Realization of Excitation Wavelength Independent Blue Emission of ZnO Quantum Dots with Intrinsic Defects

Hong Hee Kim; Yeonju Lee; Yun Jae Lee; Junkyeong Jeong; Yeonjin Yi; Cheolmin Park; Sang Youp Yim; Basavaraj Angadi; Keum Jin Ko; Jae Wook Kang; Won Kook Choi

doi:10.1021/acsphotonics.9b01587

Realization of Excitation Wavelength Independent Blue Emission of ZnO Quantum Dots with Intrinsic Defects

Hong Hee Kim, Yeonju Lee, Yun Jae Lee, Junkyeong Jeong, Yeonjin Yi, Cheolmin Park, Sang Youp Yim, Basavaraj Angadi, Keum Jin Ko, Jae Wook Kang, Won Kook Choi

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

19 Citations (Scopus)

Abstract

Ecofriendly cation metal oxide quantum dots (QDs) are one of the promising candidates to replace for QDs containing expensive indium (In) or hazardous Cd- and Pb-elements. Super-E_g excitation wavelength (λ_ex) dependent Zn_i-V_O complex defects related characteristic emissions of green, yellow, and orange-red from ZnO QDs are completely inhibited by reducing oxygen vacancies through the hybridization of Zn interstitials in ZnO QDs with antibonding O-states of graphene oxide (GO) QDs. Thus, only λ_ex independent violet-purple-blue (V-P-B) emission resulting from transitions among Frenkel pairs (Zn_i ⁰-V_Zn) and the defects Zn_i ⁰-O_i in ZnO-GO QDs with a high photoluminescence quantum yield (PLQY) of 92% is successfully achieved. White-light emission from PL QD-LEDs is achieved using a mixture of ZnO and ZnO-GO QDs with CIE (0.32, 0.34) excited by a UV LEDs chip (λ = 365 nm). Further, ZnO-GO QD-based deep-blue LEDs (λ = 438 nm) with luminance of 1980 cd/m², a luminous efficacy (LE) of 2.53 cd/A, and external quantum efficiency (EQE) of 2.78% with CIE (0.16, 0.11) are also realized.

Original language	English
Pages (from-to)	723-734
Number of pages	12
Journal	ACS Photonics
Volume	7
Issue number	3
DOIs	https://doi.org/10.1021/acsphotonics.9b01587
Publication status	Published - 2020 Mar 18

Bibliographical note

Funding Information:
Won Kook Choi gratefully acknowledges the financial support from both the KIST Institutional Program under Contract No. 2E28200 and the Ministry of Science and ICT, Midcareer Researcher Program under Contract No. NRF-2017R1A2B2008115.

Publisher Copyright:
© 2020 American Chemical Society.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Biotechnology
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

Access to Document

10.1021/acsphotonics.9b01587

Cite this

@article{3c8ef76752aa4e8197ea387f8265efde,

title = "Realization of Excitation Wavelength Independent Blue Emission of ZnO Quantum Dots with Intrinsic Defects",

abstract = "Ecofriendly cation metal oxide quantum dots (QDs) are one of the promising candidates to replace for QDs containing expensive indium (In) or hazardous Cd- and Pb-elements. Super-Eg excitation wavelength (λex) dependent Zni-VO complex defects related characteristic emissions of green, yellow, and orange-red from ZnO QDs are completely inhibited by reducing oxygen vacancies through the hybridization of Zn interstitials in ZnO QDs with antibonding O-states of graphene oxide (GO) QDs. Thus, only λex independent violet-purple-blue (V-P-B) emission resulting from transitions among Frenkel pairs (Zni 0-VZn) and the defects Zni 0-Oi in ZnO-GO QDs with a high photoluminescence quantum yield (PLQY) of 92% is successfully achieved. White-light emission from PL QD-LEDs is achieved using a mixture of ZnO and ZnO-GO QDs with CIE (0.32, 0.34) excited by a UV LEDs chip (λ = 365 nm). Further, ZnO-GO QD-based deep-blue LEDs (λ = 438 nm) with luminance of 1980 cd/m2, a luminous efficacy (LE) of 2.53 cd/A, and external quantum efficiency (EQE) of 2.78% with CIE (0.16, 0.11) are also realized.",

author = "Kim, {Hong Hee} and Yeonju Lee and Lee, {Yun Jae} and Junkyeong Jeong and Yeonjin Yi and Cheolmin Park and Yim, {Sang Youp} and Basavaraj Angadi and Ko, {Keum Jin} and Kang, {Jae Wook} and Choi, {Won Kook}",

note = "Funding Information: Won Kook Choi gratefully acknowledges the financial support from both the KIST Institutional Program under Contract No. 2E28200 and the Ministry of Science and ICT, Midcareer Researcher Program under Contract No. NRF-2017R1A2B2008115. Publisher Copyright: {\textcopyright} 2020 American Chemical Society.",

year = "2020",

month = mar,

day = "18",

doi = "10.1021/acsphotonics.9b01587",

language = "English",

volume = "7",

pages = "723--734",

journal = "ACS Photonics",

issn = "2330-4022",

publisher = "American Chemical Society",

number = "3",

}

TY - JOUR

T1 - Realization of Excitation Wavelength Independent Blue Emission of ZnO Quantum Dots with Intrinsic Defects

AU - Kim, Hong Hee

AU - Lee, Yeonju

AU - Lee, Yun Jae

AU - Jeong, Junkyeong

AU - Yi, Yeonjin

AU - Park, Cheolmin

AU - Yim, Sang Youp

AU - Angadi, Basavaraj

AU - Ko, Keum Jin

AU - Kang, Jae Wook

AU - Choi, Won Kook

N1 - Funding Information: Won Kook Choi gratefully acknowledges the financial support from both the KIST Institutional Program under Contract No. 2E28200 and the Ministry of Science and ICT, Midcareer Researcher Program under Contract No. NRF-2017R1A2B2008115. Publisher Copyright: © 2020 American Chemical Society.

PY - 2020/3/18

Y1 - 2020/3/18

N2 - Ecofriendly cation metal oxide quantum dots (QDs) are one of the promising candidates to replace for QDs containing expensive indium (In) or hazardous Cd- and Pb-elements. Super-Eg excitation wavelength (λex) dependent Zni-VO complex defects related characteristic emissions of green, yellow, and orange-red from ZnO QDs are completely inhibited by reducing oxygen vacancies through the hybridization of Zn interstitials in ZnO QDs with antibonding O-states of graphene oxide (GO) QDs. Thus, only λex independent violet-purple-blue (V-P-B) emission resulting from transitions among Frenkel pairs (Zni 0-VZn) and the defects Zni 0-Oi in ZnO-GO QDs with a high photoluminescence quantum yield (PLQY) of 92% is successfully achieved. White-light emission from PL QD-LEDs is achieved using a mixture of ZnO and ZnO-GO QDs with CIE (0.32, 0.34) excited by a UV LEDs chip (λ = 365 nm). Further, ZnO-GO QD-based deep-blue LEDs (λ = 438 nm) with luminance of 1980 cd/m2, a luminous efficacy (LE) of 2.53 cd/A, and external quantum efficiency (EQE) of 2.78% with CIE (0.16, 0.11) are also realized.

AB - Ecofriendly cation metal oxide quantum dots (QDs) are one of the promising candidates to replace for QDs containing expensive indium (In) or hazardous Cd- and Pb-elements. Super-Eg excitation wavelength (λex) dependent Zni-VO complex defects related characteristic emissions of green, yellow, and orange-red from ZnO QDs are completely inhibited by reducing oxygen vacancies through the hybridization of Zn interstitials in ZnO QDs with antibonding O-states of graphene oxide (GO) QDs. Thus, only λex independent violet-purple-blue (V-P-B) emission resulting from transitions among Frenkel pairs (Zni 0-VZn) and the defects Zni 0-Oi in ZnO-GO QDs with a high photoluminescence quantum yield (PLQY) of 92% is successfully achieved. White-light emission from PL QD-LEDs is achieved using a mixture of ZnO and ZnO-GO QDs with CIE (0.32, 0.34) excited by a UV LEDs chip (λ = 365 nm). Further, ZnO-GO QD-based deep-blue LEDs (λ = 438 nm) with luminance of 1980 cd/m2, a luminous efficacy (LE) of 2.53 cd/A, and external quantum efficiency (EQE) of 2.78% with CIE (0.16, 0.11) are also realized.

UR - http://www.scopus.com/inward/record.url?scp=85080894885&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85080894885&partnerID=8YFLogxK

U2 - 10.1021/acsphotonics.9b01587

DO - 10.1021/acsphotonics.9b01587

M3 - Article

AN - SCOPUS:85080894885

SN - 2330-4022

VL - 7

SP - 723

EP - 734

JO - ACS Photonics

JF - ACS Photonics

IS - 3

ER -

Realization of Excitation Wavelength Independent Blue Emission of ZnO Quantum Dots with Intrinsic Defects

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this