Luminance efficiency roll-off mechanism in CsPbBr3-xClx mixed-halide perovskite quantum dot blue light-emitting diodes

Authors
Park, Young RanKim, Hong HeeEom, SangwonChoi, Won KookChoi, HyosungLee, Bo RamKang, 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 &apos;).
ISSN
2050-7526
URI
https://pubs.kist.re.kr/handle/201004/117290
DOI
10.1039/d0tc05514j
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KIST Article > 2021
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