Simultaneous low-order phase suppression and defect passivation for efficient and stable blue light emitting diodes

Wallace C. H. Choy

doi:10.1117/12.2595122

1 August 2021 Simultaneous low-order phase suppression and defect passivation for efficient and stable blue light emitting diodes

Wallace C. H. Choy

Author Affiliations +

Proceedings Volume 11808, Organic and Hybrid Light Emitting Materials and Devices XXV; 118080X (2021) https://doi.org/10.1117/12.2595122
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States

Abstract

Quasi-2D perovskite is considered as a promising candidate for blue perovskite light emitting diode (PeLEDs). However, the wide distribution of low-order phases, inefficient energy transfer, and defects/traps increase the non-radiative recombination, further aggravating PeLED external quantum efficiency (EQE). We demonstrate a unique quasi-2D perovskite with low-order phase suppression and defect passivation by incorporating a 2D perovskite and an excess ammonium salt into the quasi-2D perovskite. By optimizing the new quasi-2D perovskites, we achieve blue PeLEDs with brightness 1765 cd m-2, EQE 7.51%, low turn-on voltage 3.07 V, and long operation lifetime 3961 sec without any shift in electroluminescent spectra.

Conference Presentation

Citation Download Citation

Wallace C. H. Choy "Simultaneous low-order phase suppression and defect passivation for efficient and stable blue light emitting diodes", Proc. SPIE 11808, Organic and Hybrid Light Emitting Materials and Devices XXV, 118080X (1 August 2021); https://doi.org/10.1117/12.2595122

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