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

doi:10.1021/acsnano.6b03704

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

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

109 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 language	English
Pages (from-to)	9297-9305
Number of pages	9
Journal	ACS nano
Volume	10
Issue number	10
DOIs	https://doi.org/10.1021/acsnano.6b03704
Publication status	Published - 2016 Oct 25

Bibliographical note

Funding Information:
This research was financially supported by Korea Institute of Science and Technology (KIST, 2E26530), the Ministry of Trade, Industry & Energy (MOTIE, 10051541) and Korea Display Research Consortium (KDRC) support program for the development of future devices technology for display industry

Publisher Copyright:
© 2016 American Chemical Society.

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)

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10.1021/acsnano.6b03704

Cite this

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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}",

note = "Funding Information: This research was financially supported by Korea Institute of Science and Technology (KIST, 2E26530), the Ministry of Trade, Industry & Energy (MOTIE, 10051541) and Korea Display Research Consortium (KDRC) support program for the development of future devices technology for display industry Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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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

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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.

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KW - critical thickness

KW - misfit defect

KW - near-unity photoluminescence quantum yield

KW - spherical quantum well

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ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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