One-step Hydrothermal Synthesis of Copper Doped Carbon Dots and Their Application in White Light Devices†

doi:10.7503/cjcu20190182

Abstract

Abstract:

Copper doped carbon dots(Cu-CDs) were synthesized with aniline and copper acetate as raw materials. Through the optimization of experimental parameters, the optimal reaction time, reaction temperature and molar ratio of raw materials for Cu-CDs synthesis were 5 h, 210 ℃ and 1∶1, respectively. Comparing with the control group under the same conditions, it is found that the doping of Cu significantly improves the fluorescence intensity of CDs and achieves good multicolor luminescence performance. Cu-CDs can directly emit strong white light under 365 nm ultraviolet excitation. The white light emitting device is obtained with chromaticity coordinates of (0.337, 0.337) by further combining Cu-CDs with the ultraviolet light emitting diode(LED) chip. This method of preparing Cu-CDs materials in large quantity and its outstanding white light emitting performance have broaden the application of carbon dots in light emitting devices.

Key words: Copper doped carbon dots, Hydrothermal method, Polycondensation reaction, White light device

CLC Number:

O631

TrendMD:

DONG Xiangyang,NIU Xiaoqing,WEI Jishi,XIONG Huanming. One-step Hydrothermal Synthesis of Copper Doped Carbon Dots and Their Application in White Light Devices^†[J]. Chem. J. Chinese Universities, 2019, 40(6): 1288.

Figures/Tables 8

Fig.1 TEM image of Cu-CDs Inset: particle size distribution.

Fig.2 HRTEM image of Cu-CDs

Fig.3 FTIR spectrum of the Cu-CDs

Fig.4 XPS spectrum of the Cu-CDs

Fig.5 UV-Vis absorption spectra of Cu-CDs(a) and CDs(b) in ethanol

Fig.6 Normalized fluorescence emission spectra of the Cu-CDs dispersed in ethanol under different wavelengths of excitation light λex /nm: a. 400; b. 440; c. 480; d. 520.

Fig.7 Fluorescence emission spectrum of Cu-CDs dispersed in ethanol under excitation light of 365 nm Inset: photograph of Cu-CDs dried on a glass sheet.

Fig.8 CIE chromaticity coordinates of the WLED fabricated by integrating 365 nm UV chip with Cu-CDs Inset: photograph of the WLEDs.

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