Ultraviolet upconversion luminescence of Gd from Ho and Gd codoped oxide ceramic induced by 532-nm CW laser excitation |
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Authors: | Feng Qin Yangdong Zheng Changbin Zheng Zhiguo Zhang Wenwu Cao |
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Institution: | a Department of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of Chinab The Laboratory of Sono- and Photo-theranostic Technologies, Harbin Institute of Technology, Harbin 150001, People's Republic of Chinac Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, United States |
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Abstract: | Ultraviolet upconversion emissions around 314 nm from 6PJ states of Gd3+ ions have been observed in Y1.98 − xGdxHo0.02O3 (x = 0.02, 0.10, 0.20, and 0.30) oxide ceramics under the excitation of a continuous-wave 532-nm laser. We found that the energy transfer process from Ho3+ to Gd3+ plays an important role in populating the 6PJ states of Gd3+. The doping of Gd3+ ions does not affect 5G4 and 5G5 states but only the 3D3 state of Ho3+. The emissions from 3D3 state decrease with the increase of Gd3+ concentration. Power dependence curves and time-resolved spectra have been measured to identify the proposed upconversion mechanism. |
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Keywords: | Ultraviolet upconversion Gd3+ Energy transfer |
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