Abstract

Er3+ doped powders are generally used for fluorescence-based temperature sensing application when near-infrared lasers are the excitation sources of choice. The fluorescence of Er3+ is produced by nonlinear (upconversion) processes, which generate strong internal heat. Lowering the excitation power causes drastic reduction of the fluorescence signal, and as a consequence the sensor applicability of Er3+ doped powders becomes compromised. Here we propose the use of the downconverted fluorescence of Yb3+ produced by efficient energy transfer from Nd3+ as an alternative temperature sensing system. Our results are presented for yttrium silicate powders prepared by combustion synthesis.

© 2014 Optical Society of America

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