Rare Earth-Doped Perovskite Quantum Dot Microspheres for Micro-LED Displays
Ting Gong, Junjun Shi, Yinggan Zhang, Wenhao Bai, Tongtong Xuan, Tianliang Zhou, Kai Huang, Rong‐Jun Xie
Abstract
Cesium lead bromide perovskite quantum dots (PeQDs) have been recognized as promising color conversion materials for realizing high-performance green micrometer-scale light-emitting diodes (micro-LEDs) to address the “green gap” bottleneck in this field. However, whether their luminescence performance and stability meet the stringent requirements of micro-LED applications remains unclear. Furthermore, traditional PeQDs exhibit obvious luminescence saturation under high light power density excitation. To address these problems, we design and synthesize green-emitting Ce 3+, K + codoped CsPbBr 3 perovskite microspheres by encapsulating codoped PeQDs in mesoporous silica spheres, demonstrating simultaneous near-unity photoluminescence quantum yields and exceptional overall stability. Green micro-LEDs, prepared by using the PeQD microspheres, achieve an external quantum efficiency of up to 19.54% and a high brightness of 4.26 × 10 7 cd m –2 . Finally, green micro-LED arrays were integrated with a thin-film transistor backplane to fabricate a 0.6 in. micro-LED display.