The fabrication of perovskite film is crucial for achieving efficient perovskite photoelectric device. Herein, a simple and novel encapsulation growth method was applied to prepare high-quality quasi-2D perovskite films with advantages of compact and uniform morphology, high crystallinity with lower defect density, enhanced photoluminescence quantum yield (PLQY) and optimized multidimensional domain distribution and crystallite orientation for perovskite light-emitting diodes (PeLEDs). The encapsulation growth method was found to decrease the proportion of the low-dimensional (n = 1,2,3) domains while increasing the high-dimensional domains content with randomly-oriented crystals, which simultaneously enhanced the overall energy landscape effect and charges transport within the quasi-2D perovskite films, and the PLQY of the quasi-2D perovskites significantly improved from 9.2% to 60.0%. Finally, an efficient flexible green PeLEDs was obtained with a high luminous efficiency (LE) of 47.1 cd/A, and a luminance brightness of 8300 cd/m2, and an efficient sky-blue PeLEDs was also achieved with record EQE of 12.8% by using encapsulation growth method. This encapsulation growth method provides a promising strategy for boosting the efficiency of quasi-2D PeLEDs.
Bibliographical noteFunding Information:
Yanliang Liu, Zhongkai Yu and Shi Chen contributed equally to this work. This study was supported by the National Research Foundation of Republic of Korea (NRF- 2018R1C1B6005778 and 2020R1A2B5B01001611 ), and the Peacock Team Project funding from Shenzhen Science and Technology Innovation Committee (Grant No. KQTD2015033110182370 ). This work was also financially supported by the National Natural Science Foundation of China ( 62004091 , 62004089 ) and the Fundamental Research Project from Shenzhen Science and Technology Innovation Committee (Grant No. JCYJ20190809150811504 ) and the Joint Funds Project from Guangdong Basic and Applied Basic Research Fundation (Grant No. 2019A1515110439 ).
© 2020 Elsevier Ltd
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering