Optimal nitrogen and phosphorus codoping carbon dots towards white light-emitting device
Optimal nitrogen and phosphorus codoping carbon dots towards white light-emitting device
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DOI：
10.1063/1.4961631
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发表时间：
2016-08-22
影响因子：
4
通讯作者：
Liu, Xuguang
中科院分区：
文献类型：
--
作者：
Zhang, Feng;Wang, Yaling;Liu, Xuguang
通过一步快速微波辅助方法，以柠檬酸铵（AC）为碳源，磷酸盐为添加剂合成了氮磷共掺杂碳点（N,P-CD）。在最佳反应时间140 s的条件下，进一步探讨了不同N、P含量的添加剂对N、P-CDs荧光性能的影响。结果表明，高氮含量和中等磷含量是获得高量子产率（QY）的N、P-CDs所必需的，其中TAP-CDs（使用磷酸铵作为添加剂合成的CDs）表现出高达62%的量子产率（QY）和51.67%的红绿蓝（RGB）光谱组成。此外，TAP-CDs在180℃内表现出令人满意的热稳定性。利用TAP-CDs良好的光学和热性能，将紫外芯片与TAP-CDs作为荧光粉结合，制备了白光发光器件（LED）。白光LED发出明亮的暖白光，CIE色品坐标为（0.38，0.35），相应的色温（CCT）为4450K，表明TAP-CD荧光粉在白光LED中的潜力。由 AIP 出版社出版。
Through a one-step fast microwave-assisted approach, nitrogen and phosphorus co-doped carbon dots (N,P-CDs) were synthesized using ammonium citrate (AC) as a carbon source and phosphates as additive reagent. Under the condition of an optimal reaction time of 140 s, the influence of additive with different N and P content on fluorescent performance of N, P-CDs was further explored. It was concluded that high nitrogen content and moderate phosphorus content are necessary for obtaining high quantum yield (QY) N, P-CDs, among which the TAP-CDs (CDs synthesized using ammonium phosphate as additive reagent) show high quantum yield (QY) of 62% and red-green-blue (RGB) spectral composition of 51.67%. Besides, the TAP-CDs exhibit satisfying thermal stability within 180 degrees C. By virtue of good optical and thermal properties of TAP-CDs, a white light-emitting device (LED) was fabricated by combining ultraviolet chip with TAP-CDs as phosphor. The white LED emits bright warm-white light with the CIE chromaticity coordinate of (0.38, 0.35) and the corresponding color temperature (CCT) of 4450K, indicating the potential of TAP-CDs phosphor in white LED. Published by AIP Publishing.