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

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 fabricated material studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), photoluminescence measurements (PL). Upconversion luminescence characteristics investigated in range 450-850 nm a 975 laser source. Emission, optical, theoretical thermal behaviors analyzed with respect to Er3+ ion content increasing excitation power. Temperature sensitivity calculations based on fluorescence intensity ratio performed employing thermally-coupled levels Er3+. maximum was calculated optimal value 0.83x10-2 K-1 for Gd3Ga5O12:2%Yb3+,0.5%Er3+ nanophosphor. results pointed out that may be potential candidate optical temperature sensors lighting.