Abstract

${{\rm Tm}^{3 +}}/{{\rm Ho}^{3 +}}$-codoped low silica calcium aluminosilicate (LSCAS) glasses were prepared and characterized using optical absorption, luminescence decay, and thermal lens techniques. The emission band at 2.0 µm exhibited an enhancement when the Ho concentration was increased. The luminescence quantum efficiency values were determined for both ${^3{\rm F}_4}$ and ${^5{\rm I}_7}$ levels of ${{\rm Tm}^{3 +}}$ and ${{\rm Ho}^{3 +}}$ ions, respectively. The high decrease of the quantum efficiency of the ${^3{\rm F}_4}$ (${{\rm Tm}^{3 +}}$) level for high ${{\rm Ho}^{3 +}}$ concentration evidenced efficient energy transfer processes from ${{\rm Tm}^{3 +}}$ to ${{\rm Ho}^{3 +}}$. The heat generated in the energy transfer processes were estimated via a thermal lens experiment, and a rate equation model was proposed to explain the obtained result. The experimental and estimated parameters with the proposed theoretical model are in good agreement. Finally, the results of this work suggest the ${{\rm Tm}^{3 +}}/{{\rm Ho}^{3 +}}$-codoped LSCAS is a promising material for applications using the emission around 2.0 µm that is of great interest for biomedical applications.

© 2021 Optical Society of America

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