Abstract
For trivalent praseodymium (Pr3+) and quadrivalent praseodymium (Pr4+) codoped CaMO4 (M = W, Mo) powders, the luminescence propriety of matrix is obviously influenced by carrier concentration. The light emission intensity of CaWO4 matrix decreases exponentially with increasing of Pr concentration because oxygen-deficient ( $\mathrm{WO}_{3}\cdot V_{\mathrm{O}}^{\bullet \bullet}$ ) obtains an electron supplied by Pr3+ (5d). However, the light emission intensity of CaMoO4 is enhanced by Pr codoping because the quasi-free electrons increase the probability of radiative combination. The difference of photoluminescence properties in the two materials are attributed to the bonding character of M and O in the CaMO4 structure.
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