4.6 Article

980 nm excited Er3+/Yb3+/Li+/Ba2+: NaZnPO4 upconverting phosphors in optical thermometry

Journal

JOURNAL OF LUMINESCENCE
Volume 187, Issue -, Pages 368-377

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2017.03.035

Keywords

Phosphor; Luminescence; Fluorescence intensity ratio; Optical temperature sensor

Categories

Funding

  1. SERB-DST, New Delhi, India [EMR/2014/001273]
  2. IIT (ISM), Dhanbad

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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 Ba (2+)) on the upconversion (UC) emission intensity has been investigated. The enhancement of about similar to 52 and similar to 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: Era(3+) phosphors. The green colour emitted from the tri-doped phosphors show colour purity similar to 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 similar to 4.0 cm 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+- Ba (2+) tri-doped phosphors have been obtained as similar to 6.46 x 10(-3) K-1 at 603 K and similar to 4.32 x 10(-3) K-1 at 523 K respectively. (C) 2017 Elsevier B.V. All rights reserved.

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