Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking
- Authors
- Jeong, Byeong Guk; Park, Young-Shin; Chang, Jun Hyuk; Cho, Ikjun; Kim, Jai Kyeong; Kim, Heesuk; Char, Kookheon; Cho, Jinhan; Klirnov, Victor I.; Park, Philip; Lee, Doh C.; Bae, Wan Ki
- Issue Date
- 10월-2016
- Publisher
- AMER CHEMICAL SOC
- Keywords
- spherical quantum well; near-unity photoluminescence quantum yield; coherently strained heterostructure; misfit defect; critical thickness
- Citation
- ACS NANO, v.10, no.10, pp.9297 - 9305
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 10
- Number
- 10
- Start Page
- 9297
- End Page
- 9305
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/87355
- DOI
- 10.1021/acsnano.6b03704
- ISSN
- 1936-0851
- Abstract
- 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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