Luminescent carbon quantum dots with high quantum yield as a single white converter for white light emitting diodes
Luminescent carbon quantum dots with high quantum yield as a single white converter for white light emitting diodes
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DOI：
10.1063/1.4936234
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发表时间：
2015-11-23
影响因子：
4
通讯作者：
Liu, X. G.
中科院分区：
文献类型：
--
作者：
Feng, X. T.;Zhang, F.;Liu, X. G.
以硫代水杨酸和乙二胺为前驱体，采用一步水热法制备了量子产率高达51.4%的碳量子点（CQDs）。CQDs的平均直径为2.3 nm，发射波长在320 ~ 440 nm之间，与激发无关。在紫外（UV）激发下，CQDs水溶液直接发射出明亮的蓝色荧光，且发射范围广，光谱成分比高达67.4%（蓝红强度占总强度）。我们使用UV-LED芯片作为激发光源，将CQDs作为白光发光二极管（wled）的单一白光转换器。该WLED的色温为5227K，色坐标为（0.34,0.38），属于白色色域。(C) 2015 AIP出版有限责任公司
Carbon quantum dots (CQDs) with high quantum yield (51.4%) were synthesized by a one-step hydrothermal method using thiosalicylic acid and ethylenediamine as precursor. The CQDs have the average diameter of 2.3 nm and possess excitation-independent emission wavelength in the range from 320 to 440 nm excitation. Under an ultraviolet (UV) excitation, the CQDs aqueous solutions emit bright blue fluorescence directly and exhibit broad emission with a high spectral component ratio of 67.4% (blue to red intensity to total intensity). We applied the CQDs as a single white-light converter for white light emitting diodes (WLEDs) using a UV-LED chip as the excitation light source. The resulted WLED shows superior performance with corresponding color temperature of 5227K and the color coordinates of (0.34, 0.38) belonging to the white gamut. (C) 2015 AIP Publishing LLC.