Enhanced green upconversion luminescence in ZnO:Er3+, Yb3+ on Mo6+ co-doping for temperature sensor application
Radhakrishnan Anjana1, Perumpallikkattil P Subha1, Markose K Kurias1
1Nanophotonic and optoelectronic devices laboratory, Department of Physics, Cochin University of Science and Technology, Kochi-682022, Kerala, India.
Abstract:
Erbium (Er) doped zinc oxide (ZnO) powder was prepared using co-precipitation method. Effect of ytterbium (Yb) and molybdenum (Mo) co-doping on upconversion emission was studied. The emission intensity has been enhanced on Yb co-doping due to energy transfer from Yb to Er. Co-doping Mo in ZnO:Er, Yb has brought a significant enhancement in green upconversion emission, when excited with 980 nm laser. The enhancement in green emission on Mo doping is because of the formation of [Formula: see text] dimer. Since ZnO is a material having high thermal stability, the enhanced green emission in Mo, Er, Yb doped ZnO can be used for temperature sensor applications. The variation in relative intensity ratio of 2H11/2 → 4I15/2,4S3/2 → 4I15/2 transition can be used to sense the sample temperature.
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