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Mg0:5Sr0:5FCl0:5Br0:5 mixed crystals containing Sm2+ were prepared by mixing MgF2, SrCl26H2O, SrBr26H2O and Sm2O3 in stoichiometric amounts and then heating the mixture for 1 hour at 1,100 C in owing hydrogen gas atmosphere. The optical properties of the samples were studied through emission spectroscopy and persistent spectral holeburning (PSHB). The emission spectrum due to the 5D1 ! 7F0 transition was shifted toward low energy with decreasing temperature. The PSHB was made by using a one-color or a two-color process at 300 K but by using a two-color process at 1.5 K.


Mg0:5Sr0:5FCl0:5Br0:5 mixed crystals containing Sm2+ were prepared by mixing MgF2, SrCl26H2O, SrBr26H2O and Sm2O3 in stoichiometric amounts and then heating the mixture for 1 hour at 1,100 C in owing hydrogen gas atmosphere. The optical properties of the samples were studied through emission spectroscopy and persistent spectral holeburning (PSHB). The emission spectrum due to the 5D1 ! 7F0 transition was shifted toward low energy with decreasing temperature. The PSHB was made by using a one-color or a two-color process at 300 K but by using a two-color process at 1.5 K.