Design of perovskite light-emitting diodes based on FAPbBr3 nanocrystals synthesized by ultrasonic crushing method

Xiangqian Cui; Bobo Li; Zhixiang Ye; Chenrun Liu; Xuyang Liu; Mingxia Qiu

doi:10.1117/12.2686943

6 August 2023 Design of perovskite light-emitting diodes based on FAPbBr₃ nanocrystals synthesized by ultrasonic crushing method

Xiangqian Cui, Bobo Li, Zhixiang Ye, Chenrun Liu, Xuyang Liu, Mingxia Qiu

Author Affiliations +

Proceedings Volume 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023); 127813A (2023) https://doi.org/10.1117/12.2686943
Event: 2023 International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 2023, Guangzhou, JS, China

Abstract

Perovskite light-emitting materials possess advantages of high photoluminescence quantum yield (PLQY) and charge carrier mobility, large carrier diffusion length, narrow emission spectrum, easily tunable bandgap, and low preparation costs, leading to the great research enthusiasm in the last decade. However, the research progress of blue perovskite light-emitting diode (LED) is slow, because the synthesis of blue perovskite material is difficult and it is unstable in the air. In this work, blue and green perovskite quantum dots (PQDs) can be obtained by adjusting the growth temperature and ultrasonic time. Photoluminescence (PL) measurements suggest that the luminescence wavelength of PQDs decreases significantly from 528nm to 468nm with increasing the ultrasound time from 4 to 30 min and decreasing the temperature from 2 to -10℃. The reduction of grain size investigated by transmission electron microscopy (TEM) is responsible for the blue-shift of luminous peaks. The perovskite light-emitting diodes (PeLEDs) based on the as-prepared green and blue PQDs have been fabricated. The best performing PeLEDs devices for green and blue light emission showed the maximum external quantum efficiency (EQE) of 6.179% and 0.45%, respectively. This work provides an effective method for the preparation of blue-green PQDs and PeLEDs.

Citation Download Citation

Xiangqian Cui, Bobo Li, Zhixiang Ye, Chenrun Liu, Xuyang Liu, and Mingxia Qiu "Design of perovskite light-emitting diodes based on FAPbBr₃ nanocrystals synthesized by ultrasonic crushing method", Proc. SPIE 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 127813A (6 August 2023); https://doi.org/10.1117/12.2686943

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KEYWORDS

Nanocrystals

Perovskite

Light emitting diodes

Ultrasonics

Electroluminescence

External quantum efficiency

Photoluminescence

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