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The visible luminescence of Pr 3+ -doped lead germanate glass of composition (in mol%) 60PbO-40GeO 2 has been investigated for two Pr 3+ concentrations at different temperatures by using steady-state and time-resolved laser spectroscopy. Concentration quenching of the 1 D 2 emission is observed for Pr 3+ concentrations higher than x = 0.05 mol% even at 4.2 K and attributed to a cross relaxation process. Anti-Stokes emission from the 3 P 0 level following excitation of the 1 D 2 state has been observed for the sample doped with 0.5 mol% of Pr 3+ . The temporal behaviour of the anti-Stokes emission from the 3 P 0 level following excitation of the 1 D 2 state suggests that energy transfer is responsible for the upconversion process.
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Balda et al. (1999) studied this question.
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