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• W4386646963 abstract "Abstract Quasi‐2D perovskites have attracted extraordinary attention for applications in solution‐processable light‐emitting diodes (LEDs). However, the performance of quasi‐2D perovskite LEDs (PeLEDs) is limited by the wide n phases distribution and the inevitable defects in the emitting films. Herein, a novel bidentate organic molecule ethyl thiooxamate (ETO) with two different electron‐rich functional moieties (C═O and C═S) as an additive is introduced in antisolvent ethyl acetate (EA) to achieve high quality quasi‐2D perovskite (PEA 2 CsPb 2 I 7 ) films. The unsaturated Pb defects caused by iodine vacancy (V I ) and Pb‐I (Pb I ) antisite can be simultaneously passivated though the synergistic action of the C═O and C═S moieties. Meanwhile, suppressing the formation of large n phases results in a more concentrated n phases distribution and improves the cascade energy transfer for boosting the excitons’ radiative recombination. As a result, the fabricated 656 nm pure red PeLEDs show a high maximum luminance of 6483 cd m −2 and a high peak external quantum efficiency of 20.73% with a CIE coordinate of (0.705, 0.293). The optimal device exhibits the superior performances to the reported red quasi‐2D PeLEDs at ≈640–690 nm. This work provides a guidance for rational designing of multidentate organic molecules toward high performance quasi‐2D PeLEDs." @default.
• W4386646963 created "2023-09-13" @default.
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• W4386646963 date "2023-09-12" @default.
• W4386646963 modified "2023-10-09" @default.
• W4386646963 title "Bifunctional Bidentate Organic Additive toward High Brightness Pure Red Quasi‐2D Perovskite Light‐Emitting Diodes" @default.
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• W4386646963 doi "https://doi.org/10.1002/adfm.202308147" @default.
• W4386646963 hasPublicationYear "2023" @default.
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