Article
Nanoscience & Nanotechnology
Natsuko Urushihara, Tadahiko Hirai, Akansha Dager, Yuta Nakamura, Yuma Nishi, Ken Inoue, Ryo Suzuki, Makoto Tanimura, Kazuteru Shinozaki, Masaru Tachibana
Summary: Natural product-derived carbon dots have successfully achieved electroluminescence, showing great potential for applications in LEDs.
ACS APPLIED NANO MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Karolis Leitonas, Matas Guzauskas, Uliana Tsiko, Jurate Simokaitiene, Dmytro Volyniuk, Juozas Vidas Grazulevicius
Summary: This study aimed to develop white organic light-emitting transistors using a vertical device structure on a permeable base. By utilizing a newly synthesized blue emitter, white electroluminescence was achieved in the transistors.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Jianfeng Zhang, Lin Wang, Xiaoyu Zhang, Guohua Xie, Guohua Jia, Jianhua Zhang, Xuyong Yang
Summary: Metal halide perovskites have been widely used in optoelectronic devices, with green, red, and near-infrared PeLEDs achieving high external quantum efficiencies. However, blue PeLEDs face challenges such as low quantum yields, emission spectrum instability, and difficulties in charge injection. Research is ongoing to improve the efficiency of blue PeLEDs and address these challenges.
Article
Physics, Applied
Wenhui Wu, Tianyuan Liang, Huaxin Wu, Baolu Fan, Yumeng Zhang, Jiyang Fan
Summary: Inorganic lead halide perovskite nanowires are studied as emission layers in LEDs, forming crystallographic orientation-consistent arrays. At high nanowire concentration, pure green light is emitted with carriers transporting through FN quantum tunneling and direct injection; at lower concentration, the luminescence shifts from green to white with increasing bias. These results enhance understanding of perovskite nanowire-based LEDs' characteristics.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Kai Chen, Liang Zhou, Xuesen Zhao, Qi Zhu, Ruixia Wu, Xiaokang Li, Zhipeng Wei
Summary: By employing a fluorescent guest material with matched energy level and optimizing the device structure and layer thickness, a high performance deep-blue electroluminescent device was successfully prepared, achieving improved color purity and enhanced luminescent efficiency.
Article
Optics
Haiyan Zhao, Tongtong Xuan, Wenhao Bai, Haorui Dong, Guoyan Dong, Rong-Jun Xie
Summary: In this study, sky-blue DJ perovskites were synthesized using an organic diamine and high-quality perovskite films were prepared by incorporating a polymer as an additive. The resulting PeLEDs exhibited a high external quantum efficiency of 16.55%.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Bizheng Dong, Zemei Liu, Jiakui Yan, Yabo Xu, Guozheng Li, Bo Zhao
Summary: In this study, a highly efficient red exciplex with an emission peak of -600 nm and a maximum EQE of 5.7% was realized by applying Ir(ppy)3. Then, a series of all-exciplex emission white organic light emitting diodes (WOLEDs) were achieved by combining red exciplex of Ir(ppy)3:PO-T2T and blue exciplex of mCP:PO-T2T. The all-exciplex WOLEDs could maintain a high CRI (>80) value under different voltages, and the highest CRI reached 93. The broad emission bands of red/blue exciplex, efficient triplet exciton harvest, and elaborately spectral modulation are responsible for the high CRI and efficiency of all-exciplex WOLEDs.
Review
Optics
Shi-Jie Zou, Xin-Yi Zeng, Yan-Qing Li, Jian-Xin Tang
Summary: WOLEDs, especially SEL-WOLEDs, are considered promising candidates for full-color display and solid-state lighting due to their high efficiency, white color balance, simple fabrication, and large-area manufacturing possibilities. Recent strategies focus on molecular design, energy transfer mechanisms, and combining different emitters to improve device performance in SEL-WOLEDs. Future prospects and technological challenges of SEL-WOLEDs are also discussed.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Archana Puthanveedu, Shanmugasundaram Kanagaraj, Amutha Anjali Bai, Sunesh Chozhidakath Damodharan, Youngson Choe
Summary: Solid-state LEC is advantageous due to its simple structure, easy fabrication process, and compatibility with air-stable electrodes. In this design strategy, an electron-rich triphe-nylamine was combined with thenil imidazole and phenanthroimidazole to construct an active material for non-doped LECs. The findings showed the potential of LECs as low-cost light sources with bright blue emissions.
ORGANIC ELECTRONICS
(2023)
Article
Optics
Yunzhou Deng, Feng Peng, Yao Lu, Xitong Zhu, Wangxiao Jin, Jing Qiu, Jiawei Dong, Yanlei Hao, Dawei Di, Yuan Gao, Tulai Sun, Ming Zhang, Feng Liu, Linjun Wang, Lei Ying, Fei Huang, Yizheng Jin
Summary: This study demonstrates high quantum efficiency and excellent stability of green and blue QD-LEDs. By using hole-transport polymers with low electron affinity and reduced energetic disorder, electron leakage at the organic/inorganic interface is successfully eliminated. This research is expected to provide a general strategy for eliminating charge leakage in solution-processed LEDs featuring organic/inorganic interfaces.
Article
Chemistry, Physical
Sihang Ji, Xi Yuan, Jinju Zheng, Sheng Cao, Wenyu Ji, Haibo Li, Jialong Zhao, Hanzhuang Zhang
Summary: Tunable dual-color emitting Mn2+ doped CsPbCl3-xBrx nanocrystals with near-unity photoluminescence quantum yield were successfully synthesized through post-treatment of metal bromide for efficient warm white light-emitting diodes fabrication. The enhanced Mn2+ PL quantum yield was attributed to improved energy transfer and suppressed defect state density, resulting in stable Mn2+ PL emission and energy transfer efficiencies at different temperatures. High-efficiency warm white light-emitting diodes with a color rendering index of 90 and luminous efficacy of 92 lm/W were achieved by combining blue-orange dual-emitting Mn2+ doped CsPbCl(3)xBrx@SiO2 and green emissive CsPbBr3@SiO2 nanocrystals with violet GaN chips.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Dayu Huang, Pan Zheng, Ziyong Cheng, Qianqian Yang, Youchao Kong, Qiuyun Ouyang, Hongzhou Lian, Jun Lin
Summary: A hydrothermal method is used to synthesize two different single crystal materials with different shapes and phases. These materials can emit deep blue light and pure blue light. The difference in the distribution of Cl energy states is found to be the reason for the difference in luminescence properties.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Ceramics
Hanxiao Kong, Guang Jia, Huilin Li, Zhaoxin Meng, Ning Zhang, Cuimiao Zhang
Summary: A variety of Bi3+ and/or Eu3+ doped KBaYSi2O7 phosphors with different colors have been successfully synthesized. The Bi3+ doped phosphors show intense cyan emission or unique narrow deep blue emission, which can be used for WLEDs. By adjusting the doping concentrations of Bi3+ and Eu3+, the luminescence colors of KBaYSi2O7 can be tuned. The as-synthesized phosphors exhibit great potential for application in WLEDs and solid-state lighting.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Zhiheng Wang, Xiaoxian Song, Qishen Chen, Jie Liang, Zhengqian Tu, Chenhui Wang, Zuolun Zhang, Hai Bi, Yue Wang
Summary: Exciplex-forming cohosts with different recombination mechanisms, particularly trimolecular Langevin recombination, exhibit higher luminance lifetimes and better resistance to deterioration compared to trap-assisted recombination cohosts. Additionally, controlling exciton management in the recombination region can suppress luminous decline and undesirable exciton-exciton annihilations.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Qingjiang Ren, Yi Zhao, Chang Liu, Hongmei Zhan, Yanxiang Cheng, Wenlian Li
Summary: Highly efficient orange-red and white organic light-emitting diodes (OLEDs) are fabricated with different donor/acceptor ratios and doping concentrations for efficient triplet excitons harvest. The best performance is achieved with a 5:5 ratio exciplex host in orange-red OLEDs. Triplet exciton harvest through reverse intersystem crossing process and efficient energy transfer contribute to the high device efficiency.