Recently,perovskite light-emitting diodes(PeLEDs)have developed rapidly in the green,red,and near-infrared light emissions,owing to the unique optoelectronic characteristics of halide perovskites,such as high carrier mobility,narrow emission linewidths,high photoluminescence quantum yield,as well as bandgap tunability.However,the efficiency improvement in blue(especially deep-blue)PeLEDs is still inferior to other analogs,which severely restricts the PeLED applications.Here,we systematically sum-marize the substantial progress in the performance of blue PeLEDs based on different blue perovskite candidates,and recent advances from three aspects(i.e.,the sky-blue,pure-blue,and deep-blue light emissions).Then,we point out several challenges existing in deep-blue PeLEDs,such as the effect of Cl-ions incorporation,spectral instability,ion migration,and the difficulty of charge injection,and high-light the strategies to improve device efficiency,to motivate further research and development of blue PeLEDs.

Lin Zhang;Run Long

College of Chemistry,Key Laboratory of Theoretical&Computational Photochemistry of Ministry of Education,Beijing Normal University,Beijing 100875,China

能源化学

[1]Lin Zhang;Run Long-.Developments and challenges ahead in blue perovskite light-emitting devices)[J].能源化学,2022(08):418-433

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