Publication date: 3rd July 2020
Abstract:
The transition-metal dichalcogenide (TMDC) quantum dots (WS2, WSe2, MoSe2, MoS2) were discovered with a direct band gap TMDCs have become a new class of semiconductors for optoelectronic applications. They possess tunable band gaps and attractive optical phenomena such as indirect to direct band gap crossover and strong photocurrent responses. Tungsten disulfide quantum dots (WS2QDs) are luminescent but still low quantum yields. Here, we developed a Simple one step hydrothermal method to prepare highly luminescent WS2 quantum dots with tunable particle size, some that are even smaller than its Bohr radius. The as-synthesized WS2 quantum dots exhibit a good photoluminescence property. The WS2 quantum dot layer was entrapped with a the support of Polyvinyl Alcohol (PVA) Flim to fabricate white light-emitting diodes. It supplies color rendering index of 76% and CIE Co-ordinates (0.35,0.34) These results confirm the promising optoelectronic applications of WS2 quantum dots.
Keywords: Transition-metal dichalcogenide; Tungsten disulfide; Quantum dot; LED
Acknowledgement: SPARC, UKERI and RUSA 2.0
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