期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 231, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.118096
关键词
Mg and Ce co-doped ZnO; Luminescence; QDs; White LEDs
类别
资金
- National Natural Science Foundation of China [61775089]
- Shandong ProvincialNatural Science Foundation of China [ZR2018MA039, ZR2019MF068, ZR2017BF009, ZR2018MA036]
- Projects of Shandong Province Higher Educational Science and Technology Program [J17KA175]
- Industrial Alliance Fund of Shandong Provincial Key Laboratory [SDKL2016038]
- Experimental Technology Research Fund of Liaocheng University [26322170234]
- Special Construction Project Fund for Shandong Province Taishan Scholars
In this study, a simple low-temperature route is presented for the synthesis of Mg and Ce co-doped ZnO quantum dots (QDs). X-ray diffraction, transmission electron microscopy, electron paramagnetic resonance, X-ray photoelectron spectroscopy, UV-vis absorption spectra, and fluorescence measurements were used to characterize the synthesized QDs. The results indicate that the oxygen vacancy concentration could be tuned via Mg and Ce ions doping, which leads to the regulation of luminescence. The visible emission was directly associated with oxygen vacancies, and a blue shift of the visible emission with inaeasing Ce doping concentration was due to the quantum confinement effect. Finally, we explored the application of Mg and Ce co-doped ZnO QDs by fabricating a white LED device. Notably, the white LED device presents good luminescence properties under a voltage of 3 V and a driven current of 200 mA. The Commission International de l'Eclairage chromaticity, the correlated color temperature, and the color rendering index were determined to be (x = 0.32,y = 030), 5733 K, and 81, respectively, which make them potential candidates as single-phased QDs for white light-emitting diodes. (C) 2020 Elsevier B.V. All rights reserved.
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