13 April 2000 Up-conversion cooperative radiation fluorescence oriented from a kind of couple state of cluster
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Proceedings Volume 3942, Rare-Earth-Doped Materials and Devices IV; (2000) https://doi.org/10.1117/12.382873
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
Abstract
This paper reports a quite interesting 474 nm up-conversion fluorescence when ErYb co-doped oxyfluoride glass is excited by 966 nm-diode laser. It was found that the 474 nm fluorescence is two-photon fluorescence. It can be found also that 474 nm fluorescence is posited between 490.5 nm 4F7/2 yields 4I15/2 and 454.0 nm 4F5/2 yields 4I15/2 fluorescence transition, and cannot be the transition from high excited state to first excited state of Er3+ ion also. In brief, the 474 nm fluorescence must be an extraordinary up-conversion fluorescence of ErYb co-doped oxyfluoride glass. In fact, it is reasonable entirely to believe that this is cooperative radiation fluorescence oriented from a kind of Couple State of two Yb3+ ions' cluster. The up-conversion processes are as follows: First each isolating Yb3+ ion absorbs pumping photon energy and is excited to 2F5/2 state from 2F7/2 ground state. Then two Yb3+ ions, which are both in 2F5/2 excited state, form a kind of Couple State of cluster (formula available in paper). And then the 474 nm fluorescence would be radiated from excited state (formula available in paper) of cluster's Couple State to its ground state (formula available in paper). The similar mechanism has not been reported internationally up to now.
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Xiaobo Chen, Xiaobo Chen, Guangyin Zhang, Guangyin Zhang, N. Sawanobori, N. Sawanobori, Yinguan Sun, Yinguan Sun, Meixian X. Li, Meixian X. Li, } "Up-conversion cooperative radiation fluorescence oriented from a kind of couple state of cluster", Proc. SPIE 3942, Rare-Earth-Doped Materials and Devices IV, (13 April 2000); doi: 10.1117/12.382873; https://doi.org/10.1117/12.382873
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