含氟膦氧衍生物修饰的纯蓝光钙钛矿发光二极管OA北大核心CSTPCD

Achieving efficient blue electroluminescence(EL)is a crucial challenge for the commercial application of perovskite light-emitting diodes(LEDs),especially for pure blue light with wavelengths of 465～475 nm.The main factors contributing to the low efficiency of blue light perovskite LEDs are the high defect density and difficulties in carrier injection induced by the mixed halogen and dimensionality reduction strategies.Herein,we propose an approach for achieving high-performance pure-blue perovskite LEDs by incorporating a fluorine-containing phosphine oxide derivative(PFPO).This incorporation significantly suppresses the non-radiative recombination and fine-tunes the low-dimensional phase distribution of quasi-2D perovskites.The device results reveal that the maximum external quantum efficiency(EQE)of PFPO-treated perovskite LEDs has increased from 1.83％to 3.62％.The emission peak is located at 466 nm,corresponding to CIE of(0.123,0.079),which is close to the International Telecommunication Union(ITU)Rec.2020 blue standard(0.131,0.046).