Suppressing halide segregation for Spectral-Stable Blue Quasi-2D Perovskite Light-Emitting Diodes
발표자
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초록
내용
Efforts to enhance efficiency and stability of blue perovskite light-emitting diodes are urgently required for the advancement of full-color display technologies. Quasi two-dimensional perovskites have garnered significant attention for their potential as efficient light-emitting materials owing to their energy cascade properties. However, low n-phases are poor emitters due to strong electron-phonon coupling resulting in nonradiative recombination. Additionally, phase segregation in mixed halide(Cl/Br) perovskite blue emitter leads to spectral instability, which is one of the main obstacles toward further practical applications.
In this study, we introduce a strongly binding organic ligand to suppress low n-phase formation and phase segregation. We achieve a substantial improvement in overall device performance. More importantly, our approach enables enhanced spectral-stability, exhibiting only a 2-nm shift during a voltage sweep from 3V to 6.5V.