Efficient and Stable Perovskite White Light‐Emitting Diodes for Backlit Display

Abstract High‐quality backlit display puts forward urgent demand 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, naked MHPs suffer from long‐term instable issue and cannot pass harsh stability tests. Herein, amorphous‐glass‐protected green/red CsPbX 3 quantum dots (QDs) are prepared by elaborately optimizing glass structure, perovskite concentration, and in situ crystallization. PLQYs of green CsPbBr 3 @glass and red CsPbBr 1.5 I 1.5 @glass reach 94% and 78%, respectively, which are the highest ones of CsPbX 3…

• NN
  National Natural Science Foundation of China

  Awards: 12074068, 51972060, 52272141, 52102159, 22103013
• NS
  Natural Science Foundation of Fujian Province

  Awards: 2021J06021, 2020J02017
• NK
  National Key Research and Development Program of China

  Award: 2021YFB3500503