High-quality backlit display puts forward urgent demands for color-converting materials. Recently, metal halide perovskites (MHPs) with full spectral tunability, high photoluminescence quantum yields (PLQYs), and high color purity have found potential application in wide-color-gamut display. Regrettably, MHPs suffer from long-term instable issue and cannot pass harsh stability tests.
Herein, amorphous-glass-protected green/red CsPbX3 quantum dots (QDs) are prepared by elaborately optimizing glass structure, perovskite concentration, and in situ crystallization. PLQYs of green CsPbBr3@glass and red CsPbBr1.5I1.5@glass reach 94% and 78% respectively, which are the highest ones of CsPbX3@glass composites reported so far. Benefiting from effective protection by glass network, CsPbX3@glass can endure blue-light irradiation and the commercial standard aging tests of 85 °C/85%RH, and be applied to construct white light-emitting diodes (wLEDs). Accordingly, the perovskite wLED-array-based backlit unit and a prototype QD display device are designed for the first time, showing more vivid and wide-color-gamut feature.
The research, titled “Efficient and Stable Perovskite White Light-Emitting Diodes for Backlit Display”, was published in Advanced Functional Materials. FNU is the first organization of the paper, with Chen Shuxin, a master student of FNU, as the first author, and Prof. Chen Daqin of FNU as the co-corresponding author. The work was funded by such projects as the National Key Research Programs, the National Natural Science Foundation of China, and the Key Natural Science Foundation of Fujian Province.
Paper link: https://onlinelibrary.wiley.com/doi/10.1002/adfm.202213442
(Translated by Chen Wenjia/ Reviewed by Xie Xiujuan)