Energy Transfer Studies in Tb<sup>3+</sup>-Yb<sup>3+</sup> Co-Doped Phosphate Glasses
Detailed optical properties of Tb<sup>3+</sup>-Yb<sup>3+</sup> co-doped phosphate glasses were performed based on their emission spectra and decay measurements. Under blue excitation of Tb<sup>3+</sup> at 488 nm, the intensity of Yb<sup>3+</sup> emissi...
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| Main Authors: | , , , , |
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| Format: | article |
| Language: | EN |
| Published: |
MDPI AG
2021
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| Subjects: | |
| Online Access: | https://doaj.org/article/96e365e531374ced8d7f904b2e20fd96 |
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| Summary: | Detailed optical properties of Tb<sup>3+</sup>-Yb<sup>3+</sup> co-doped phosphate glasses were performed based on their emission spectra and decay measurements. Under blue excitation of Tb<sup>3+</sup> at 488 nm, the intensity of Yb<sup>3+</sup> emissions gradually enhanced upon increasing the Yb<sup>3+</sup> content until 1 mol% indicated an energy transfer from Tb<sup>3+</sup> to Yb<sup>3+</sup>. Otherwise, under near infrared excitation of Yb<sup>3+</sup> at 980 nm, these glasses exhibit intense green luminescence, which led to cooperative sensitization of the <sup>5</sup>D<sub>4</sub> level of Tb<sup>3+</sup> ions. A cooperative energy transfer mechanism was proposed on the basis of the study on the influence of Yb<sup>3+</sup> concentration on up-conversion emission intensity, as well as the dependence of this up-conversion intensity on near infrared excitation power. Moreover, the temporal evolution of the up-conversion emissions have been studied, which was in positive agreement with a theoretical model of cooperative up-conversion luminescence that showed a temporal emission curve with rise and decay times of the involved levels. |
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