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New upconversion phosphor BaCl/sub 2/ containing 28 mol.% Er/sup 3+/ exhibited extremely bright green luminescence and the fluorescence intensity of the chloride at 550 nm and under 1.516 mu m (5 mW) laser diode excitation was 40 times greater than that of conventional Er/sup 3+/-doped fluoride. The excitation spectrum and stability of the chloride phosphor are also reported.<<ETX>>
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