Article
Optics
Yuan Xie, Wansheng Liu, Wanyuan Deng, Haimei Wu, Weiping Wang, Yichuan Si, Xiaowei Zhan, Chao Gao, Xian-Kai Chen, Hongbin Wu, Junbiao Peng, Yong Cao
Summary: This study reports on the potential applications of high-efficiency organic light-emitting diodes (OLEG) in the short-wavelength infrared (SWIR) region. By using specific types of molecules, researchers have successfully fabricated high radiance SWIR OLEGs, which have various applications in biosensors, biomedical imaging and spectroscopy, and surveillance.
Article
Multidisciplinary Sciences
Yoshinobu Matsuda, Ryunosuke Umemoto, Mitsuru Funato, Yoichi Kawakami
Summary: A platform for integrating multiple emission wavelengths on a single chip using epitaxial growth and three-dimensional design is presented. This approach overcomes the challenges of phosphor-related issues and complex assembly processes, allowing for flexible spectral control and monolithic integration of different emission colors.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Yang Mei, Yan-hui Chen, Lei-ying Ying, Ai-qin Tian, Guo-en Weng, Long Hao, Jian-ping Liu, Bao-ping Zhang
Summary: Dual-wavelength switchable emission has been achieved in InGaN QD micro-cavity light-emitting diodes. By modulating the injected current levels, the device can switch between two distinct cavity modes in the green spectral range. The microcavity effect enables high spectral purity. This study provides important guidelines for controllable dual-wavelength switchable operation in nitride-based light-emitting devices.
Article
Chemistry, Multidisciplinary
Xiangyu Fu, Yash Mehta, Yi-An Chen, Lei Lei, Liping Zhu, Nilesh Barange, Qi Dong, Shichen Yin, Juliana Mendes, Siliang He, Renuka Gogusetti, Chih-Hao Chang, Franky So
Summary: The study demonstrates highly directional and polarized light emission from LEDs by selectively diffracting the TE waveguide mode, showing potential for more efficient photonic applications.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Zhongming Luo, Baoxing Liu, Xi Luo, Ting Zheng, Sunbin Deng, Rongsheng Chen, Bingbing Tian, Ping Xu, Hoi-Sing Kwok, Guijun Li
Summary: The generic protocol for rational control of the nucleation and crystallization process of perovskite emission layer leads to highly reproducible manufacturing of high-performance PLEDs, showcasing the importance of rationally controlling the antisolvent process for future development. This methodology provides significant progress towards practical applications of highly reproducible PLEDs.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Yanzhu Liu, Zhonglin Zhang, Zhixin Wei, Zhiying Zhong, Shiwen Liu, Yi Yang, Xiaojun Zeng
Summary: This study presents an environmentally friendly approach for thiolation and trifluoromethylthiolation of Hantzsch esters. The generation of alkyl radicals without the need for photocatalysts is achieved through modification of chromophores and wavelength of light in alkyl dihydropyridines. The strategy also demonstrates broad substrate scope and high tolerance towards functional groups.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Jin-Hoon Kim, Jin-Woo Park
Summary: An intrinsically stretchable organic light-emitting diode, made of highly stretchable constituent materials, is able to emit light under strains as large as 80%. It has a low turn-on voltage of 8 V and a maximum luminance of 4400 cd m(-2) from both the anode and cathode sides. The device can withstand repeated stretching cycles up to 200 times and shows improved light-emitting efficiency with small stretches up to 50%.
Article
Materials Science, Multidisciplinary
Joan Rafols-Ribe, Eduardo Gracia-Espino, Sandra Jenatsch, Petter Lundberg, Andreas Sandstrom, Shi Tang, Christian Larsen, Ludvig Edman
Summary: This study compared the performance of OLEDs and LECs under varying device temperatures and found that the temperature dependency differs between the two devices, with LECs being more affected by temperature changes. The deviation in behavior is attributed to the stronger positive temperature dependence of hole mobility compared to electrons in both OLEDs and LECs, leading to a shift in the emission zone towards the center of the active material.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Guanwei Sun, Xinyan Liu, Zhe Liu, Denghui Liu, Fanyuan Meng, Zhenchao Li, Linghao Chu, Weidong Qiu, Xiaomei Peng, Wentao Xie, Chenyang Shen, Jiting Chen, Hin-Lap Yip, Shi-Jian Su
Summary: The electronic structure of lead halide perovskites can be tuned through the composition and structure of the BX6 octahedron, affecting emission wavelength and photoluminescence properties. The addition of large A-site cations can lead to lattice expansion or octahedral tilting, resulting in spectral redshift or blueshift of emission peak for wavelength tuning. Excess cations can also passivate the perovskites, leading to improved quantum yield, PL lifetime, and recombination ratio, ultimately achieving a high-efficiency red perovskite light-emitting diode.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yong-Ho Ra, Cheul-Ro Lee
Summary: A new approach to reduce the size of photonic device chips is reported, utilizing a monolithic light reflector-nanowire LED system. Vertical cavity nanowire structure for surface-lighting emission is developed using selective area epitaxy, with the light reflection provided by Al metal reflector deposited by MBE technique. The approach shows significantly improved light efficiency at specific spectral wavelength, promising a new route for next-generation photonic and electronic devices.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Santanu Pradhan, Mariona Dalmases, Nima Taghipour, Biswajit Kundu, Gerasimos Konstantatos
Summary: Developing high performance, low-cost solid-state light emitters in the telecom wavelength bandwidth is crucial for infrared light-based communications. In this study, the authors report highly efficient SWIR CQD LEDs with a record EQE of 11.8%, which further increased to 18.6% by optimizing the optical out-coupling. The CQD LED also has an electrical bandwidth of 2 MHz, making it suitable for SWIR free-space optical transmission.
Article
Optics
Pushan Guha Roy, Sayantani Sen, Anirban Bhattacharyya
Summary: In this work, dual-wavelength UV-LEDs with two discrete emission peaks of comparable intensities were reported. The switching between the two peaks was achieved by changing the duty cycle of the pulsed-mode excitation. Unlike previous complex devices, our device layer-structure was similar to single-wavelength LEDs, and the unique properties were realized through specially designed AlGaN alloys. The molecular beam epitaxy (MBE) method, which can operate at wider growth-parameter ranges, was chosen for this work.
Article
Chemistry, Multidisciplinary
Bei Liu, Mochamad Januar, Jui-Ching Cheng, Koji Hatanaka, Hiroaki Misawa, Kou-Chen Liu
Summary: The article discusses the importance of matching the resonant wavelength of plasmonic nanoparticles with the emission band of organic materials for optimal plasmon-enhanced luminescence in OLEDs. It introduces a design strategy using AuxAg1-x alloy NPs to enable resonance tuning while preserving NP size. Bimetallic NPs, especially with x < 0.6, provide additional degrees of freedom for plasmon wavelength variation and offer benefits of higher scattering and more intense electric fields compared to monometallic NPs.
Article
Chemistry, Physical
Lianna Chen, Zhiyuan Qin, Shuming Chen
Summary: In this study, a new method has been developed to achieve high-resolution pixelated emission by controlling the thickness of transparent electrodes, resulting in a color-converting cavity that can selectively convert unpatterned quantum-dot white emission into saturated red, green, and blue emission. This method enables ultrahigh density red, green, and blue emission with a resolution of approximately 1700 pixels per inch, as well as achieving a color gamut of 111% NTSC.
Article
Optics
Bin Tang, Liyan Gong, Hongpo Hu, Haiding Sun, Shengjun Zhou
Summary: The study introduces a hybrid nucleation layer approach to enhance the efficiency of III-nitride emitters in the green-to-amber region, leading to improved light output power and internal quantum efficiency. The hybrid nucleation layer induces a stacking fault band structure and reduces dislocation density and in-plane compressive stress in InGaN/GaN multiple quantum wells, resulting in significantly enhanced LED performance.