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|Type:||Artigo de evento|
|Title:||Photothermal Spectroscopic Characterization In Teliurite Glasses Codoped With Rare-earth Ions|
|Abstract:||Thermal Lens (TL) and spectroscopic characterizations were performed in 70TeO2-19WO3-7Na2O-4Nb2O 5 (mol%) tellurite glasses. TL measurements were accomplished in Er3+/Tm3+ co-doped tellurite glasses in function of the Tm2O3 concentration (0.4 -1.6 ×1020 ions/cm3). Fluorescence spectra at 488 nm showed that Er 3+/Tm3+co-doped tellurite glasses present several emission bands between (500-1800) nm. However, the more iniense emission bands correspond to the Er3+ and Tm3+ transitions ( 4I13/2 → 4I15/2 and 3F4 → 3H6), respectively. The absolute nonradiative quantum efficiency (φ) was determined by TL method. Higher values of φ were obtained with the increase of Tm2O 3 concentration inside of the Er3+/Tm3+ co-doped tellurite glasses. These results are corroborated by the Judd-Ofelt calculations.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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