Facile, air-insensitive solvothermal synthesis of emission-tunable CuInS2/ZnS quantum dots with high quantum yields

被引:149
作者
Nam, Da-Eun [1 ]
Song, Woo-Seuk [1 ]
Yang, Heesun [1 ]
机构
[1] Hongik Univ, Dept Mat Sci & Engn, Seoul 121791, South Korea
基金
新加坡国家研究基金会;
关键词
SEMICONDUCTOR NANOCRYSTALS; CORE/SHELL NANOCRYSTALS; OPTICAL-PROPERTIES; LUMINESCENT; NANOPARTICLES; SIZE;
D O I
10.1039/c1jm12437d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Yellow-to-red emitting CuInS2/ZnS (CIS/ZnS) core/shell quantum dots (QDs) with a maximum photoluminescence quantum yield (QY) of similar to 65% were facilely synthesized via a stepwise, consecutive solvothermal approach. The size-sorting experiments on CIS/ZnS QDs indicated that the ZnS shell was formed with a relatively uniform thickness even though the size of pre-existing CIS core QDs was not monodisperse. CIS core QDs solvothermally grown for different reaction times of 5-6 h exhibited poor QYs of < 8.8% with deep red emissions as a result of donor-acceptor pair (DAP) recombination. Upon shell overcoating, the band gap energies of CIS/ZnS QDs increased by 0.14-0.23 eV, depending on the CIS core growth time. Such increased band gaps were attributed presumably to the reduction of actual CIS core size, originating from the formation of the alloyed interfacial layer at CIS/ZnS during a long shell growth. Compared to CIS core QDs, the emission of CIS/ZnS QDs was markedly blue-shifted by 0.10-0.18 eV. This blue-shift was discussed based on the shift of QD band gap-dependent donor/acceptor energy levels and the donor-acceptor distance-dependent DAP recombination process.
引用
收藏
页码:18220 / 18226
页数:7
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