Volume 10, Issue 16
August 18, 2022
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High-Performance Inverted Tandem OLEDs with the Charge Generation Layer based on MoOx and Ag Doped Planar Heterojunction (Advanced Optical Materials 16/2022)
Yachen Xu, Yixiao Niu, Chunliu Gong, Wei Shi, Xuyong Yang, Bin Wei, Wai-Yeung Wong
2270061 First Published: 18 August 2022
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A high-performance inverted tandem organic light-emitting diode (OLED) based on a charge generation layer integrated with MoOx− and Ag-doped planar heterojunction is reported by Wei Shi, Bin Wei, Wai-Yeung Wong and co-workers in article number 2200984. The charge injection layer enhances the concentration of the charge carrier and balances the charge injection. The work provides a simple strategy to fabricate inverted tandem OLEDs with high performance.

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Inside Front Cover
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Flexible and Transferable Silver Nanowire Liquid Crystal Polymer Film Obtained via Photo-Alignment Programming (Advanced Optical Materials 16/2022)
Jingxin Sang, Juan Zhang, Hange Feng, Jiatong Sun, Jianhua Shang, Yihong Zhang, Shuguang Zhao, Kristiaan Neyts, Vladimir Chigrinov
2270062 First Published: 18 August 2022
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A non-contact photo-alignment technology was proposed to align silver nanowires (AgNWs) in a liquid crystal polymer (LCP) film with high order parameter. They are controlled to have planar alignment and twisted nematic structures in micro-multi-domains. The aligned AgNWs can be used to improve the mechanical properties of LCP films. The AgNW/LCP film can be programmed by micro-multi-domain photo-alignment for use in flexible and wearable devices. For further details see article number 2200950 by Jiatong Sun and co-workers.

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Metasurface-Assisted Optical Encryption Carrying Camouflaged Information (Advanced Optical Materials 16/2022)
Juan Deng, Zile Li, Jiaxin Li, Zhou Zhou, Fan Gao, Chenghao Qiu, Bo Yan
2270064 First Published: 18 August 2022
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A novel optical encryption scheme based on single-sized nanostructures storing multiple meta-images into different encryption levels is originally proposed and realized by Juan Deng, Bo Yan, and co-workers, as shown in article number 2200949. By introducing a camouflage strategy into Malus metasurfaces, this research ensures that even if the camouflage information is decrypted, the real information is still safe. The simple structure, high security, and scalability endow the metasurface with great potential in encryption applications and provide new insights for other related fields.

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Masthead: (Advanced Optical Materials 16/2022)
2270063 First Published: 18 August 2022
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Reviews
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Recent Patterning Methods for Halide Perovskite Nanoparticles
Jeong Woo Han, Seung Hwan Hwang, Myeong Jin Seol, Soo Young Kim
2200534 First Published: 22 June 2022
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Halide perovskites emerge as attractive materials because of their superior optoelectrical properties. However, due to the instability of perovskites, it is very difficult to pattern perovskites using common photolithography methods. In this article, research into perovskite patterning methods that do not use conventional photolithography is reviewed, and a roadmap for direct optical perovskite patterning research is suggested.

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Research Articles
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Chirality Induced Crystal Structural Difference in Metal Halide Composites
Weidong Cai, Jiajun Qin, Tiqiang Pang, Xinyi Cai, Renxu Jia, Feng Gao
2102140 First Published: 27 May 2022
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Significant crystallization difference between resulting racemic and chiral lead-free composites is observed by incorporating chiral MBABr (bromide methylbenzylamine) into the inorganic frame. In addition, in the chiral composites, structural transformation can be induced by moisture. Both effects are ascribed to the asymmetric hydrogen-bonding of organic components in chiral materials.

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Dual-Stimulus Supramolecular Luminescent Switch Based on Cyanostilbene-Bridged Bis(Dibenzo-24-Crown-8) and a Diarylethene Derivative
Jia-Xin Han, Xian-Yin Dai, Hui-Juan Wang, Heng-Yi Zhang, Yu Liu
2102390 First Published: 28 May 2022
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A photo-switched supramolecular luminescent assembly is constructed, showing both aggregation-induced emission and photo/chemical dual responsive properties. Such orthogonal stimulations allow for photo-induced fluorescence on/off and locking/unlocking information by base/acid treatment, with apparent fluorescent self-feedback. This study realizes the rarely reported but very important locking/unlocking information of photo-controlled fluorescence and self-feedback functions, providing a promising step for multifunctional intelligent supramolecular luminescent devices.

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Electric-Tunable Photoluminescence of 2D ErOCl for High-Security Encryption of Programmable Information
Ping Chen, Dongyan Li, Zexin Li, Lejing Pi, Xiang Xu, Haoyun Wang, Xing Zhou, Tianyou Zhai
2102562 First Published: 29 May 2022
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This work reports the programmable information encryption by 2D van der Waals rare-earth material ErOCl based on the editable electric-tunable photoluminescence (PL). The correct information encoded in PL outputs can be tactfully decrypted from the PL intensity ratio of two thermal coupling transitions (2H11/2–4I15/2 and 4S3/2–4I15/2), which has been applied to ASCII codes and images encryption with high-security.

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BaSi7P10 and SrSi7P10: Two Infrared Nonlinear Optical Phosphides with T2 Supertetrahedra Exhibiting Strong Second-Harmonic Generation Effects
Xin Zhao, Chensheng Lin, Jindong Chen, Feng Xu, Shunda Yang, Guang Peng, Haotian Tian, Yinglei Han, Bingxuan Li, Min Luo, Ning Ye
2200045 First Published: 05 June 2022
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Two phosphide-based infrared nonlinear crystals, BaSi7P10 and SrSi7P10, have a 3D framework similar to BaGa4Se7 with 1D zigzig chains constructed from dual-T2 supertetrahedra, which leads to the paralleled arrangement of [SiP4] tetrahedra. Both of these two compounds exhibit strong second-harmonic generation effects, large birefringences, and wide infrared transparency.

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Crystal Prediction and Design of Tunable Light Emission in BTB-Based Metal-Organic Frameworks
Jessica M. Rimsza, Susan E. Henkelis, Lauren E. S. Rohwer, Dorina F. Sava Gallis, Tina M. Nenoff
2200058 First Published: 12 June 2022
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A material design framework is used to elucidate mechanisms of emission in interpenetrated metal-organic frameworks (MOFs) structures. Computational modeling, validated by experiments, identifies that the emission intensity and wavelength are controlled by the number of stacked linkers and their spacings. Similar design frameworks can be used to design MOFs with specific wavelength emission based on their structure.

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Self-Rolling SiO2/Au Based Epsilon-Near-Zero Metamaterials
Mohsin Habib, Ibrahim Issah, Esteban Bermúdez-Ureña, Humeyra Caglayan
2200081 First Published: 31 May 2022
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Wave propagation in epsilon-near-zero (ENZ) media offers exciting possibilities for both fundamental and disruptive applications. In this work, a thin film self-rolling technique to fabricate SiO2/Au based rolled-up tubes is implemented. These cylindrical multilayer metamaterials are employed as self-rolling ENZ metamaterials at the visible to near-infrared wavelength range by utilizing the material dispersion as well as the structural dispersion.

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Distinctive Photo-Induced Memory Effect in Heterostructure of 2D Van Der Waals Materials and Lanthanum Aluminate
Tuan Khanh Chau, Thanh Luan Phan, Nahee Park, Junhong Na, Dongseok Suh
2200124 First Published: 12 June 2022
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Mixed-dimensional van der Waals (vdW) heterostructures based on molybdenum disulfide and lanthanum aluminate are used to realize an optoelectronic memory boasting a distinctive persistent photocurrent phenomenon. These findings provide useful guidelines how to configure next-generation optoelectronic devices, and how to analyze extraordinary optoelectronic properties of the two-dimensional vdW materials and functional oxides, not only separately, but also synergistically.

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Improved Efficiency of Light-Emitting Diodes by Plasmonic Nanopatterning of the Charge-Transfer Layer
Lyuye Lin, Roman Krahne, Remo Proietti Zaccaria
2200156 First Published: 27 May 2022
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Nano-patterning solutions can be exploited for improving the performance of light-emitting diodes (LEDs). Here, the electron-transport layer is modified according to this strategy resulting in the LED external quantum efficiency enhancement over two times higher than the unpatterned corresponding structure. The analysis is performed by considering both the Purcell factor and the outcoupling efficiency.

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Encapsulation of AIEgens within Metal–Organic Framework toward High-Performance White Light-Emitting Diodes
Yang Yang, Wenliang Li, Chunyi Sun, Guogang Shan, Chao Qin, Kuizhan Shao, Jianguo Wang, Zhongmin Su
2200174 First Published: 28 May 2022
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A simple and feasible strategy to achieve high-performance white light-emitting diodes is proposed by encapsulating aggregation-induced emission luminogens (AIEgens) into the channel of metal–organic frameworks (MOFs). Accordingly, a single-phase MOF composite with the CIE chromaticity coordinates of (0.35,0.34) and an excellent quantum efficiency of 64.9% is demonstrated.

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High Refractive Index Chalcogenide Hybrid Inorganic/Organic Polymers for Integrated Photonics
Abhinav Nishant, Kyung-Jo Kim, Sasaan A. Showghi, Roland Himmelhuber, Tristan S. Kleine, Taeheon Lee, Jeffrey Pyun, Robert A. Norwood
2200176 First Published: 29 May 2022
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The fabrication of photonic devices from high refractive index polymers remains an important emerging area for the creation of next-generation low cost devices. The authors report on the first fabrication of polymer waveguides, Y junction splitters, and ring resonators using a new class of high refractive index polymers, chalcogenide hybrid inorganic/organic polymers.

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Dynamic Interference Colors in Electrospun Microfibrous Mats
Matthew D. Thum, Jakub Kołacz, Daniel C. Ratchford, Gerald Camarella, William Maza, Jeffrey G. Lundin
2200192 First Published: 04 June 2022
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A dynamic, multi-stimuli-responsive, color-changing system is described wherein precise control over the fiber diameter in electrospun microfibers with a liquid crystal core and a polymer sheath results in microfibers, and microfibrous mats, with brilliant interference colors which are responsive to temperature, and UV–vis irradiation with the addition of a photochromic surfactant into the polymer sheath.

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Single-Layer Sheets of Alkylammonium Lead Iodide Perovskites with Tunable and Stable Green Emission for White Light-Emitting Devices
Chuying Wang, Ya-Kun Wang, Ziliang Li, Jingwei Luo, Randy Sabatini, Tao Zhang, Edward H. Sargent, Zhengtao Deng
2200217 First Published: 29 May 2022
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Single-layer sheets of alkylammonium lead iodide, (RNH3)2PbI4 (R = C18H35–, C12H25–, and C8H17–), with narrow emission tuning across the green are synthesized by a quantum dot-initiated self-assembly—one based on a judicious choice of appropriate alkylamines and alkyl acids. The green-emitting single-layer sheet is compatible with red-emitting CsPbI3 quantum dots in white light-emitting diodes, preventing the undesired peak migration.

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Cis-Trans Isomerism Inducing Cocrystal Polymorphism with Thermally Activated Delayed Fluorescence and Two-Photon Absorption
Xiangyu Zhang, Jianbo De, Haichao Liu, Qing Liao, Shi-Tong Zhang, Changjiang Zhou, Hongbing Fu, Bing Yang
2200286 First Published: 29 May 2022
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Cis-trans isomerism of donor induces two polymorphism cocrystals and determines their distinct photophysical properties. PCNTC-R with pyrene (Py) dimer as donor exhibits red thermally activated delayed fluorescence (TADF) while PCNTC-O with Py monomer as donor presents orange-yellow normal fluorescence. PCNTC-R becomes a rare cocrystal reported to simultaneously possess TADF and two-photon absorption (TPA) properties, providing a strategy for multi-functional cocrystalline materials.

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Nonlinear Infrared Photodetection Based on Strong Nondegenerate Two-Photon Absorption of Perovskite Single Crystal
Wei Wang, Qi Wei, Yiyang Gong, Guichuan Xing, Bo Wu, Guofu Zhou
2200400 First Published: 29 May 2022
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The nondegenerate two-photon absorption of MAPbBr3 single crystal is studied using pump–probe spectroscopy. It is shown that the nondegenerate two-photon absorption coefficient can reach as large as 51.3 cm GW−1, which enables the development of a high-sensitivity nonlinear infrared pulse photodetector with a responsivity of 68 V W−1 for 1700 nm infrared pulse.

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Computational Discovery and Experimental Demonstration of Boron Phosphide Ultraviolet Nanoresonators
Mark K. Svendsen, Hiroshi Sugimoto, Artyom Assadillayev, Daisuke Shima, Minoru Fujii, Kristian S. Thygesen, Søren Raza
2200422 First Published: 29 May 2022
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High-throughput computational screening of more than a thousand materials identifies boron phosphide (BP) as one of the most promising material for Mie-resonant high-refractive-index nanoantennas operating in the visible and ultraviolet. Dark-field and electron energy-loss spectroscopy measurements on BP nanoparticles demonstrate size-dependent Mie resonances.

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Phonon Analysis of 2D Organic-Halide Perovskites in the Low- and Mid-IR Region
Yan-Fang Chen, Arup Mahata, Aura D. Lubio, Marco Cinquino, Annalisa Coriolano, Lilian Skokan, Young-Gyun Jeong, Luca Razzari, Luisa De Marco, Andreas Ruediger, Filippo De Angelis, Silvia Colella, Emanuele Orgiu
2100439 First Published: 16 June 2022
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The vibrational signatures of four different 2D Ruddlesden–Popper perovskites are analyzed by collecting experimental Raman spectra. So-far unreported experimental Raman peaks in the 600–1100 cm−1 range are found and discussed. This work paves the way for a better design of novel compounds as well as for their exploitation in (opto)electronic applications.

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Two-Color Strip-Patterned White OLEDs: Tunable Color-Temperature via Pattern Dimension Control
Dongheon Han, Myeongjae Lee, Wooik Jang, Seunghan Lee, Jeehye Yang, Hyunwoo Jo, Hojin Lee, Kyungwon Kwak, BongSoo Kim, Moon Sung Kang
2200456 First Published: 03 June 2022
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White organic light-emitting diodes with two-color strip-patterns are fabricated through solution processes. The formation of the two-color patterns is facilitated using the crosslinkers permitting the construction of orange strip patterns and the contrast in the surface energy allowing selective wetting of the sky-blue patterns. Warm-to-cold white light control is realized by varying the areal ratio of the two-color strip-patterns.

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Plasmonic Polycrystals within Microbowl Arrays
Hong Liu, Chao Xu, Qianqian Ding, Chenglong Zhao, Xiangheng Xiao, Shikuan Yang
2200467 First Published: 27 May 2022
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Polycrystals demonstrate different physical and chemical properties from the crystals and the amorphous materials. Here, fabrication of plasmonic polycrystals formed by “artificial atoms” (e.g., gold nanoparticles) through a self-assembled bowl-in-bowl template-confined dewetting process of a thin gold film is demonstrated. The plasmonic polycrystals demonstrate interesting plasmonic properties arising from the lattice and individual nanoparticles.

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Study of Photocarriers Lifetime Distribution in a-Si:H via Magneto-photoconductivity and Magneto-Photoluminescence
Ryan McLaughlin, Xin Pan, Dali Sun, Ohyun Kwon, Zeev Valy Vardeny
2200499 First Published: 29 May 2022
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The magneto-photoluminescence (MPL) and magneto-photoconductivity (MPC) in amorphous hydrogenated silicon (a-Si:H) films and devices are investigated. The disorder in a-Si:H films leads to dispersive field responses described by a dispersive parameter α < 1, from which the electron–hole lifetime distribution is obtained. Prolonged illumination increases photocarriers localization which enhances the hyperfine interaction; these effects are partially restored upon annealing.

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High-Efficiency and Narrowband OLEDs from Blue to Yellow with Ternary Boron/Nitrogen-Based Polycyclic Heteroaromatic Emitters
Xu-Feng Luo, Hua-Xiu Ni, An-Qi Lv, Xiao-Kang Yao, Hui-Li Ma, You-Xuan Zheng
2200504 First Published: 29 May 2022
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Four ternary boron/nitrogen-based polycyclic heteroaromatic emitters via B-π-B and B-π-C, two design types to modulate the size of the π-core, show small ∆EST, high kr and kRISC values with FWHMs of 24, 27, 20, and 28 nm, respectively. The color-tuning organic light-emitting diodes display high external quantum efficiencies of 13.7%, 17.6%, 26.7%, and 21.8%, respectively, which cover from blue to yellow electroluminescence.

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Donor–Acceptor–Donor “Hot Exciton” Triads for High Reverse Intersystem Crossing in OLEDs
Yanan Zhu, Sergi Vela, Hong Meng, Clémence Corminboeuf, Maria Fumanal
2200509 First Published: 26 May 2022
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Molecular design of donor–acceptor–donor triads for high reverse intersystem crossing (hRISC) is discussed considering the frontier molecular orbitals, the exciton coupling model, and high-throughput computational screening. The latter is shown to be optimal to identify hot exciton hRISC candidates from a diverse dataset of 234 systems. Analysis of their hybrid local and charge transfer character is performed.

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