Power dependence of upconversion luminescence of Er³⁺ doped Yttria nanocrystals and their bulk counterpart

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• 作者：Lu Liu ; Haili Jiang ; Yujin Chen ; Xinlu Zhang ; Zhenguo Zhang ; Yuxiao Wang
• 关键词：Upconversion ; Er3+ ; Yttria ; Power dependence ; Rate equations
• 刊名：Journal of Luminescence
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：143
• 期：Complete
• 页码：423-431
• 全文大小：2742 K

文摘

We demonstrate upconversion spectra of Er³⁺ doped Y₂O₃ nanocrystals under different heat treating processes. After re-calcination, the intensity is enhanced by a factor of 18-56 at different Er³⁺ doping concentrations. This enhancement is attributed to the suppression of energy transfer from Er³⁺ to OH^?. The ln-ln pump power dependences of UC-PL intensity are separated by two regions with different slopes when Er³⁺ concentration exceeds to 0.5 mol % . In addition, the slopes are substantially unchanged by re-calcination. These phenomena are discussed by the rate equations model which mainly considers the effects of cross relaxation processes of Er³⁺, nonradiative decay processes between the neighbor energy levels, and variation of the incident pump power.