Journal
ACS PHOTONICS
Volume 7, Issue 3, Pages 723-734Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b01587
Keywords
ZnO-graphene oxide quantum dots; photoluminescence quantum efficiency; excitation independent deep blue light emission; ecofriendly fluorescent materials; Zn-i-V-O complex defects
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Funding
- KIST Institutional Program [2E28200]
- Ministry of Science and ICT, Midcareer Researcher Program [NRF-2017R1A2B2008115]
- Ministry of Science & ICT (MSIT), Republic of Korea [2E28200] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [31Z20130012940] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 (lambda(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 lambda(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 (lambda = 365 nm). Further, ZnO-GO QD-based deep-blue LEDs (lambda = 438 nm) with luminance of 1980 cd/m(2), 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.
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