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CollegeofMaterialsScienceandEngineering,ChinaJiliangUniversity,Hangzhou310018,ChinaKeyLaboratoryofMa
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In this work, we investigate a new type of fluoride glasses modified by Al(PO3)3 with various Tm3 /Ho3 doping concentrations. The introduced PO3 plays an effective role in improving the glass-forming ability and thermal stability. Besides, 1.47, 1.8, and 2.0 μm emissions originating from Tm3 and Ho3 , respectively, are observed. The spectroscopic properties and energy transfer mechanisms between Tm3 and Ho3 are analyzed as well. It is noted that the higher predicted spontaneous transition probability (118.74 s 1) along with the larger product of measured decay lifetime and the emission cross section (σemi×τ) give evidence of intense 2.0 μm fluorescence.
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