State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering , Jilin University , 2699 Qianjin Street , Changchun 130012 , P. R. China.
ACS Appl Mater Interfaces. 2018 Nov 14;10(45):39040-39048. doi: 10.1021/acsami.8b14275. Epub 2018 Oct 31.
White light-emitting diodes (WLEDs) based on all-inorganic perovskite CsPbX (X = Cl, Br, I) nanocrystals (NCs) have attracted extensive interests. However, the native ion exchange among halides makes them extremely difficult to realize the white emission. Herein, we demonstrate a novel strategy to obtain WLED phosphors based on the codoping of different metal ion pairs, such as Ce/Mn, Ce/Eu, Ce/Sm, Bi/Eu, and Bi/Sm into stable CsPbCl and CsPbCl Br NCs. Notably, by the typical anion exchange reaction, the highly efficient white emission of Ce/Mn-codoped all-inorganic CsPbClBr perovskite NCs was achieved, with an optimal photoluminescence quantum yield of 75%, which is much higher than the present record of 49% for single perovskite phosphors. Moreover, the WLED with a luminous efficiency of 51 lm/W based on the 365 nm ultraviolet chip and CsPbClBr:Ce/Mn nanophosphor was achieved. This work represents a novel device for perovskite-based phosphor-converted WLEDs.
基于全无机钙钛矿 CsPbX（X = Cl、Br、I）纳米晶体（NCs）的白光发光二极管（WLED）引起了广泛的关注。然而，卤化物之间的本征离子交换使得它们极难实现白光发射。在此，我们展示了一种新策略，通过将不同金属离子对（如 Ce/Mn、Ce/Eu、Ce/Sm、Bi/Eu 和 Bi/Sm）共掺杂到稳定的 CsPbCl 和 CsPbClBr NCs 中，获得基于共掺杂的 WLED 荧光粉。值得注意的是，通过典型的阴离子交换反应，实现了高效的 Ce/Mn 共掺杂全无机 CsPbClBr 钙钛矿 NCs 的白光发射，其最佳光致发光量子产率为 75%，远高于目前单钙钛矿荧光粉 49%的记录。此外，基于 365nm 紫外芯片和 CsPbClBr：Ce/Mn 纳米荧光粉实现了发光效率为 51lm/W 的 WLED。这项工作代表了一种基于钙钛矿的磷光转换 WLED 的新型器件。
