کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5400226 | 1505915 | 2014 | 5 صفحه PDF | دانلود رایگان |
- We report on spectroscopic studies and downconversion luminescence in OHâ-free Pr3+-Yb3+ co-doped low-silica calcium aluminosilicate glasses.
- The dependencies of downconversion properties and photoacoustic signals on the Yb2O3 concentration provided new insights on energy transfer Pr3+âYb3+.
- The results confirmed the occurrence of downconversion, followed by a back-energy transfer mechanism Yb3+âPr3+ and multiphonon relaxations in Pr3+.
We report on spectroscopic studies and downconversion luminescence in OHâ-free Pr3+-Yb3+ co-doped low-silica calcium aluminosilicate glasses (LSCAS). The dependencies of the visible to near-infrared emissions, photoacoustic signals, luminescence decay times and energy transfer efficiencies from Pr3+âYb3+ on the doped Yb2O3 concentration were investigated. The results confirmed the occurrence of downconversion processes in the examined samples, followed by a back-energy transfer mechanism from the Yb3+:2F5/2 level to the Pr3+:1G4 level, from where the multiphonon relaxations through the 1G4,3F4â3H4 transitions occurred. The photoacoustic data provided evidence of the energy transfer that resulted in heat generation in the sample, confirming the observations provided by the luminescence data. The energy transfer mechanisms that are involved in the Pr3+:Yb3+ co-doped LSCAS glasses are discussed.
Journal: Journal of Luminescence - Volume 145, January 2014, Pages 615-619