Kim, Hong Hee Lee, Yeonju Lee, Yun Jae Jeong, Junkyeong Yi, Yeonjin Park, Cheolmin Yim, Sang-Youp Angadi, Basavaraj Ko, Keum-Jin Kang, Jae-Wook Choi, Won Kook 2024-01-19T18:01:32Z 2024-01-19T18:01:32Z 2021-09-05 2020-03-18 2330-4022 https://pubs.kist.re.kr/handle/201004/118846 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. English AMER CHEMICAL SOC LIGHT-EMITTING-DIODES HIGHLY LUMINESCENT HIGH-EFFICIENCY FULL-COLOR GRAPHENE PHOTOLUMINESCENCE NANOCRYSTALS GROWTH Realization of Excitation Wavelength Independent Blue Emission of ZnO Quantum Dots with Intrinsic Defects Article 10.1021/acsphotonics.9b01587 1 ACS PHOTONICS, v.7, no.3, pp.723 - 734 ACS PHOTONICS 7 3 723 734 scie scopus 000526350900024 2-s2.0-85080894885 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Optics Physics, Applied Physics, Condensed Matter Science & Technology - Other Topics Materials Science Optics Physics Article LIGHT-EMITTING-DIODES HIGHLY LUMINESCENT HIGH-EFFICIENCY FULL-COLOR GRAPHENE PHOTOLUMINESCENCE NANOCRYSTALS GROWTH ZnO-graphene oxide quantum dots photoluminescence quantum efficiency excitation independent deep blue light emission ecofriendly fluorescent materials Zn-i-V-O complex defects