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

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


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
Issue number10
Publication statusPublished - Oct 25 2016


  • 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)

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