Miao Huixian, Pan Xiancheng, Li Miao, Zhaxi Wenjiang, Wu Jing, Huang Zetao, Liu Luying, Ma Xiao, Jiang Shenlong, Huang Wei, Zhang Qun, Wu Dayu
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis & Green Manufacturing Collaborative Innovation Center, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, P. R. China.
Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemical Physics, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, Anhui, P. R. China.
Inorg Chem. 2022 Nov 21;61(46):18779-18788. doi: 10.1021/acs.inorgchem.2c03322. Epub 2022 Nov 8.
Phosphor-converted white light-emitting diodes (pc-wLEDs) are promising candidates for next-generation solid-state lighting and display technologies. However, most of the conventional phosphors in pc-wLED devices suffer from serious thermal quenching (TQ) at high temperatures. Herein, we investigate an unconventional high-efficiency metal-halide cluster-based phosphor with dynamic Cu-Cu interactions that can resist the TQ effect of photoluminescence. The temperature-dependent structure and solid-state and NMR spectroscopy reveal that the weakening of the Cu-Cu interaction in such a phosphor system enables the electronic structural transition from a bonding to a nonbonding state and hence sustains the PL efficiency at high temperatures (up to 100 °C). The pc-wLEDs incorporating the zero-TQ phosphor show a rapid brightness rise even at a high bias current (1000 mA) with a color rendering index as high as 90, comparable to the commercial phosphor-based prototype LEDs (.., YAG:Ce). This work establishes a novel prototype of a cluster-based phosphor featuring dynamic intermetallic interactions, which paves the way for the exploration of pc-wLEDs against thermal quenching.
磷光转换白光发光二极管（pc-wLEDs）是下一代固态照明和显示技术的有前途的候选者。然而，pc-wLED器件中的大多数传统磷光体在高温下会遭受严重的热猝灭（TQ）。在此，我们研究了一种具有动态Cu-Cu相互作用的非常规高效金属卤化物簇基磷光体，其能够抵抗光致发光的TQ效应。温度依赖的结构以及固态和核磁共振光谱表明，这种磷光体系统中Cu-Cu相互作用的减弱使电子结构从成键态转变为非成键态，从而在高温（高达100°C）下维持PL效率。包含零TQ磷光体的pc-wLED即使在高偏置电流（1000 mA）下也能快速提高亮度，显色指数高达90，与基于商业磷光体的原型LED（如YAG:Ce）相当。这项工作建立了一种具有动态金属间相互作用的簇基磷光体的新型原型，为探索抗热猝灭的pc-wLEDs铺平了道路。
