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Strategies Toward Efficient Blue Perovskite Light‐Emitting Diodes
Author(s) -
Ren Zhenwei,
Wang Kai,
Sun Xiao Wei,
Choy Wallace C. H.
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202100516
Subject(s) - perovskite (structure) , materials science , light emitting diode , passivation , optoelectronics , diode , halide , doping , nanocrystal , nanotechnology , layer (electronics) , inorganic chemistry , chemical engineering , chemistry , engineering
Substantial progress has been made in blue perovskite light‐emitting diodes (PeLEDs). In this review, the strategies for high‐performance blue PeLEDs are described, and the main focus is on the optimization of the optical and electrical properties of perovskites. In detail, the fundamental device working principles are first elucidated, followed by a systematical discussion of the key issues for achieving high‐quality perovskite nanocrystals (NCs) and quasi‐2D perovskites. These involve ligand optimization and metal doping in enhancing the carrier transport and reducing the traps of perovskite NCs, as well as the perovskite phase modulation and defect passivation in improving energy transfer and emission efficiency of quasi‐2D perovskites. The strategies for efficient 3D mixed‐halide perovskite and lead‐free perovskite blue LEDs are then briefly introduced. After that, other strategies, including effective charge transport layer, efficient perovskite emission system, and effective device architecture for high light outcoupling efficiency, are further discussed to boost the blue PeLED performances. Meanwhile, the testing standard of blue PeLED lifetime is suggested to enable the direct comparisons of the device operational stability. Finally, challenges and future directions for blue PeLEDs are addressed.