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The red and white Bi 4 Ge 3 O 12 (BGO) crystals had been grown by Vertical Bridgman (VB) method. The absorption and photoluminescence (PL) spectra of these BGO samples were measured. The red BGO shows a significant emission band peaking around 1490nm under 808nm laser diodes (LDs) excitation, and the white BGO exhibits a broadband emission under 940nm LDs excitation. X-ray...
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