Enhanced Red Up-conversion Emission of Lu3+Doped Na5 Y9 F32∶Ho3+/Yb3+/Ce3+Single Crystal and Optical Temperature Sensing Performance
Lu3+(mole fraction 0,0.6%,1.2%,1.8%)doped Na5Y9F32∶Ho3+/Yb3+/Ce3+single crystals were grown using a sealed Bridgman method.When excited by 980 nm LD,up-conversion emissions at 543 nm(5S2/5F4→5I8),656 nm(5F5→5I8)in red,and 750 nm(5S2/5F4→5I7)in near-infrared were observed.The two-photon transition pro-cesses leading to these emissions were identified by analyzing changes in luminescence intensities with varying excita-tion light intensities.Furthermore,the impact of Lu3+ion doping concentration on both up-conversion luminescence intensity and fluorescence lifetime was investigated.The 656 nm red emission in the crystal was gradually enhanced as the Lu3+doping concentration increased from 0 to 1.8%.Conversely,the green emission at 543 nm and near-infra-red at 750 nm decreased.The ratio between red and green intensity increased from 0.01 to 1.55,while the fluores-cence lifetime of 543 nm decreased from 1.29 ms to 0.99 ms.The incorporation of Lu3+ions replaces the lattice sites of Y3+ions,altering the local field environment of the crystal,resulting in changes in the up-conversion lumines-cence.The maximum absolute sensitivity and relative sensitivity of 1.8%Lu3+doped Na5Y9F32∶Ho3+/Yb3+/Ce3+single crystal in the range of 298-448 K were 0.242%·K-1 and 0.217%·K-1,respectively.
Na5Y9F32 single crystalenhanced red up-conversion emissionHo3+/Yb3+/Ce3+optical temperature sensingenergy transfer
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