Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 1, Pages 558-565Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12859
Keywords
tungsten sulfide WS2; nanocrystals; transition metal dichalcogenides (TMDC); electroluminescence; quantum confinement quantum dots
Funding
- Department of Science and Technology [IFA 13-MS-09, DST/TM/CERI/C74(G)]
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Sonication induced vertical fragmentation of two-dimensional (2D) WS2 nanosheets into highly luminescent, monodispered, zero-dimensional (OD) quantum dots (QDs) is reported. The formation of OD structures from 2D sheets and their surface/microstructure characterization are revealed from their microscopic and spectroscopic investigations. Size dependent optical properties of WS2 nanostructures have been explored by UV vis absorption and photoluminescence spectroscopy. Interestingly, it is observed that, below a critical dimension (similar to 2 nm), comparable to the Bohr exciton radius, the tiny nanocrystals exhibit strong emission. Finally, the electroluminescence characteristics are demonstrated for the first time, by forming a heterojunction of stabilizer free WS2 QDs and ZnO thin films. The signature of white light emission in the light emitting device is attributed to the adequate intermixing of emission characteristics of WS2 QDs and ZnO. The observation of white electroluminescence may pave the way to fabricate prototype futuristic efficient light emitting devices.
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