期刊
ACS NANO
卷 10, 期 10, 页码 9297-9305出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b03704
关键词
spherical quantum well; near-unity photoluminescence quantum yield; coherently strained heterostructure; misfit defect; critical thickness
类别
资金
- Korea Institute of Science and Technology (KIST) [2E26530]
- Ministry of Trade, Industry Energy (MOTIE) [10051541]
- Korea Display Research Consortium (KDRC) support program for the development of future devices technology for display industry
- National Research Foundation (NRF) - Korean government [NRF-2014R1A2A2A01006739, NRF-2015R1A2A1A01004354, NRF-2016M3A7B4910618]
Thick inorganic shells endow colloidal nanocrystals (NCs) with enhanced photochemical stability and suppression of photoluminescence intermittency (also known as blinking). However, the progress of using thick-shell 100 90 heterostructure NCs in applications has been limited due to the low photoluminescence quantum yield (PL QY <= 60%) at room temperature. Here, we demonstrate thick-shell NCs with CdS/CdSe/CdS seed/spherical quantum well/shell (SQW) geometry that exhibit near-unity PL QY at room temperature and suppression of blinking. In SQW NCs, the lattice mismatch is diminished between the emissive CdSe layer and the surrounding CdS layers as a result of coherent strain, which suppresses the formation of misfit defects and consequently permits, similar to 100% PL QY for SQW NCs with a thick CdS shell (>5 nm). High PL QY of thick-shell SQW NCs is preserved even in concentrated dispersion and in film under thermal stress, which makes them promising candidates for applications in solid-state concentrators.
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