Luminance efficiency roll-off mechanism in CsPbBr3-xClx mixed-halide perovskite quantum dot blue light-emitting diodes
- Authors
- Park, Young Ran; Kim, Hong Hee; Eom, Sangwon; Choi, Won Kook; Choi, Hyosung; Lee, Bo Ram; Kang, Young Jong
- Issue Date
- Mar-2021
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- Journal of Materials Chemistry C, v.9, no.10, pp.3608 - 3619
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Materials Chemistry C
- Volume
- 9
- Number
- 10
- Start Page
- 3608
- End Page
- 3619
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/142237
- DOI
- 10.1039/d0tc05514j
- ISSN
- 2050-7526
- Abstract
- Efficiency roll-off is a significant issue in blue light-emitting diodes (LEDs), but its origin still remains controversial. We report CsPbBr3−xClx/PbBry(or PbCly) (core/shell) quantum dot LEDs exhibiting the emission peak spanning fromλpeak= 492 toλpeak= 435 nm by varying the Cl composition (0 ≤x≤ 2.21). PLQY and EQE significantly decreased with the increase of the Cl composition. Careful analyses of the composition and the energy structure using EL, PL, TRPL, UPS, XPS and STEM-EDX measurements reveal that the luminance efficiency roll-off in CsPbBr3−xClxLEDs is attributed to the following three combined effects: (1) luminescence quenching by the non-radiative trap-assisted recombination, (2) the hole transfer process at the CsPbBr3−xClx/PbBrycore/shell, and (3) imbalanced charge injection caused by a high energy barrier for the hole conduction at the PVK/QD heterointerface (Δh′)
- Files in This Item
-
Go to Link
- Appears in
Collections - 서울 자연과학대학 > 서울 화학과 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/142237)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.