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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