Defect Passivation for Red Perovskite Light-Emitting Diodes with Improved Brightness and Stability.
J Phys Chem Lett
; 10(3): 380-385, 2019 Feb 07.
Article
em En
| MEDLINE
| ID: mdl-30596240
ABSTRACT
Efficient and stable red perovskite light-emitting diodes (PeLEDs) are important for realizing full-color display and lighting. Red PeLEDs can be achieved either by mixed-halide or low-dimensional perovskites. However, the device performance, especially the brightness, is still low owing to phase separation or poor charge transport issues. Here, we demonstrate red PeLEDs based on three-dimensional (3D) mixed-halide perovskites where the defects are passivated by using 5-aminovaleric acid. The red PeLEDs with an emission peak at 690 nm exhibit an external quantum efficiency of 8.7% and a luminance of 1408 cd m-2. A maximum luminance of 8547 cd m-2 can be further achieved as tuning the emission peak to 662 nm, representing the highest brightness of red PeLEDs. Moreover, those LEDs exhibit a half-life of up to 8 h under a high constant current density of 100 mA cm-2, which is over 10 times improvement compared to literature results.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
J Phys Chem Lett
Ano de publicação:
2019
Tipo de documento:
Article