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Remarkable progress has been achieved in perovskite light‐emitting diodes (PeLEDs) . Both green and infrared PeLEDs with external quantum efficiencies (EQEs) of over 20% are successfully developed. However, the performance of pure red PeLEDs remains challenging. Numerous efforts are explored to tune red color emission for higher emission efficiencies, but it is still suffering operation instability. Here, high‐quality and luminescent quasi‐2D (CsPbBrxI3−x)/poly(2‐ethyl‐2‐oxazoline) (PEOXA) composite perovskite thin films are successfully fabricated via a one‐step method. Uniform and smooth perovskite thin films are obtained with photoluminescent quantum yield as high as 65% and emission is tuned from pure red to deep red (638–686 nm). Efficient PeLEDs with device structure of indium tin oxide/ZnMgO/quasi‐2D perovskite/Poly[N,N′‐bis(4‐butylphenyl)‐N,N′‐bis(phenyl)‐benzidine] (Poly‐TPD)/MoO3/Ag have demonstrated a high EQE of 7.0% and pure red emission peak at 654 nm, with Commission Internationale de l'Éclairage coordinates of (0.703, 0.287). While the PeLEDs with an emission peak at 670 nm show a low turn‐on voltage of 1.6 V, maximum luminance of 1942 cd m−2, and maximum EQE of 9.1%. In addition, the PeLEDs achieve good spectral and operational stability with a record half‐lifetime (T50) of over 20 h at a high initial luminance of 100 cd m−2, demonstrating their good potential for display application.
Advanced Optical Materials – Wiley
Published: Dec 1, 2021
Keywords: all‐inorganic lead halide perovskites; light‐emitting diodes; operational stability; PEOXA optimization; pure‐red emission
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