Article
Engineering, Electrical & Electronic
Qixin Guo, Katsuhiko Saito, Tooru Tanaka
Summary: This article reviews the progress made in achieving color-tunable LEDs based on rare earth doped wide bandgap Ga2O3 semiconductors. The study found that rare earth doped Ga2O3 films can emit strong emissions in the red, green, and blue spectral regions respectively, and demonstrated the development of red, green, and blue LEDs based on these films. Color-tunable LEDs were achieved using Eu, Er, and Tm codoped Ga2O3 films.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Review
Physics, Multidisciplinary
Ziming Chen, Zhenchao Li, Thomas R. Hopper, Artem A. Bakulin, Hin-Lap Yip
Summary: The article provides a comprehensive review of the newly developed lighting technology based on metal halide perovskites, covering materials, photophysics, and device engineering. It focuses on the compositional engineering of perovskite structures, physics underlying photo- and electroluminescence, and strategies for boosting device performance in perovskite light-emitting diodes. Key concepts include balancing electron/hole injection, suppression of parasitic carrier losses, improvement of photoluminescence quantum yield, and enhancement of light extraction.
REPORTS ON PROGRESS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yi-Shan Lin, Han-Yu Tsai, Jung-Kuan Huang, Ching-Fuh Lin
Summary: In this study, rare-earth-element-free fluorescent films were produced using a solution method, with a thickness of 10 μm and high quantum yields for both the fluorescent solution and film. The type of solvent was found to affect the resonance position of the CN functional group in DCJTB, with its displacement decreasing with quantum yield. These findings contribute to reducing environmental hazards and improving the efficiency of fluorescent materials.
Article
Chemistry, Multidisciplinary
Yu Xia, Yon-Hui Lou, Yu-Hang Zhou, Yi-Ran Shi, Kai-Li Wang, Lei Cai, Chun-Hao Chen, Fan Hu, Zhao-Kui Wang, Liang-Sheng Liao
Summary: A novel defect-passivation strategy using isocyanate molecules is proposed to fabricate efficient sky-blue PeLEDs. The strategy reduces nonradiative recombination loss and improves carrier injection and transport capacities by reducing the confinement effect. The prepared sky-blue PeLEDs show significantly improved external quantum efficiency, and the isocyanate-based passivators are shown to be universal for improving PeLEDs performance.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Crystallography
Keke Song, Xiaoping Zou, Huiyin Zhang, Jin Cheng, Chunqian Zhang, Baoyu Liu, Xiaolan Wang, Xiaotong Li, Yifei Wang, Baokai Ren, Junming Li
Summary: This study proposes a strategy of adding different amounts of solvents to the perovskite precursor solution to optimize the morphology of perovskite films and improve device performance. The results show that with the decreasing concentration of the precursor solution, the perovskite film becomes smoother, enhancing the external quantum efficiency. This work is significant for achieving improved film morphology and device performance in perovskite optoelectronic devices.
Article
Chemistry, Multidisciplinary
Yong-Chun Ye, Yang Shen, Wei Zhou, Shi-Chi Feng, Jiang-Ying Wang, Yan-Qing Li, Jian-Xin Tang
Summary: Perovskite light-emitting diodes (PeLEDs) show promise for next-generation high-definition displays due to their excellent color purity and low power consumption. A novel strategy of interfacial molecule control is demonstrated using a bifunctional material to enhance interaction and exciton management between the perovskite and electron-transport layers. This modification layer not only passivates surface defects but also blocks interfacial exciton transfer, resulting in improved external quantum efficiencies for green, blue, and red emissions.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Nan Li, Yongheng Jia, Yuwei Guo, Ni Zhao
Summary: This paper systematically discusses ion-related issues in PeLEDs, including the material and processing origins of ion generation, the mechanisms driving ion migration, characterization approaches for probing ion distributions, the effects of ion migration on device performance and stability, and strategies for ion management. The remaining challenges and future opportunities in this field are highlighted.
ADVANCED MATERIALS
(2022)
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
Ming-Lei Guo, Yu Lu, Xiao-Yi Cai, Yang Shen, Xiao-Yan Qian, Hao Ren, Yan-Qing Li, Wen-Jun Wang, Jian-Xin Tang
Summary: A rational interface engineering method was proposed to enhance the interfacial crystallization and radiative recombination of perovskite films in order to achieve high-performance perovskite light-emitting diodes.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Yang Shen, Kong-Chao Shen, Yan-Qing Li, Minglei Guo, Jingkun Wang, Yongchun Ye, Feng-Ming Xie, Hao Ren, Xingyu Gao, Fei Song, Jian-Xin Tang
Summary: This research proposes a novel crystallization strategy and rational interfacial engineering to enhance deep-blue emission in perovskite grains, resulting in significantly improved device performance for PeLEDs.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Fanghao Ye, Huibo Yan, Siyang Liu, Baoxing Liu, Zhiqing Zhang, Mengyao Tian, Ting Zheng, Xi Lan, Jincheng Huang, Chunfeng Meng, Ping Xu, Guijun Li
Summary: This study finds that using quaternary ammonium-based ionic liquids as an interfacial modification layer in perovskite light-emitting diodes (PeLEDs) can significantly improve the device efficiency and stability. The interaction between quaternary ammonium ions and perovskite films improves the morphology and suppresses ion migration.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ge Mu, Tianyu Rao, Yawei Qi, Su Ma, Qun Hao, Menglu Chen, Xin Tang
Summary: An optoelectronic device called color-tunable organic light-emitting diode (CTOLED) is developed to achieve interactive signal visualization in the intelligent era. The device enables multicolor visualization of infrared light and temperature distribution through a multi-stimuli responsive silicon sensor. It offers the user the ability to manipulate the device using an infrared pen, influencing the displayed patterns and colors. Additionally, the device can sense temperature and display it in different colors, making it a promising wearable temperature visualization monitor.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yang Shen, Hai-Yan Wu, Yan-Qing Li, Kong-Chao Shen, Xingyu Gao, Fei Song, Jian-Xin Tang
Summary: This study introduces a simple device architecture to achieve efficient blue PeLEDs by manipulating perovskite crystallization nucleation at interfaces, leading to highly compact perovskite nanocrystal assemblies. This strategy significantly improves the external quantum efficiency (EQE) of blue PeLEDs and enhances operational stability.
ADVANCED FUNCTIONAL MATERIALS
(2021)
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
Chemistry, Multidisciplinary
Yang Shen, Jing-Kun Wang, Yan-Qing Li, Kong-Chao Shen, Zhen-Huang Su, Li Chen, Ming-Lei Guo, Xiao-Yi Cai, Feng-Ming Xie, Xiao-Yan Qian, Xingyu Gao, Ivan S. Zhidkov, Jian-Xin Tang
Summary: This study presents an interface engineering scheme using a multifunctional molecule APDO to manipulate the crystallization of perovskite films, resulting in improved radiative recombination and hole-transport capability for large-area blue perovskite light-emitting diodes. The interface engineering enabled sky-blue perovskite films with uniformity and low trap states, leading to enhanced device performance with peak external quantum efficiency of 9.2% for 100 mm^2 devices and up to 6.1% for 400 mm^2 devices.