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Title: Multiple temperature effects on up-conversion fluorescences of Er{sup 3+}-Y b{sup 3+}-Mo{sup 6+} codoped TiO{sub 2} and high thermal sensitivity

We report multiple temperature effects on green and red up-conversion emissions in Er{sup 3+}-Y b{sup 3+}-Mo{sup 6+} codoped TiO{sub 2} phosphors. With increasing temperature, the decrease of the red emission from {sup 4}F{sub 9/2}→{sup 4}I{sub 15/2}, the increase of green emission from {sup 2}H{sub 11/2}→{sup 4}I{sub 15/2} and another unchanged green emission from {sup 4}S{sub 3/2}→{sup 4}I{sub 15/2} were simultaneously observed, which are explained by steady-state rate equations analysis. Due to different evolution with temperature of the two green emissions, higher thermal sensitivity of optical thermal sensor was obtained based on the transitions with the largest fluorescence intensity ratio. Two parameters, maximum theoretical sensitivity (S{sub max}) and optimum operating temperature (T{sub max}) are given to describe thermal sensing properties of the produced sensors. The intensity ratio and energy difference ΔE of a pair of energy levels are two main factors for the sensitivity and accuracy of sensors, which should be referred to design sensors with optimized sensing properties.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. School of Physics and Materials Engineering, Dalian Nationalities University, Dalian, 116600 (China)
  2. Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro (Portugal)
Publication Date:
OSTI Identifier:
22492312
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 8; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON IONS; DEUTERIUM; ENERGY LEVELS; ERBIUM IONS; FLUORESCENCE; MOLYBDENUM IONS; PHOSPHORS; SENSITIVITY; SENSORS; STEADY-STATE CONDITIONS; TEMPERATURE DEPENDENCE; TITANIUM OXIDES