光谱学与光谱分析 |
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Upconversion Luminescence of Er3+-Doped Yttrium-Stabilized Zirconia Powders |
XU Bin, ZHOU Yong-qiang*, WANG He, CAO Li-li |
School of Chemical and Materials Engineering, Wenzhou University, Wenzhou 325035, China |
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Abstract Er3+-doped yttrium-stabilized zirconia upconversion powders Zr0.92-xY0.08O1.96-0.5x:xEr3+(x=0.001~0.11)were synthesized via chemical coprecipitation method at 1 200 ℃ for 3 hours. Phase structure and upconversion luminescence spectra of the samples were characterized by X-ray diffractometer and fluorescence spectrometer, respectively. The proposed upconversion mechanism of the samples was discussed. The results indicate that good crystallinity cubic ZrO2 solid solution can be stabilized by introducing 8 mol% yttrium ions. Size and valent differences between trivalent Y3+ and quadrivalent Zr4+ ions generate asymmetry and oxygen vacancies, which contribute to the stability of upconversion luminescence properties and luminescence intensity increase of the samples, and expand its practical application fields. Under 980nm excitation, the samples emit green light centered at 539 nm(2H11/2→4I15/2), 552 nm(4S3/2→4I15/2) and red light at 656 and 680 nm (4F9/2→4I15/2). When Er3+ doping concentration (0.1 mol%) is low, the main green emission of samples is ascribed to the excited state absorption (ESA) processes; With the Er3+concentration increases from 0.1% to 11 mol%, there exist three cross relaxation (CR) processes: 2H11/2+4I15/2→4I9/2+4I13/2, 4F7/2+4I11/2→2 4F9/2 and 4I15/2+4I9/2→2 4I13/2, causing that the red emissions increase markedly whereas the green emissions decrease. When Er3+ doping concentration(9 mol%) is high, the sample mainly presents red luminescence due to the dominated CR processes in upconversion process.
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Received: 2013-12-03
Accepted: 2014-03-24
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Corresponding Authors:
ZHOU Yong-qiang
E-mail: zhouyongqiang66@163.com
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