Rational Control of Size and Photoluminescence of WS2 Quantum Dots for White Light-Emitting Diodes

Transition-metal dichalcogenides like tungsten disulfide (WS2) are luminescent but still bear low quantum yields and hardly meet the requirement of practical applications. Here, we developed a hot-injection method to prepare highly luminescent WS2 quantum dots with tunable particle size in a noncoor...

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Published inACS applied materials & interfaces Vol. 10; no. 50; pp. 43824 - 43830
Main Authors Yin, Wenxu, Bai, Xue, Chen, Ping, Zhang, Xiaoyu, Su, Liang, Ji, Changyin, Gao, Haoming, Song, Hongwei, Yu, William W
Format Journal Article
LanguageEnglish
Published American Chemical Society 19.12.2018
Subjects
quantum dot
noncoordinating solvent
tungsten disulfide
LED
photoluminescence
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Summary:Transition-metal dichalcogenides like tungsten disulfide (WS2) are luminescent but still bear low quantum yields and hardly meet the requirement of practical applications. Here, we developed a hot-injection method to prepare highly luminescent WS2 quantum dots with tunable particle size in a noncoordinating solvent, some that are even smaller than its Bohr radius. The as-synthesized WS2 quantum dots exhibit a narrow size distribution and a high photoluminescence quantum yield of 32%, the highest record compared to the known reports. The WS2 quantum dot layer was employed to fabricate white light-emitting diodes with a maximum brightness of 507 cd/m2, adjustable color temperatures from 4100 to 10 000 K, and excellent color rendering index of 91. These results confirm the promising optoelectronic applications of WS2 quantum dots.
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ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.8b17966