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Single-phased emission-tunable Mg and Ce co-doped ZnO quantum dots for white LEDs.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.saa.2020.118096 Qiang Shi 1 , Kai Ling 2 , Susu Duan 2 , Xue Wang 2 , Shengxiang Xu 2 , Dong Zhang 1 , Qingru Wang 1 , Shuhong Li 1 , Ling Zhao 1 , Wenjun Wang 1
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.saa.2020.118096 Qiang Shi 1 , Kai Ling 2 , Susu Duan 2 , Xue Wang 2 , Shengxiang Xu 2 , Dong Zhang 1 , Qingru Wang 1 , Shuhong Li 1 , Ling Zhao 1 , Wenjun Wang 1
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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 increasing 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 = 0.30), 5733 K, and 81, respectively, which make them potential candidates as single-phased QDs for white light-emitting diodes.
中文翻译：
用于白光LED的单相发射可调Mg和Ce共掺杂的ZnO量子点。
在这项研究中，提出了一种简单的低温路线，用于合成Mg和Ce共掺杂的ZnO量子点（QDs）。X射线衍射，透射电子显微镜，电子顺磁共振，X射线光电子能谱，紫外可见吸收光谱和荧光测量被用来表征合成的量子点。结果表明，可以通过掺杂Mg和Ce离子来调节氧空位浓度，从而导致发光的调节。可见光发射与氧空位直接相关，并且随着Ce掺杂浓度的增加，可见光发射的蓝移归因于量子约束效应。最后，我们通过制造白色LED器件探索了Mg和Ce共掺杂ZnO QD的应用。值得注意的是 白色LED器件在3 V电压和200 mA驱动电流下具有良好的发光特性。国际照明委员会的色度，相关色温和显色指数分别确定为（x = 0.32，y = 0.30），5733 K和81，这使其成为单相的潜在候选者白色发光二极管的QD。
更新日期：2020-01-23
中文翻译：
用于白光LED的单相发射可调Mg和Ce共掺杂的ZnO量子点。
在这项研究中，提出了一种简单的低温路线，用于合成Mg和Ce共掺杂的ZnO量子点（QDs）。X射线衍射，透射电子显微镜，电子顺磁共振，X射线光电子能谱，紫外可见吸收光谱和荧光测量被用来表征合成的量子点。结果表明，可以通过掺杂Mg和Ce离子来调节氧空位浓度，从而导致发光的调节。可见光发射与氧空位直接相关，并且随着Ce掺杂浓度的增加，可见光发射的蓝移归因于量子约束效应。最后，我们通过制造白色LED器件探索了Mg和Ce共掺杂ZnO QD的应用。值得注意的是 白色LED器件在3 V电压和200 mA驱动电流下具有良好的发光特性。国际照明委员会的色度，相关色温和显色指数分别确定为（x = 0.32，y = 0.30），5733 K和81，这使其成为单相的潜在候选者白色发光二极管的QD。
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