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Hydrogen Peroxide Assisted Synthesis of Highly Luminescent Sulfur Quantum Dots
Author(s) -
Wang Henggang,
Wang Zhenguang,
Xiong Yuan,
Kershaw Stephen V.,
Li Tianzi,
Wang Yue,
Zhai Yongqing,
Rogach Andrey L.
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201902344
Subject(s) - quantum dot , photoluminescence , materials science , luminescence , quantum yield , passivation , nanoparticle , nanotechnology , nanoclusters , chemical engineering , photochemistry , chemistry , optoelectronics , fluorescence , physics , layer (electronics) , quantum mechanics , engineering
An H 2 O 2 ‐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 H 2 O 2 ‐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.