期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 9, 期 10, 页码 3608-3619出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc05514j
关键词
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资金
- National Research Foundation of Korea (NRF) - Korea Government (MSIT) [2019R1A2C1005265, 2020R1A2C2100802]
- National Research Foundation of Korea [2020R1A2C2100802, 2019R1A2C1005265] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Efficiency roll-off in blue light-emitting diodes is attributed to a combination of factors, including luminescence quenching, charge transfer processes at the core/shell interface, and imbalanced charge injection at the heterointerface.
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 ').
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