Spectral Properties and Energy Transfer of a Potential Solar Energy Converter

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• 作者：Lei Zhou ; Weijie Zhou ; Fengjuan Pan ; Rui Shi ; Lin Huang ; Hongbin Liang ; Peter A. Tanner ; Xueyan Du ; Yan Huang ; Ye Tao ; Lirong Zheng
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：April 26, 2016
• 年：2016
• 卷：28
• 期：8
• 页码：2834-2843
• 全文大小：770K
• 年卷期：0
• ISSN：1520-5002

文摘

The energy transfer between Ce³⁺ and Eu²⁺ has been investigated in the host Ca₃Sc₂Si₃O₁₂ (CSS), prepared by a modified sol–gel method. Excitation and emission measurements from the near-infrared to the vacuum ultraviolet spectral regions have been performed upon CSS, Ce³⁺-doped CSS, Eu²⁺-doped CSS and Ce³⁺, Eu²⁺-co-doped CSS, at various concentrations, including experiments at temperatures range of 15–460 K. The energy transfer efficiency from Ce³⁺ to Eu²⁺ can approach 90%, and the Ce³⁺ donor decay curves for different Eu²⁺ acceptor concentrations in the codoped system were fitted by the Inokuti–Hirayama method, indicating that it is energy transfer induced by electric dipole interaction. The use of the Ce³⁺, Eu²⁺ couple in the CSS host as a wideband harvester with an emission profile tailored to the response of the silicon solar cell in solar energy conversion suffers from two main drawbacks relating to valence instability and emission quenching of Eu²⁺. Possible solutions are suggested.