numerical model for the modulation of TiN's optical properties is formulated and validated by ultrafast spectroscopy experiments. Following ultrafast photoexcitation, a hot-electron population is created, which then relaxes upon scattering with the lattice and excitation of acoustic waves. A broadband disentanglement of interband and intraband contributions to the permittivity modulation is achieved. Image credit: Lia Tagliavini. Abstract PDF Request permissions Inside Front Cover Free Access The Influence of Dimensionality on the Charge-Density-Wave Transition and its Application on Mid-Infrared Photodetection (Advanced Optical Materials 15/2023) Jialin Li, Hua Bai, Yupeng Li, Junjian Mi, Qiang Chen, Wei Tang, Huanfeng Zhu, Xinyi Fan, Yunhao Lu, Zhuan Xu, Linjun Li 2370054 First Published: 07 August 2023 Description unavailable In article number 2300720, Jialin Li, Yunhao Lu, Zhuan Xu, Linjun Li, and co-workers present the observation of avalanche-like 1D CDW transition phenomenon in (TaSe4)2I and achieve both a high photo responsivity of 1.18 × 103 A W−1 and a large light on/off ratio of 80 at the mid infrared (MIR) region. The dimensionality influence on the charge density wave transition for MIR photodetection is systematically investigated and achieves such high photodetection performance in quasi 1D CDW material, thus paving the way for exploiting them on advanced optoelectronic applications. Abstract PDF Request permissions Inside Back Cover Free Access Emergence and Relaxation of an e–h Quantum Liquid Phase in Photoexcited MoS2 Nanoparticles at Room Temperature (Advanced Optical Materials 15/2023) Pritha Dey, Tejendra Dixit, Vikash Mishra, Anubhab Sahoo, Cheriyanath Vijayan, Sivarama Krishnan 2370056 First Published: 07 August 2023 Description unavailable In article number 2202567, Sivarama Krishnan and co-workers demonstrate that an unusual quantum-liquid-like phase emerges in the ultrafast dynamics of photoexcited nanoscale transition metal dichalcogenide (MoS2) even at room temperature. This work paves the way for exploring exotic quantum dynamics in these systems using time-resolved spectroscopy and realizing applications in quantum- and opto-electronics. Abstract PDF Request permissions Back Cover Free Access Electrically Wavelength-Controllable Color Filters with High Optical Transmittance Using Heterogeneous Chiral Liquid Crystals (Advanced Optical Materials 15/2023) Dahee Wang, Seungmin Nam, Wontae Jung, Hak Jun Yang, Su Seok Choi 2370057 First Published: 07 August 2023 Description unavailable In article number 2202906, Su Seok Choi and co-workers investigate an electrically tunable transmission color filter with extremely low driving voltage. In contrast to conventional reflective color control of chiral liquid crystal (CLC), reconfigurable high transmission color control with tetra color binning using dynamic heterogeneous CLC structure is reported for the first time. Analogue and electrical control of color binning is expected to impact the high-quality optical image control beyond current limits of digital color-pixel binning. Abstract PDF Request permissions Masthead Free Access Masthead: (Advanced Optical Materials 15/2023) 2370055 First Published: 07 August 2023 PDF Request permissions Reviews Advances of Mode-Locking Fiber Lasers in Neural Imaging Sijie Fan, Shuke Wang, Changxi Yang, Frank Wise, Lingjie Kong 2202945 First Published: 28 May 2023 Description unavailable Advances of mode-locking fiber lasers (MFLs) have greatly promoted nonlinear optical microscopy (NOM) for neural imaging. This paper summarizes practical requirements and recent developments of MFLs in multiphoton fluorescence microscopy and introduces the applications of MFLs in parametric NOM. With the emergence of novel high-energy MFLs, their widespread applications in the study of neuroscience can be expected. Abstract Full text PDF References Request permissions Mn2+-Based Luminescent Metal Halides: Syntheses, Properties, and Applications Dehai Liang, Hongbin Xiao, Wensi Cai, Shirong Lu, Shuangyi Zhao, Zhigang Zang, Lei Xie 2202997 First Published: 23 May 2023 Description unavailable The recent progress of Mn2+-based metal halides is systematically summarized in this review, which includes their synthesis methods, emission mechanisms, photophysical properties, and representative applications in X-ray scintillations, white light-emitting diodes, optical anti-counterfeiting technologies, and fluorescent sensors. In the end, the challenges and prospects for developing Mn2+-based metal halides are also proposed. Abstract Full text PDF References Request permissions Recent Progress in Low Threshold Plasmonic Nanolasers Ru Wang, Chunfeng Wang, Yi Ma, Jianli Sun, Peiguang Yan, Chunxiang Xu, Caofeng Pan 2203137 First Published: 31 May 2023 Description unavailable The factors affecting the threshold of plasmonic nanolasers are analyzed, the recent progress in terms of both low threshold devices and application is reviewed, and feasible approaches to threshold reduction as well as more possible applications in the future are discussed. Abstract Full text PDF References Request permissions Research Articles Open Access Unfolding the Origin of the Ultrafast Optical Response of Titanium Nitride Silvia Rotta Loria, Beatrice Roberta Bricchi, Andrea Schirato, Luca Mascaretti, Cristina Mancarella, Alberto Naldoni, Andrea Li Bassi, Giuseppe Della Valle, Margherita Zavelani-Rossi 2300333 First Published: 05 May 2023 Description unavailable Titanium nitride (TiN) boasts a hot electron cooling time one order of magnitude faster than gold. In this work, the origin of the modulation of TiN optical properties is unfolded on a broad spectral range, starting from the increase of carrier and lattice temperatures following ultrafast photoexcitation. The numerical analysis is validated on pump–probe spectroscopy experiments on a TiN film. Abstract Full text PDF References Request permissions The Influence of Dimensionality on the Charge-Density-Wave Transition and its Application on Mid-Infrared Photodetection Jialin Li, Hua Bai, Yupeng Li, Junjian Mi, Qiang Chen, Wei Tang, Huanfeng Zhu, Xinyi Fan, Yunhao Lu, Zhuan Xu, Linjun Li 2300720 First Published: 02 May 2023 Description unavailable Sharp 1D charge density wave (CDW) transition in (TaSe4)2I is experimentally and theoretically investigated and applied for sensitive mid-infrared photodetection; the achieved photo responsivity and on/off ratio are superior to 2D CDW TaS2 and most other low-dimensional materials. This work not only reveals the important role of the dimensionality in CDW transition but also sheds light on the way for advanced mid-infrared application. Abstract Full text PDF References Request permissions Emergence and Relaxation of an e–h Quantum Liquid Phase in Photoexcited MoS2 Nanoparticles at Room Temperature Pritha Dey, Tejendra Dixit, Vikash Mishra, Anubhab Sahoo, Cheriyanath Vijayan, Sivarama Krishnan 2202567 First Published: 02 May 2023 Description unavailable The emergence of a novel dynamic electron–hole quantum liquid phase in photoexcited MoS2 nanoparticles is revealed on ultrafast few-ps timescales through time-resolved femtosecond absorption spectroscopy. This study opens up a new paradigm of dynamic electron–hole liquid phases on ultrashort timescales in transition metal dichalcogenide nanoparticles which could be harnessed in quantum-electronic and excitonic devices. Abstract Full text PDF References Request permissions Electrically Wavelength-Controllable Color Filters with High Optical Transmittance Using Heterogeneous Chiral Liquid Crystals Dahee Wang, Seungmin Nam, Wontae Jung, Hak Jun Yang, Su Seok Choi 2202906 First Published: 28 May 2023 Description unavailable Electrically wavelength-tunable transmission color filters are investigated using heterogeneously stacked chiral liquid crystal (CLC). In contrast to conventional reflection color control of CLC filters, highly transmissive wavelength is controllable with low voltage of 1.4 V using electrically controlled thermal effect. Moreover, analog pixel binning in a tetra-layout is reported beyond current digitally processed pixel binning technology. Abstract Full text PDF References Request permissions 2-in-1 Optimization for High Performance Semitransparent Perovskite Solar Cells Jing Yang, Ziyu Wang, Lu Liu, Le Wang, Zhen Chang, Jianxun Li, Kai Wang, Shengzhong (Frank) Liu 2203140 First Published: 26 April 2023 Description unavailable Semitransparent perovskite solar cells (PSCs) with bandgaps of 2.02 eV, 2.16 eV, and 2.32 eV are fabricated, achieving the champion power-conversion efficiencies of 9.07%, 7.10%, and 7.56%, respectively. The corresponding average visible transmittances are 9.41%, 23.26%, and 43.47%, and crop growth factors are 21.25%, 29.48%, and 37.07%, respectively. Semitransparent PSCs are expected to be used in photovoltaic windows and greenhouses. Abstract Full text PDF References Request permissions Enhanced Photoresponsivity of Perovskite QDs/Graphene Hybrid Gate-Free Photodetector by Morphologically Controlled Plasmonic Au Nanocrystals Shyam Narayan Singh Yadav, Chintam Hanmandlu, Dinesh Kumar Patel, Rajan Kumar Singh, Chun-Yen Chen, Yen-Yu Wang, Chih-Wei Chu, Chi-Te Liang, Chih-Ting Lin, Yu-Jung Lu, Ta-Jen Yen 2300131 First Published: 28 April 2023 Description unavailable To take advantage of the synergistic effects of the three materials, Perovskite QDs/Graphene hybrid gate-free photodetector has been developed. Incorporating shaped gold nanocrystals in Perovskite QDs/Graphene enhanced optical characteristics by intensifying the light–matter interaction and delaying carrier decay by passivating the trap state. As a result, the demonstrated photodetector outperformed the lateral photodetector and achieved the highest optoelectronic performance. Abstract Full text PDF References Request permissions Efficient Solar Spectrum-Like White-Light Emission in Zinc-Based Zero-Dimensional Hybrid Metal Halides Shihui He, Shiqiang Hao, Liubing Fan, Kunjie Liu, Chuxin Cai, Christopher Wolverton, Jing Zhao, Quanlin Liu 2300218 First Published: 27 April 2023 Description unavailable Five 0D Zn-based hybrid halides are synthesized with aromatic organic cations C6H5CH2NH3+ (PMA+) and C6H5(CH2)4NH3+ (PBA+). (PMA)2ZnCl4 exhibits the highest photoluminescence quantum yield of 37.2% of reported Zn-based white-emission organic–inorganic metal halides. The emission spectrum of (PBA)2ZnI4 indicates a color rendering index of 98, which is the highest among single-component white-light-emitting phosphors. Abstract Full text PDF References Request permissions Polarization-Driven Ultrafast Optical Switching in TiS3 Nanoribbons via Anisotropic Hot Carrier Dynamics Sang Ho Suk, Sanghee Nah, Muhammad Sajjad, Sung Bok Seo, Jiacheng Song, Nirpendra Singh, Sangwan Sim 2300370 First Published: 28 April 2023 Description unavailable This study is the first demonstration of polarization-controlled ultrafast optical switching in TiS3 nanoribbons, a layered quasi-1D nanomaterial. Using transient absorption microscopy, highly anisotropic sub-picosecond switching at near-infrared is shown, controlled through both pump and probe polarizations. This operation originates from anisotropic hot carrier dynamics, offering a novel mechanism for polarization-driven ultrafast nanophotonic devices based on quasi-1D materials. Abstract Full text PDF References Request permissions Open Access Non-Centrosymmetric 2D Nb3SeI7 with High In-Plane Anisotropy and Optical Nonlinearity Jia-Peng Wang, Yu-Qiang Fang, Wen He, Quan Liu, Jie-Rui Fu, Xin-Yu Li, Yue Liu, Bo Gao, Liang Zhen, Cheng-Yan Xu, Fu-Qiang Huang, Alfred J. Meixner, Dai Zhang, Yang Li 2300031 First Published: 27 April 2023 Description unavailable A newly discovered 2D material Nb3SeI7, which exhibits second harmonic generation (SHG) and in-plane anisotropic electricity, is reported. Symmetry breaking of Nb3SeI7 induces an intense nonlinear optical response with a second-order susceptibility of 6.71 pm V−1 and a high anisotropic factor of photoresponsivity up to 4.6. These characteristics of Nb3SeI7 pave the way toward superior nonlinear optics devices and polarization detectors. Abstract Full text PDF References Request permissions Efficient, Ambient-Stable, All-Polymer Organic Photodetector for Machine Learning-Promoted Intelligent Monitoring of Indoor Plant Growth Bing-Huang Jiang, Di-Wen Lin, Ming-Neng Shiu, Yu-Wei Su, Tsung-Han Tsai, Pei-Hsun Tsai, Tien-Shou Shieh, Choon Kit Chan, Jong-Hong Lu, Chih-Ping Chen 2203129 First Published: 28 April 2023 Description unavailable An all-polymer photodetector is demonstrated for machine learning-promoted intelligent monitoring of indoor plant growth: an ultralow value of dark current (5.92 × 10−10 A cm−2), a high value of detectivity (2.98 × 1013 Jones, at 530 nm), and a wide linear dynamic range (138 dB) are measured at a reverse bias of −1 V. Abstract Full text PDF References Request permissions Gate-Tunable Photovoltaic Efficiency in Graphene-Sandwiched PdSe2 Photodetectors with Restrained Carrier Recombination Tianhong Chen, Long Xiao, Yuan Liu, Junzhuan Wang, Xinran Wang, Xiaomu Wang, Shancheng Yan, Yi Shi 2300167 First Published: 28 April 2023 Description unavailable The graphene-sandwiched structure limits the diffusion length to tens of nanometers to reduce the carrier recombination during diffusion. Due to the low-resistance contact of graphene/PdSe2, the Fermi level and carrier density of PdSe2 can be significantly tuned by gate voltage which leads to an enhancement of the built-in field and photovoltaic efficiency. Abstract Full text PDF References Request permissions Integration of Exciton Donor and Acceptor in a Blue-Emitting Molecule with Zero Radius of Intramolecular Energy Transfer Mechanism for Highly Efficient and Stable Fluorescent OLEDs Bubae Park, Ki Ju Kim, Hyewon Nam, Bum Joon Park, Sunwoo Kang, Hyoung Yun Oh, Taekyung Kim 2300291 First Published: 28 April 2023 Description unavailable The integration of exciton donor and acceptor in a single emitting molecule with zero radius of intramolecular energy transfer (ZRIET) is proposed for efficient and stable organic light-emitting diodes. The blue-emitting nondoped device with ZRIET mechanism exhibits comparable efficiency and color purity as a conventional host–dopant emitting system and 220% enhancement in device lifetime. Abstract Full text PDF References Request permissions Open Access Primary and Secondary Reflective Color Realized by Full-Solution-Processed Multi-Layer Structures Wei-Jie Feng, Chengang Ji, L. Jay Guo 2300456 First Published: 28 April 2023 Description unavailable A full-solution-processed method is developed toward metal–dielectric–metal (MDM) structural color fabrication on various substrates, offering reduced cost as compared to vacuum-based deposition technologies. A Cu/SiO2 (or TiO2)/Cu tri-layer structure is obtained to demonstrate both primary and secondary colors through well controlled electroless deposition and sol–gel chemistry. Abstract Full text PDF References Request permissions Open Access Silicon Microspheres for Super-Planckian Light Sources in the Mid Infrared Roberto Fenollosa, Fernando Ramiro-Manzano, Moises Garín, Francisco Meseguer 2300135 First Published: 28 April 2023 Description unavailable The thermal emission of silicon microspheres has been measured in the mid-infrared. It consists of well-defined peaks associated to low-order Mie resonances. They have a large free spectral range and can emit light above the Planck limit because they have an optical cross-section larger than their geometric one. Abstract Full text PDF References Request permissions Trap-Dependent Optical/Thermal Stimulated Luminescence of Gallate Phosphors Charged by UV–visible–NIR light for Multiplexed Data Storage Dangli Gao, Zhigang Wang, Qing Pang, Qingqing Kuang, Feng Gao, Xiangyu Zhang, Sining Yun, Xiaojun Wang 2300303 First Published: 28 April 2023 Description unavailable ZnGa2O4 (ZGO):Mn,Cr phosphor exhibits an extremely sensitive optical/thermal stimulated luminescence with red and green double-peak feature. Interestingly, the red and green persistent luminescence exhibits the opposite temperature dependence. Moreover, this ZGO:Mn2+/Cr3+ phosphor can be conveniently, effectively, and repeatedly charged by UV–visible–NIR light via filling trap with either one photon or two photons by down/upconverted process. The red-green wavelength multiplexing signal storage is demonstrated. Abstract Full text PDF References Request permissions Tetraphenylethene-Based Multicomponent Platinum (II) Metallacages with Tunable Luminescence and Aggregation-Induced Electrochemiluminescence Properties Yu Wang, Jiani Liu, Yibo Niu, Linli He, Yujie Wang, Ying Ma, Yao Yao, Jianshan Ye 2202940 First Published: 28 April 2023 Description unavailable A series of tetraphenylethene-based multicomponent platinum(II) metallacages (MCs) with tunable sizes are synthesized to demonstrate the size-dependent fluorescence (FL) and electrochemiluminescence (ECL) properties. The aggregation-induced ECL (AIECL) behavior of MCs is reported, and the self-catalytic ECL-enhanced mechanism is proposed. An ECL sensor toward I− is developed according to a self-destruction mechanism. Abstract Full text PDF References Request permissions Open Access Hydrogel Lasers Via Supramolecular Host–Guest Complexation Matias Paatelainen, Markus Lahikainen, Alex Berdin, Kim Kuntze, Werner M. Nau, Nonappa, Arri Priimagi 2300232 First Published: 01 May 2023 Description unavailable A host–guest complex between Rhodamine B laser dye and cucrbit[7]uril is integrated into poly(N-isopropylacrylamide)-based hydrogel. Encapsulation of dye molecules within the hydrogel results in increased photostability and emission efficiency. Based on this, a tunable thin-film laser with improved performance is developed, directing the outlook towards responsive lab-on-chip photonic devices capable of interacting with the environment. Abstract Full text PDF References Request permissions Raman Spectroscopy of the Trapezoidal Bi2O2Se Mengwei Han, Shengqiang Wu, Xiaoxu Zhao, Qinming He, Bangmin Zhang, Weiming Xiong, Xin Luo, Yue Zheng 2300344 First Published: 01 May 2023 Description unavailable Substrate engineering is used to grow an unexplored trapezoidal Bi2O2Se, which facilitates the observation of four theoretically predicted Raman active phonon modes. The strong thermal anisotropy is found in the top and edge planes of trapezoidal Bi2O2Se, as revealed by the temperature-dependent and angle-resolved polarized Raman spectroscopy. Abstract Full text PDF References Request permissions The Simpler, the Better: Organic Materials with Adsorption-Induced Room-Temperature Phosphorescence for Anti-Counterfeiting and Dyeing Applications Zhenjiang Liu, Dan Li, Lihuan Tong, Yunshu Meng, Manman Fang, Jie Yang, Ben Zhong Tang, Zhen Li 2203069 First Published: 02 May 2023 Description unavailable Practical application prospect of organic room-temperature phosphorescence: simple, economical, and environmentally friendly. One dollar's worth of the phosphor can be used for anti-counterfeiting 7692 banknotes, printing and dyeing 1538 graphs on cloth, making 196 Chinese knots, and producing 385 writes of encryption information. Abstract Full text PDF References Request permissions Multiwavelength Achromatic Metalens in Visible by Inverse Design Qiang Jiang, Jianghong Liu, Junyi Li, Xiaoli Jing, Xin Li, Lingling Huang, Yongtian Wang 2300077 First Published: 01 May 2023 Description unavailable An efficient end-to-end inverse design framework for multiwavelength achromatic metalenses is implemented. Two linear polarization insensitive metalenses (numerical aperture of 0.3 and 0.61) operating at four visible wavelengths are experimentally demonstrated and designed respectively. The proposed strategy avoids complicated physical models, enabling the integration of complex functionalities into a single metasurface. Abstract Full text PDF References Request permissions Open Access Optically-Boosted Planar IBC Solar Cells with Electrically-Harmless Photonic Nanocoatings Ivan M. Santos, Miguel Alexandre, Valentin D. Mihailetchi, José A. Silva, Tiago Mateus, Ana Mouquinho, Jenny Boane, António T. Vicente, Daniela Nunes, Ugur D. Menda, Hugo Águas, Elvira Fortunato, Rodrigo Martins, Manuel J. Mendes 2300276 First Published: 01 May 2023 Description unavailable Electrically harmless photonic nanostructured coatings are an attractive light-trapping scheme for crystalline-silicon solar cells, alternatively to standard electrically-harmful surface texturing processes, as these allow unmatched optical gains plus angular acceptance. The proposed solution can be implemented as a post-process on the front side of completed devices via a highly-scalable colloidal lithography method, enabling straightforward integration in the established photovoltaic industry. Abstract Full text PDF References Request permissions High-Efficiency and Narrow-Band Near-Ultraviolet Emitters with Low CIEy of 0.03 by Incorporating Extra Weak Charge Transfer Channel into Multi-Resonance Skeleton Xiang-Qin Gan, Zhen-Ming Ding, Deng-Hui Liu, Wei-Qiong Zheng, Bin Ma, Hu Zhang, Xiang Chang, Li Wang, Yu Liu, Xiugang Wu, Shi-Jian Su, Weiguo Zhu 2300195 First Published: 01 May 2023 Description unavailable Two novel near-ultraviolet (NUV) organic emitters are reported by incorporating extra charge-transfer (CT) channel into multi-resonance skeleton to activate hybridized local and CT emission. Both emitters exhibit high-efficiency narrow-band NUV emissions at 414 nm with a FWHM about 32 nm in their doped, solution-processed organic light-emitting diodes. The highest external quantum efficiency of 9.15% and a low CIEy of 0.034 are obtained. Abstract Full text PDF References Request permissions Near-Infrared I/II Nanophosphors with Cr3+/Ni2+ Energy Transfer for Bioimaging Aishwarya Satpathy, Wen-Tse Huang, Ming-Hsien Chan, Ting-Yi Su, Mikołaj Kamiński, Natalia Majewska, Sebastian Mahlik, Grzegorz Leniec, Sławomir M. Kaczmarek, Michael Hsiao, Ru-Shi Liu 2300321 First Published: 02 May 2023 Description unavailable A mesoporous silica nanoparticle (MSN) template is integrated with the ZnGa2O4 system co-doped with Cr3+ and Ni2+ (ZGO:Cr0.008,Ni0.004). The addition of Cr3+ helps increase the emission intensity of Ni2+ in the second near-infrared (NIR-II) region. The nanophosphor is injected directly into the mouse brain, and high penetration depth of the NIR-II signal improves brain vessel visibility for brain abnormalities detection. Abstract Full text PDF References Request permissions Open Access Identification and Quantification of Charge Transfer in CaAl2O4:Eu2+,Nd3+ Persistent Phosphor Jintao Kong, Andries Meijerink 2203004 First Published: 01 May 2023 Description unavailable A new strategy based on simple optical spectroscopy is proposed to identify and quantify the reversible charge transfer in the benchmark violet-emitting CaAl2O4:Eu2+,Nd3+ persistent phosphor. It is shown that over 10% of Eu2+ and Nd3+ are affected by the reversible charge transfer, which exceeds the previous estimates in other persistent phosphors. Abstract Full text PDF References Request permissions 1D Diisopropylammonium Lead Iodide Perovskite Shows Exceptional Optical Stability and Third-Order Nonlinearity Shabnum Maqbool, Ziyad Thekkayil, Pankaj Mandal 2202942 First Published: 01 May 2023 Description unavailable 1D diisopropylammonium lead iodide (DiapPbI3) single crystals show highly efficient resonance-enhanced third harmonic generation (THG) and amazing optical stability. The THG efficiency and laser induced damage threshold are an order of magnitude higher than the commercially available THG materials. Abstract Full text PDF