1. Cs2Zr1−xTexCl6 Perovskite Microcrystals with Ultrahigh Photoluminescence Quantum Efficiency of 79.46% for High Light Efficiency White Light Emitting Diodes.
- Author
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Li, Zhilin, Rao, Zhihui, Li, Qiaoqiao, Zhou, Liujiang, Zhao, Xiujian, and Gong, Xiao
- Subjects
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LIGHT emitting diodes , *QUANTUM efficiency , *PEROVSKITE , *PHOTOLUMINESCENCE , *OPTICAL properties , *POWDERS , *CESIUM compounds - Abstract
Recently, lead‐free materials with stable photoluminescence (PL) at room temperature, such as vacancy‐ordered double perovskites have drawn wide attention. Herein, Te4+‐doped all‐inorganic lead‐free Cs2Zr1−xTexCl6 perovskite microcrystals (MCs) are reported. The obtained pure Cs2ZrCl6 perovskite MCs exhibit a blue emission, while Cs2Zr1−xTexCl6 perovskite MCs show a broad and strong yellow emission with ultrahigh photoluminescence quantum yield (PLQY) up to 79.46% at room temperature. The structure and optical properties of perovskite MCs are investigated in detail by experiments and theoretical calculations. The mechanism that 3P1 of Te can be partially frozen at the low temperature regarding Cs2Zr1−xTexCl6 perovskite MCs is proposed. White light emitting diodes (WLEDs) with a color coordinate of (0.344, 0.333), a correlated color temperature of 4959 K, a color rendering index (Ra) of 74.8, and a high light efficiency of 91.16 lm W−1, are fabricated by the prepared Cs2Zr1−xTexCl6 perovskite MCs powder with a commercial near‐UV LED (NUV‐LED) chip (450 nm). The results suggest that Te4+‐doped all‐inorganic lead‐free perovskite MCs show great potential in the next‐generation solid‐state lightings. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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