Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs
Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs
复制标题
用于单相白光 LED 的缺乏金属活化剂中心的高效可调光致发光勃姆石混合纳米板
DOI：
10.1038/ncomms6702
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发表时间：
2014-12-01
影响因子：
16.6
通讯作者：
Pinna, Nicola
中科院分区：
文献类型：
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作者：
Bai, Xue;Caputo, Gianvito;Pinna, Nicola
白色发光二极管（WLED）是革新照明工业朝向节能和环境友好的照明和显示器的候选者。WLED目前面临的挑战包括高发光效率、色彩稳定性、高显色指数和价格竞争力。近年来，人们对用于紫外/蓝光到白色光转换的高效且低成本的下转换光致发光磷光体的开发进行了高度研究。在这里，我们报告了一个简单的路线，设计高效率的WLED相结合的商业紫外LED芯片（InGaAsN，390 nm）和勃姆石（γ-AlOOH）混合纳米片。不寻常的高量子产率（η产率=38-58%）是由于勃姆石相关态和结合到纳米片表面的苯甲酸酯配体的三重态之间的协同能量转移。具有η产率=38%的纳米片能够发射白色光，其具有国际照明委员会坐标、显色指数和相关色温值分别为（0.32，0.33）、85.5和6，111 K;压倒最先进的单相紫外泵浦WLED磷光体。
White light-emitting diodes (WLEDs) are candidates to revolutionize the lighting industry towards energy efficient and environmental friendly lighting and displays. The current challenges in WLEDs encompass high luminous efficiency, chromatic stability, high colour-rending index and price competitiveness. Recently, the development of efficient and low-cost downconverting photoluminescent phosphors for ultraviolet/blue to white light conversion was highly investigated. Here we report a simple route to design high-efficient WLEDs by combining a commercial ultraviolet LED chip (InGaAsN, 390 nm) and boehmite (γ-AlOOH) hybrid nanoplates. Unusually high quantum yields (ηyield=38–58%) result from a synergic energy transfer between the boehmite-related states and the triplet states of the benzoate ligands bound to the surface of the nanoplates. The nanoplates withηyield=38% are able to emit white light with Commission International de l’Eclairage coordinates, colour-rendering index and correlated colour temperature values of (0.32, 0.33), 85.5 and 6,111 K, respectively; overwhelming state-of-the-art single-phase ultraviolet-pumped WLEDs phosphors.