Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking

Byeong Guk Jeong, Young Shin Park, Jun Hyuk Chang, Ikjun Cho, Jai Kyeong Kim, Heesuk Kim, Kookheon Char, Jinhan Cho, Victor I Klimov, Philip Park, Doh C. Lee, Wan Ki Bae

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51 Citations (Scopus)

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 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 ∼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 lightings and luminescent solar concentrators.

Original languageEnglish
Pages (from-to)9297-9305
Number of pages9
JournalACS Nano
Volume10
Issue number10
DOIs
Publication statusPublished - Oct 25 2016

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Keywords

  • coherently strained heterostructure
  • critical thickness
  • misfit defect
  • near-unity photoluminescence quantum yield
  • spherical quantum well

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Jeong, B. G., Park, Y. S., Chang, J. H., Cho, I., Kim, J. K., Kim, H., Char, K., Cho, J., Klimov, V. I., Park, P., Lee, D. C., & Bae, W. K. (2016). Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking. ACS Nano, 10(10), 9297-9305. https://doi.org/10.1021/acsnano.6b03704