Article
Chemistry, Multidisciplinary
Zishan Yan, Tong Chen, Lingpeng Yan, Xinghua Liu, Jingxia Zheng, Fu-de Ren, Yongzhen Yang, Bin Liu, Xuguang Liu, Bingshe Xu
Summary: White-light emitting carbon dots (WCDs) with high color rendering index (CRI) were prepared through a one-step solvothermal reaction. The WCDs emit white light by combining red, yellow, green, and blue lights. The high CRI value of 97 achieved in WLEDs using the WCDs as phosphors is among the highest reported. Additionally, multicolor LEDs can be fabricated using the four multicolor CDs as phosphors.
Article
Chemistry, Multidisciplinary
Zhuangzhuang Ma, Zhifeng Shi, Dongwen Yang, Yawen Li, Fei Zhang, Lintao Wang, Xu Chen, Di Wu, Yongtao Tian, Yu Zhang, Lijun Zhang, Xinjian Li, Chongxin Shan
Summary: This study introduces a two-component strategy using two broadband emissive materials with self-trapped excitons (STEs) to produce high CRI and stable WLEDs. By synthesizing copper-based ternary halides composites, the research demonstrates cold/warm tunable WLEDs with high CRI and excellent stability. These results highlight the potential of using hybrids of STEs-derived broadband emissive materials for high-performance WLEDs.
ADVANCED MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Junfei Liang, Tong Wu, Jun Chen
Summary: This study presents white-light polymer light-emitting diodes based on blue polymers PFSO10 and Poly-TPD. By utilizing incomplete energy transfer from blue polymers to low-energy exciplex, a white-light emission based on two high-energy blue polymers was achieved. Through optimizing the blended ratio of PFSO10 and Poly-TPD, a white-light emission with a color rendering index (CRI) of 49 and Commission Internationale de L'Eclairage (CIE) coordinates of (0.38, 0.41) was obtained.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yun Tang, Ben Liu, Nan Yan, Xiaoqiang He, Hudie Yuan, Yalou Xin, Hongfeng Yin
Summary: In this study, red-emitting MAPbBr(3-x)I(x) QDs-coated YAG:Ce (A-YAG@QDs) composites were successfully prepared to fabricate WLED with compensated red emission. The dispersion and sinking-related issues between QDs and YAG:Ce were effectively avoided through chemical coordination interactions. The resulting WLED exhibited warm white light with low CCT, high Ra, and high value of saturated red color component R9, making it suitable for indoor lighting applications.
Article
Chemistry, Inorganic & Nuclear
Mixue Wang, Xiaozhen Wei, Weixuan Zhang, Haocheng Zhao, Yuling Wu, Yanqin Miao, Hua Wang, Bingshe Xu
Summary: In this study, a series of hyperbranched white-emitting conjugated polymers were synthesized with improved thermal stability and film morphology by adjusting the feeding ratios of fluorene-containing POSSs. The fabricated devices using these polymers as light-emitting layers achieved white light emission with good electroluminescent performance, making them attractive candidates for sunlight-style white polymer light-emitting diodes.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Optics
Wei Li, Nan Ma, Balaji Devakumar, Xiaoyong Huang
Summary: This study presents a new efficient blue-light-excited Ce3+-doped CaY2HfScAl3O12 green phosphor with broad emission bandwidth and high quantum efficiency. The potential application of this phosphor in fabrication of full-spectrum LED lighting is demonstrated.
JOURNAL OF LUMINESCENCE
(2023)
Article
Optics
Mengna Yin, Xiaozhen Wei, Yanqin Miao, Di Zhang, Guoliang Wang, Huixia Xu, Hua Wang, Fei Chen
Summary: A novel and ultra-simple all fluorescent di-chromatic white organic light-emitting diodes (WOLEDs) with high color rendering index and color stability have been achieved by using only three non-doped organic layers. The emission spectra could be easily improved by changing the thickness of the charge adjusting layer.
JOURNAL OF LUMINESCENCE
(2021)
Article
Engineering, Electrical & Electronic
Luqiao Yin, Yuxian Yan, Huazhang Guo, Liang Wang, Huixin Xiu, Jianhua Zhang
Summary: The study focuses on the luminescence performance, thermal stability, and photo stability of solid-state CDs@BaSO4 phosphors, showing that they exhibit excellent luminescence and thermal stability when applied in white LEDs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Multidisciplinary
Zhangshan Liu, Jinke Chen, Letian Chen, Hao Liu, Dezhi Yang, Dongge Ma, Ben Zhong Tang, Zujin Zhao
Summary: A blue delayed fluorescence molecule (2PCz-XT) that can efficiently sensitize green, orange, and red phosphorescent emitters is developed. Hybrid white organic light-emitting diodes (WOLEDs) with high external quantum efficiency (26.8%), high color rendering index (83), and high device operational stability are realized by the ultra-thin design of the delayed fluorescence 2PCz-XT-sensitized phosphorescent layers.
Article
Chemistry, Multidisciplinary
Hao Liu, Yan Fu, Ben Zhong Tang, Zujin Zhao
Summary: By employing an interlayer sensitization strategy assisted by a thermally activated delayed fluorescence (TADF) electron-capturing agent, high-performance all-fluorescence white organic light-emitting diodes (WOLEDs) were successfully fabricated. The synergistic effect of TADF sensitizing layer and TADF electron-capturing agent resulted in improved exciton utilization, leading to high efficiencies, high color quality, and enhanced stability in efficiency and operation of the three-color all-fluorescence WOLEDs. These WOLEDs achieved remarkable external quantum efficiency, color rendering index, and long operational lifetime, showcasing the great potential of this proposed strategy.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Yun Tang, Xiaoqiang He, Yuchao Zhang, Hudie Yuan, Yalou Xin, Xiaohu Ren, Qiang Chen, Hongfeng Yin
Summary: The widespread application of YAG:Ce-based white light-emitting diodes (WLEDs) is facing challenges due to the lack of red emission. By implementing a one-pot anchoring strategy, the thermal and photo-stabilities of in-situ generated red-emitting MAPbBr(0.5)I(2.5) PNCs can be enhanced, and the uniform distribution of phosphor and PNCs in silicone can be achieved, resulting in warm white light.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Nonglin Zhou, Jingle Wang, Jia Huang, Shunyin Luo, Xiaona Shao
Summary: The use of organic blue-green emitting materials mixed with green and red phosphors in hybrid WLED devices can greatly improve the color rendering index (CRI) and reduce reliance on rare earth metals. This approach also inspires the design and synthesis of new blue-green materials for future development of hybrid WLEDs.
Article
Nanoscience & Nanotechnology
Qiurui Han, Wenjun Xu, Chunyu Ji, Gaoyang Xiong, Changsheng Shi, Dongming Zhang, Wenquan Shi, Yuxiang Jiang, Zhili Peng
Summary: A facile reaction system was developed for the preparation of multicolor and white light emitting carbon dots (CDs). Single-component white light-emitting CDs were successfully applied for the fabrication of white LEDs, demonstrating excellent performance.
ACS APPLIED NANO 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
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%.