Effect of Doping Concentration and Excitation Power on Upconversion and Temperature Sensitivity of Gd3Ga5O12:Yb3+/Er3+ Phosphors

Authors : Hümeyra ÖRÜCÜ

Pages : 237-245

Doi:10.7240/jeps.1240654

View : 55 | Download : 32

Publication Date : 2023-07-03

Article Type : Research Paper

Abstract :Yb/Er codoped Gd3Ga5O12 nanocrystalline upconverting phosphors were produced by the sol-gel pechini method at 1000 °C annealing temperature. The phosphor structure, morphological features, and luminescent properties of the fabricated material were studied using X-ray diffraction insert ignore into journalissuearticles values(XRD);, transmission electron microscopy insert ignore into journalissuearticles values(TEM);, high-resolution TEM insert ignore into journalissuearticles values(HR-TEM);, and photoluminescence measurements insert ignore into journalissuearticles values(PL);. Upconversion luminescence characteristics were investigated in the range of 450-850 nm by a 975 nm laser source. Emission, optical, and theoretical thermal behaviors were analyzed with respect to Er3+ ion content and the increasing excitation power. Temperature sensitivity calculations based on the fluorescence intensity ratio were performed by employing the thermally-coupled levels of Er3+. The maximum sensitivity was calculated with the optimal value of 0.83x10-2 K-1 for Gd3Ga5O12:2%Yb3+,0.5%Er3+ nanophosphor. The results pointed out that Yb/Er codoped Gd3Ga5O12 may be a potential candidate for optical temperature sensors and lighting.
Keywords : Nanophosphors, upconversion, color parameters, optical temperature sensing, luminescence thermometers

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