期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 21, 页码 7040-7044出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201902344
关键词
elemental sulfur; LEDs; photoluminescence; quantum dots; surface etching
资金
- National Natural Science Foundation of China [21804030]
- Research Grant Council of Hong Kong S.A.R. [CityU11305617]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20170818104224667]
An H2O2-assisted top-down approach is used to synthesize brightly luminescent, color-tunable sulfur quantum dots (SQDs), with a photoluminescence quantum yield of up to 23%. The formation of SQDs involves dissolution of bulk sulfur powder into small particles in an alkaline environment in the presence of polyethylene glycol, followed by H2O2-assisted etching of polysulfide species, which has the advantage of the passivation of surface states. This synthetic strategy allows us to simultaneously control the final size of SQDs, to tune their emission color, and to improve their emission quantum yield by eliminating surface traps. Down-conversion white light emitting diodes were also fabricated using blue emissive SQDs and orange emissive copper nanoclusters, with CIE color coordinates of (0.33, 0.32) and a high color rendering index of 91. The water-soluble, highly luminescent SQDs are promising luminescent materials that can be produced from abundant precursor materials.
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