Abstract
The crystalline phase and optical properties of the NaZnPO4: Er3+/Yb3+/M (Li+/Ba2+) phosphors synthesized by conventional solid state reaction method, have been characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman spectra, Diffuse reflectance spectra and Photoluminescence spectra. The effect of co-doping with Yb3+ and non-lanthanide ions (Li+ and Ba2+) on the upconversion (UC) emission intensity has been investigated. The enhancement of about ~ 52 and ~ 132 times respectively in green and red emission bands has been found in the NaZnPO4: Er3+/Yb3+/Li+ phosphors compared to that of the NaZnPO4: Er3+ phosphors. The green colour emitted from the tri-doped phosphors show colour purity ~ 97%. No colour tuning with variation of pump power density in the developed phosphors has been reported. The overall UC emission intensity of the green band of tri-doped phosphors performed in water at ~ 4.0cm of penetration depth reduces to ~ 66% of its original value in the powder phosphors. The maximum sensor sensitivity of the Er3+- Yb3+- Li+ and Er3+- Yb3+- Ba2+ tri-doped phosphors have been obtained as ~ 6.46×10−3K−1 at 603K and ~ 4.32×10−3K−1 at 523K respectively.
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