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We have prepared glasses with the composition of Cu-doped 30Li 3 PO 4-70Al(PO 3) 3 and investigated their luminescence characteristics. The glass samples were synthesized by the melt quenching method, and the Cu concentrations of the prepared samples were 0.1, 0.2, 0.5, and 1.0%. In the absorption spectrum, the absorptions due to Cu + and Cu 2+ around 290 and 850 nm were observed, respectively. The absorption due to Cu 2+ increased in proportion to the amount of Cu. In the photoluminescence (PL) decay curve, the PL decay time was a typical value of the 3d 9 4s 1-3d 10 transition of Cu + (~30 μs). The scintillation spectra showed a broad emission band from 400 to 600 nm, and the emission intensities were proportional to the Cu concentration.

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