Experimental investigation on the upconversion mechanism of 754 nm NIR luminescence of Ho/Yb:Y2O3, Gd2O3 under 976 nm diode laserexcitation |
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| Authors: | Y Yu F Qin CB Zheng WW Cao |
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| Institution: | a Department of Physics, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
b Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, PA 16802, USA |
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| Abstract: | Upconversion (UC) spectra of Ho3+/Yb3+ codoped Y2O3, Gd2O3 bulk ceramics were obtained under the excitation of a 976 nm diode laser. Systematic experimental studies, including power dependence, luminescence lifetime, and the intensity ratio σ for the green to NIR emissions, were carried out in order to confirm the UC mechanism of Ho3+ ions. Our results demonstrated that the NIR emission was associated with the 5F4/5S2→5I7 transition of Ho3+ ions without the contribution of the 5I4→5I8 transition for Ho3+/Yb3+ codoped Y2O3 and Gd2O3 bulk ceramics. Additionally, population saturation in the 5I7 energy level had been observed in Ho3+/Yb3+ codoped Y2O3, Gd2O3 bulk ceramics. All experimental observations can be well explained by the steady-state rate equations. |
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| Keywords: | Upconversion Mechanism NIR ET |
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