Composition Optimization of Multifunctional CsPb(Br/I)₃ Perovskite Nanocrystals Glasses with High Photoluminescence Quantum Yield

Abstract Currently, high optical purity, perfect stability, and high photoluminescence quantum yield (PLQY) are very important, being the key to obtain high‐quality luminescent materials. The research of perovskite nanocrystals (NCs) as optical materials is in full swing. Nevertheless, the low PLQY value, especially for the red‐emitting perovskite NCs, is a main obstacle to applications in display. This work reports the optimized components to synthesize CsPb(Br/I)₃ NCs glasses whose PLQY achieves a big boost from 15.4% to ≈60% for the first time. Furthermore, the specimens exhibit exceptional tolerance to water and thermal and hence contribute to applicability in high‐performance light‐emitting diode (LED) and 3D printing. By combining CsPb(Br/I)₃ NCs glass powder and yttrium aluminum garnet (YAG):Ce phosphor with blue chips, the assembled white LEDs reach a high luminous efficiency at 113.0 lm W⁻¹. The resulting high PLQY is to the benefit of a substantial step toward the practical application of inorganic perovskite materials in the fields of optoelectronic devices and additive manufacturing.