https://scholars.lib.ntu.edu.tw/handle/123456789/631486
標題: | Regulating the phase distribution of quasi-2D perovskites using a three-dimensional cyclic molecule toward improved light-emitting performance | 作者: | Chen, Chiung Han Hsu, Chiao Hsin Ni, I. Chih Lin, Bi Hsuan CHIH-I WU Kuo, Chi Ching CHU-CHEN CHUEH |
公開日期: | 7-十一月-2022 | 出版社: | ROYAL SOC CHEMISTRY | 卷: | 14 | 期: | 46 | 起(迄)頁: | 17409 | 來源出版物: | Nanoscale | 摘要: | In this study, a molecule with a three-dimensional (3D) cyclic structure, a cryptand, is demonstrated as an effective additive for the quasi-two-dimensional (quasi-2D) PEA2Csn−1PbnBr3n+1 (n = 3, herein) to improve its light-emitting performance. The cryptand can effectively regulate the phase distribution of the quasi-2D perovskite through its intense interaction with PbBr2, benefitting from its cage-like structure that can better capture the Pb2+ ions. Due to the inhibited growth of the low-n phases, a much-concentrated phase distribution is achieved for the cryptand-containing films. Moreover, its constituent O/N atoms can passivate the uncoordinated Pb2+ ions to improve the film quality. Such a synergistic effect thereby facilitates the charge/energy transfer among the multiple phases and reduces the non-radiative recombination. As a result, the quasi-2D perovskite light-emitting diode (PeLED) with the optimized cryptand doping ratio is shown to deliver the highest luminance (Lmax) of 15 532 cd m−2 with a highest external quantum efficiency (EQE) of 4.02%. Compared to the pristine device, Lmax is enhanced by ∼5 times and EQE is enhanced by ∼10 times. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/631486 | ISSN: | 20403364 | DOI: | 10.1039/d2nr04735g |
顯示於: | 化學工程學系 |
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