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Highly Efficient Pure‐Blue Light‐Emitting Diodes Based on Rubidium and Chlorine Alloyed Metal Halide Perovskite
Author(s) -
Yang Yang,
Xu Shuang,
Ni Zhenyi,
Van Brackle Charles H.,
Zhao Liang,
Xiao Xun,
Dai Xuezeng,
Huang Jinsong
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100783
Subject(s) - materials science , electroluminescence , quantum yield , perovskite (structure) , halide , optoelectronics , light emitting diode , rubidium , diode , quantum efficiency , photoluminescence , chlorine , inorganic chemistry , optics , nanotechnology , chemical engineering , potassium , fluorescence , metallurgy , chemistry , physics , engineering , layer (electronics)
Perovskite light‐emitting diodes (PeLEDs) are promising candidates for display and solid‐state lighting, due to their tunable colors, high conversion efficiencies, and low cost. However, the performance of blue PeLEDs is far inferior to that of the near‐infrared, red, and green counterparts. Here, the fabrication of pure‐blue PeLEDs with an emission peak at 475 nm, a peak external quantum efficiency of 10.1%, and a maximum luminance of 14 000 cd m −2 is demonstrated by tailoring the compositions of perovskites. The pure‐blue electroluminescence is achieved by simultaneous addition of rubidium and chlorine ions into CsPbBr 3 and incorporation of phenylethylammonium chloride forms quasi‐2D hybrid perovskites. The combination of these composition engineering results in blueshifted emissions without reducing the quantum yield. The judicious alloying is shown to be critical to result in the better morphology with suppressed current leakage and enhanced light outcoupling.