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HU CHEN,YUNFEI LIU,YINONG LU,HONGMING WU,HAO QIAN,BAOSHUAI HUANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.4
The Eu3+-doped CdTe quantum dots (QDs) have been successfully synthesized in aqueous phase through microwave-assisted hydrothermal method. The as-prepared products were characterized by X-ray diffraction (XRD) technique, high-resolution transmission electron microscope (HRTEM), energy dispersive spectrum (EDS), X-ray photoclectron spectrum (XPS), UV-visble (UV-Vis) absorption spectrum and photoluminescence (PL). As the results show, the average sizes of the cubic phase CdTe and CdTe:1%Eu3+ are an average size of 3.7 nm and 3.5 nm, respectively. The average lattice parameter of CdTe:Eu3+ decreases with increasing Eu3+ ions concentration. Furthermore, compared to green emission of the host CdTe, the CdTe:1%Eu3+ presents additional orange fluorescence emission of Eu3+ ions. Recombination luminescence color is almost located in the yellow region of the CIE 1931, and the CIE 1931 coordinate is (0.448, 0.513). The effect of different Eu3+ doping concentration on the luminescence of CdTe:Eu3+ QDs was discussed in detail. It suggests that CdTe:Eu3+ QDs are potential phosphors for white light-emitting materials.