Down-conversion from Er3+-Yb3+ codoped CaMoO4 phosphor: A spectral conversion to improve solar cell efficiency |
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| Affiliation: | 1. College of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, PR China;2. College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing, 400065, PR China;1. Department of Physics, University of the Free State, P.O Box 339, Bloemfontein 9300, South Africa;2. Department of Physics, University of the Free State, QwaQwa Campus, Private Bag X13, Phuthaditjhaba 9866, South Africa;1. School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong, 529020, PR China;2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China;3. University of Science and Technology of China, Hefei, 230026, PR China;1. Changchun University of Science and Technology, Changchun, 130022, China;2. Jilin Vocational College of Industry and Technology, Jilin, 132013, China;3. Liaoning Police College, Dalian, 116036, China;4. Changchun Normal University, Changchun, 130032, China |
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| Abstract: | The present paper focuses on near infrared (NIR) down-conversion photoluminescence (PL) properties by studying the energy transfer mechanism between Er3+ and Yb3+ in CaMoO4:Er3+, Yb3+ phosphors. We have successfully synthesized a series of Er3+ doped and Yb3+ codoped CaMoO4 phosphors by hydrothermal method. The down-conversion of Er3+-Yb3+ combination with CaMoO4 phosphor is designed to overcome the energy losses due to spectral mismatch when a high energy photon is incident on the Si-solar cell. The XRD, FESEM, EDX, PL, UV–Vis, Lifetime measurements were carried out to characterize the prepared down-converting phosphors. The crystallinity and surface morphology were studied by X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) techniques. The down-conversion PL spectra have been studied using 380 nm excitation wavelength. The Er3+ doped phosphors exhibit hypersensitive emission at 555 nm in the visible region due to 4S3/2→4I15/2 transition. The addition of Yb3+ into Er3+ doped CaMoO4 attribute an emission at 980 nm due to 2F5/2→2F7/2 transition. The decrease in emission intensity in visible region and increase in NIR region reveals the energy transfer from Er3+ to Yb3+ through cross relaxation. The UV–Vis–NIR spectra shows the strong absorption peak around 1000 nm due to Yb3+ ion. The lifetime measurement also reveals the energy transfer from Er3+ to Yb3+ ions. The maximum value of energy transfer efficiency (ETE) and corresponding theoretical internal quantum efficiency are estimated as 74% and 174% respectively. |
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| Keywords: | Rare-earth Phosphor Down-conversion Solar cell |
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