https://scholars.lib.ntu.edu.tw/handle/123456789/625464
標題: | Enhancing the Performance of Quasi-2D Perovskite Light-Emitting Diodes Using Natural Cyclic Molecules with Distinct Phase Regulation Behaviors | 作者: | Chen C.-H Kuo Y.-H Lin Y.-K Ni I.-C Lin B.-H CHIH-I WU Yip H.-L Kuo C.-C CHU-CHEN CHUEH |
關鍵字: | color purity; light-emitting diodes; natural cyclic molecules; phase regulation; quasi-2D perovskite | 公開日期: | 2022 | 卷: | 14 | 期: | 7 | 起(迄)頁: | 9587-9596 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | In this study, two natural small molecules, α-cyclodextrin (α-CD) and β-cyclodextrin (β-CD), are used as additives to improve the performance of quasi-2D PEA2Csn-1PbnBr3n+1 (n = 3, herein) PeLEDs. Both of them are shown to efficiently passivate the quasi-2D perovskite films to afford improved film quality and morphology, but they exhibit distinct phase regulation behaviors possibly due to their different pore sizes. It reveals that α-CD effectively suppresses the formation of the low-n phases (n ≤ 2), while β-CD better regulates the phase with a medium-n value (n = 3). Because of effectively suppressing the formation of low-n phases, the CD-assisted quasi-2D perovskite films possess facilitated exciton energy transfer and reduced nonradiative recombination. Consequently, the optimized α-CD-derived PeLED shows the highest luminance (Lmax) of 37,825 cd/m2 with an external quantum efficiency (EQE) of 3.81%, while the β-CD-derived PeLED delivers a lower Lmax of 24,793 cd/m2 with an EQE of 3.09%. Compared to the pristine device, Lmax is enhanced by 6.3 and 3.8 times for α-CD-and β-CD-based PeLEDs, respectively, and EQE is enhanced by ∼4.8 times for both devices; besides, both CD-assisted devices also exhibit improved color purity and a lower bias dependency of electroluminescent intensity. © 2022 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85125093771&doi=10.1021%2facsami.1c23594&partnerID=40&md5=a581c1d8815a70e6440dc6fcd6b97f8f https://scholars.lib.ntu.edu.tw/handle/123456789/625464 |
ISSN: | 19448244 | DOI: | 10.1021/acsami.1c23594 | SDG/關鍵字: | Additives; Energy transfer; Light emitting diodes; Molecules; Perovskite; Pore size; Color purity; Cyclic molecules; External quantum efficiency; Lightemitting diode; Natural cyclic molecule; Performance; Perovskite films; Quasi-2d; Quasi-2d perovskite; α-cyclodextrins; Cyclodextrins |
顯示於: | 化學工程學系 |
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