Journal
OPTICAL MATERIALS
Volume 58, Issue -, Pages 432-438Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2016.06.010
Keywords
Lanthanides; Downshifting; Upconversion; Energy transfer; Temperature sensing
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Funding
- UGC, India
- DST project [SR/S2?LOP/0023/2012]
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Ho3+/Yb3+ codoped Gd2O3 phosphor has been synthesized by solution combustion method. The concentrations of Ho3+ and Yb3+ were optimized to be 0.3 and 2.0 mol% respectively for maximum emission intensity. The effect of Li+ ion co-doping on phase structure and photo luminescence were investigated. It is found that there is no change in phase of the sample due to Li+ ion co-doping. However the Upconversion (UC) and Downshifting (DS) emission show a remarkable enhancement in intensity. It is concluded that, this enhancement in the emission intensity is mainly due to the change in crystal field around the Ho3+ ion and reduction in quenching centers. The optimum doping concentration of Li+ ion was found to be 20 mol%. We have further explored the temperature sensing behavior using the FIR technique. The maximum sensitivity is found to be 0.0092 K-1 at 505 K. (C) 2016 Elsevier B.V. All rights reserved.
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