Abstract

A quantum cutting mechanism for the sublinear near-IR power dependence property in ${\mathrm{Tb}}^{3+}–{\mathrm{Yb}}^{3+}$ codoped ${\mathrm{NaYF}}_4$ powders were investigated both experimentally and theoretically. The slopes of ${\mathrm{Yb}}^{3+}$ luminescence intensity versus excitation power were fitted to be between 0.5 and 1. We have developed a quantum cutting rate equation model to explain the anomalous sublinear phenomenon and an assessment factor was introduced to help understand the physical mechanism. Experimental results showed that the linear downconversion process combined with second-order nonlinear process induced the sublinear power dependence property with the latter to be the dominant process.

©2012 Optical Society of America

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