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Photon cascade emission has been reported in Pr3+-doped SrAl12O19 system, providing a unique method for direct measuring the quantum efficiency of 3P0 in this material. The 1S0→1I6 fluorescence intensity can be taken as a measure of the initial 3P0 population. Thus the quantum efficiency of 3P0 can be calculated using the intensity ratio of the total emission from 3P0 and the emission of 1S0→1I6....
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