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, Youngjong
- Issue Date
- 2021-03
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.9, no.10, pp.3608 - 3619
- 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 from lambda(peak) = 492 to lambda(peak) = 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-xClx LEDs 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/PbBry core/shell, and (3) imbalanced charge injection caused by a high energy barrier for the hole conduction at the PVK/QD heterointerface (Delta h ').
- ISSN
- 2050-7526
- URI
- https://pubs.kist.re.kr/handle/201004/117290
- DOI
- 10.1039/d0tc05514j
- Appears in Collections:
- KIST Article > 2021
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