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 journalArticle

41 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

Fingerprint

blinking
Quantum yield
Nanocrystals
Semiconductor quantum wells
unity
Photoluminescence
nanocrystals
quantum wells
photoluminescence
retarding
Solar concentrators
Lattice mismatch
spherical shells
concentrators
intermittency
room temperature
thermal stresses
Thermal stress
illuminating
Seed

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., ... 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

Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking. / Jeong, Byeong Guk; Park, Young Shin; Chang, Jun Hyuk; Cho, Ikjun; Kim, Jai Kyeong; Kim, Heesuk; Char, Kookheon; Cho, Jinhan; Klimov, Victor I; Park, Philip; Lee, Doh C.; Bae, Wan Ki.

In: ACS Nano, Vol. 10, No. 10, 25.10.2016, p. 9297-9305.

Research output: Contribution to journalArticle

Jeong, BG, Park, YS, Chang, JH, Cho, I, Kim, JK, Kim, H, Char, K, Cho, J, Klimov, VI, Park, P, Lee, DC & Bae, WK 2016, 'Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking', ACS Nano, vol. 10, no. 10, pp. 9297-9305. https://doi.org/10.1021/acsnano.6b03704
Jeong, Byeong Guk ; Park, Young Shin ; Chang, Jun Hyuk ; Cho, Ikjun ; Kim, Jai Kyeong ; Kim, Heesuk ; Char, Kookheon ; Cho, Jinhan ; Klimov, Victor I ; Park, Philip ; Lee, Doh C. ; Bae, Wan Ki. / Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking. In: ACS Nano. 2016 ; Vol. 10, No. 10. pp. 9297-9305.
@article{44d8616e372448b7b086dfae657c71e3,
title = "Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking",
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.",
keywords = "coherently strained heterostructure, critical thickness, misfit defect, near-unity photoluminescence quantum yield, spherical quantum well",
author = "Jeong, {Byeong Guk} and Park, {Young Shin} and Chang, {Jun Hyuk} and Ikjun Cho and Kim, {Jai Kyeong} and Heesuk Kim and Kookheon Char and Jinhan Cho and Klimov, {Victor I} and Philip Park and Lee, {Doh C.} and Bae, {Wan Ki}",
year = "2016",
month = "10",
day = "25",
doi = "10.1021/acsnano.6b03704",
language = "English",
volume = "10",
pages = "9297--9305",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "10",

}

TY - JOUR

T1 - Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking

AU - Jeong, Byeong Guk

AU - Park, Young Shin

AU - Chang, Jun Hyuk

AU - Cho, Ikjun

AU - Kim, Jai Kyeong

AU - Kim, Heesuk

AU - Char, Kookheon

AU - Cho, Jinhan

AU - Klimov, Victor I

AU - Park, Philip

AU - Lee, Doh C.

AU - Bae, Wan Ki

PY - 2016/10/25

Y1 - 2016/10/25

N2 - 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.

AB - 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.

KW - coherently strained heterostructure

KW - critical thickness

KW - misfit defect

KW - near-unity photoluminescence quantum yield

KW - spherical quantum well

UR - http://www.scopus.com/inward/record.url?scp=84993949348&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84993949348&partnerID=8YFLogxK

U2 - 10.1021/acsnano.6b03704

DO - 10.1021/acsnano.6b03704

M3 - Article

VL - 10

SP - 9297

EP - 9305

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

IS - 10

ER -