Efficient Near-infrared Down-conversion Phosphor of Ce3+/Yb3+ Co-doped La3Ga5SiO14 and Its Spectral Structural Modulation
虞万军;龚兴红;秦皓然
a (College of Chemistry, Fuzhou University, Fuzhou 350116, China)
b (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China)
c (Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China)
Efficient Near-infrared Down-conversion Phosphor of Ce3+/Yb3+ Co-doped La3Ga5SiO14 and Its Spectral Structural Modulation
YU Wan-Jun;GONG Xing-Hong;QIN Hao-Ran
a (College of Chemistry, Fuzhou University, Fuzhou 350116, China)
b (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China)
c (Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China)
摘要A series of near-infrared (NIR) down-conversion phosphors of La3Ga5SiO14 (LGS):Ce3+/Yb3+ were synthesized via high-temperature solid-state reaction. Under excitation at 345 nm, the phosphors show strong NIR emission around 978 nm, which matches well with the optimal spectral response of crystalline silicon (c-Si) solar cells. The emission spectra and decay curves were used to demonstrate the energy transfer from Ce3+ to Yb3+. The energy transfer mechanism was discussed in detail, indicating that the energy transfer from Ce3+ to Yb3+ is dominated by a single photon process, and the energy transfer efficiency is up to 51%. In addition, La3Ga5-zAlzSiO14 (z = 0, 1, 2, 3):Ce3+/Yb3+ were also synthesized. The NIR emission intensity of La3Ga2Al3SiO14:1%Ce3+/5%Yb3+ is 4.6 times that of LGS:1%Ce3+/5%Yb3+, and the thermal relaxation was used to explain this phenomenon. The results show that La3Ga5-zAlzSiO14 (z = 0, 1, 2, 3):1%Ce3+/5%Yb3+ phosphors have the potential to increase the conversion efficiency of c-Si solar cells.
Abstract：A series of near-infrared (NIR) down-conversion phosphors of La3Ga5SiO14 (LGS):Ce3+/Yb3+ were synthesized via high-temperature solid-state reaction. Under excitation at 345 nm, the phosphors show strong NIR emission around 978 nm, which matches well with the optimal spectral response of crystalline silicon (c-Si) solar cells. The emission spectra and decay curves were used to demonstrate the energy transfer from Ce3+ to Yb3+. The energy transfer mechanism was discussed in detail, indicating that the energy transfer from Ce3+ to Yb3+ is dominated by a single photon process, and the energy transfer efficiency is up to 51%. In addition, La3Ga5-zAlzSiO14 (z = 0, 1, 2, 3):Ce3+/Yb3+ were also synthesized. The NIR emission intensity of La3Ga2Al3SiO14:1%Ce3+/5%Yb3+ is 4.6 times that of LGS:1%Ce3+/5%Yb3+, and the thermal relaxation was used to explain this phenomenon. The results show that La3Ga5-zAlzSiO14 (z = 0, 1, 2, 3):1%Ce3+/5%Yb3+ phosphors have the potential to increase the conversion efficiency of c-Si solar cells.
基金资助:This research was supported by the Ministry of Science and Technology of the People’s Republic of China (2016YFB0701002), Chinese Academy of Sciences (KFJ-STS-QYZX-069, XDB20000000) and Natural Science Foundation of Fujian Province (2019J01127)
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