Efficient blue perovskite LEDs from quantum confined structures

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 3-4
• 页数: 2页
• 语种: 英文

摘要

Lead halide perovskites have been leading the optoelectronic field for the last several years, with exceptional progress in photovoltaics and rapid improvement in light emitting diodes (LEDs).LEDs are limited by outcoupling and waveguiding to approximately 20％ external quantum efficiency (EQE),and infrared and green perovskite LEDs have already reached this threshold [1-3].For most applications, however,blue light is also required, and blue perovskite LEDs have been left behind, with a maximum EQE of 5.7％ at 480 nm [4], and ～2％ at wavelengths less than 470 nm [5].These lower efficiencies are due to both challenges inherent in blue(i.e., wide band gap) materials as well as stability and defect problems specific to blue perovskites.