Infrared to visible upconversion luminescence in Er/Yb co-doped CeO2 inverse opal |
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Authors: | Zhengwen Yang Hangjun WuJiayan Liao Wucai LiZhiguo Song Yong YangDacheng Zhou Rongfei WangJianbei Qiu |
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Affiliation: | Key Lab of Advanced Materials in Rare & Precious and Non-ferrous Metals, Ministry of Education, Key Laboratory of Advanced Materials of Yunnan Province, College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China |
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Abstract: | Infrared to visible upconversion luminescence has been investigated in Er3+/Yb3+ co-doped CeO2 inverse opal. Under the excitation of 980 nm diode lasers, visible emissions centered at 525, 547, 561, 660 and 680 nm are observed, which are assigned to the Er3+ transitions of 2H11/2 → 4I15/2 (525 nm), 4S3/2 → 4I15/2 (547, 561 nm), 4F9/2 → 4I15/2 (660 and 680 nm), respectively. The effect of photonic band gap on the upconversion luminescence intensity was also obtained. Additionally, the upconversion luminescence mechanism was studied. The dependence of Er3+ upconversion emission intensity on pump power reveals that it is a two-photon excitation process. |
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Keywords: | Upconversion CeO2 Mechanism Inverse opal |
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