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44.3: Enhancing the Performance and Stability of Sky‐bule Perovskite Light‐emitting Diodes with Guanidinium Thiocyanate Additive
Author(s) -
Luo Zhongming,
Liu Baoxing,
Luo Xi,
Xu Ping,
Kwok Hoi-Sing,
Li Guijun
Publication year - 2021
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.15192
Subject(s) - crystallinity , perovskite (structure) , thiocyanate , materials science , luminescence , thermal stability , quantum efficiency , diode , light emitting diode , optoelectronics , chemical engineering , photochemistry , chemistry , composite material , inorganic chemistry , engineering
Using additives to regulate the morphology of perovskite film is an effective method to enhance the performance of Perovskite Light‐emitting Diodes (PeLEDs). Herein, we propose the strategy of introducing guanidine thiocyanate (GuSCN) additive to improve the crystallinity and reduce the defect density ofthe perovskite film. Compared with the control PLEDs, the PeLEDs added with GuSCN exhibits remarkable external quantum efficiency of 8.62% at 493 nm and a high luminance of 4000 cd/m 2 . Furthermore, the PeLEDs with GuSCN additive shows better stability. The EQE is improved instead of reduced after 30hours storage, and the EL luminescence spectrum shows excellent stability without red shift.