Preparation and Photoluminescence Study of Er3+∶Y2O3 Transparent Ceramics
LUO Jun-ming1,2,LI Yong-xiu1,DENG Li-ping2
1. Research Center for Rare Earths & Micro/nano Functioned Materials,Nanchang University, Nanchang 330031, China 2. School of Materials Science and Engineering, Nanchang University of Aeronautical,Nanchang 330063, China
Abstract:Y2O3 acted as the matrix material, which was doped with different concentrations of Er3+,Er3+∶Y2O3 nanocrystalline powder was prepared by co-precipitation method,and Er3+∶Y2O3 transparent ceramics was fabricated by vacuum sintering at 1 700 ℃, 1×10-3 Pa for 8 h. By using the X-ray diffraction (D/MAX-RB),transmission electron microscopy(Philips EM420),automatic logging spectrophotometer(DMR-22), fluorescence analyzer ( F-4500) and 980 nm diode laser, the structural,morphological and luminescence properties of the sample were investigated. The results show that Er3+ dissolved completely in the Y2O3 cubic phase, the precursor was amorphous, weak diffraction peaks appeared after calcination at 400 ℃,and if calcined at 700 ℃, the precursor turned to pure cubic phase. With increasing the calcining temperature, the diffraction peaks became sharp quickly, and when the calcining temperature reached 1 100 ℃, the diffraction peaks became very sharp, indicating that the grains were very large. The particles of Er3+∶Y2O3 is homogeneous and nearly spherical, the average diameter of the particles is in the range of 40-60 nm after being calcined at 1 000 ℃ for 2 h. The relative density of Er3+∶Y2O3 transparent ceramics is 99.8%, the transmittance of the Er3+∶Y2O3 transparent ceramics is markedly lower than the single crystal at the short wavelength, but the transmittance is improved noticeably with increasing the wavelength, and the transmittance exceeds 60% at the wavelength of 1 200 nm. Excited under the 980 nm diode laser, there are two main up-conversion emission bands, green emission centers at 562 nm and red emission centers at 660 nm, which correspond to 4S3/2/2H11/2-4I15/2 and 4F9/2-4I15/2 radiative transitions respectively. By changing the doping concentrations of Er3+,the color of up-conversion luminescence can be tuned from green to red gradually. The luminescence intensity is not reinforce with the increase in the concentration, so the doping concentration of Er3+ should not exceed 2%. If the doping concentration of Er3+ exceeds the range, the concentration has very small effect on the improvement of luminescence intensity.
罗军明1,2,李永绣1,邓莉萍2. Er3+∶Y2O3透明陶瓷制备及发光性质研究[J]. 光谱学与光谱分析, 2008, 28(10): 2254-2257.
LUO Jun-ming1,2,LI Yong-xiu1,DENG Li-ping2. Preparation and Photoluminescence Study of Er3+∶Y2O3 Transparent Ceramics. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(10): 2254-2257.
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