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Multicolor Light‐Emitting Diodes with MoS 2 Quantum Dots
Author(s) -
Yin Wenxu,
Bai Xue,
Zhang Xiaoyu,
Zhang Jia,
Gao Xupeng,
Yu William W.
Publication year - 2019
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201800362
Subject(s) - quantum dot , photoluminescence , optoelectronics , light emitting diode , materials science , wavelength , diode , molybdenum disulfide , radiation , excitation , visible spectrum , blueshift , optics , physics , quantum mechanics , metallurgy
Molybdenum disulfide (MoS 2 ) quantum dots (QDs) are known for their excitation‐wavelength‐dependent photoluminescent (PL) properties. However, the mechanism of this phenomenon is still unclear. Here, small size MoS 2 QDs with a narrow size distribution are synthesized. Based on the decay study and PL dynamics, a reasonable radiation model is presented to understand the special PL properties, i.e., the carrier recombination in the localized surface defect states generated the PL. Accordingly, this optical property is used to fabricate multicolor light‐emitting devices with the same MoS 2 QDs. The emission color covers the full visible spectrum from blue to red, only by adjusting the thickness of the down‐conversion QD layers.