Effect of Doping Concentration and Excitation Power on Upconversion and Temperature Sensitivity of Gd3Ga5O12:Yb3+/Er3+ Phosphors
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 (XRD), transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), and photoluminescence measurements (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.
Publisher
Marmara University
Reference34 articles.
1. Referans1 Daldosso, M., Falcomer, D., Speghini, A., Bettinelli, M., Enzo, S., Lasio, B., & Polizzi, S. (2008). Synthesis, structural investigation and luminescence spectroscopy of nanocrystalline Gd3Ga5O12 doped with lanthanide ions. J. Alloys Compd., 451(1–2), 553–556. 2. Referans2 Venkatramu, V., León-Luis, S. F., Rodríguez-Mendoza, U. R., Monteseguro, V., Manjón, F. J., Lozano-Gorrín, A. D., Valiente, R., Navarro-Urrios, D., Jayasankar, C. K., Muñoz, A., & Lavín, V. (2012). Synthesis, structure and luminescence of Er 3+-doped Y3Ga5O12 nano-garnets. J. Mater. Chem., 22(27), 13788–13799. 3. Referans3 Singh, S. K., Lee, D. G., Yi, S. S., Jang, K., Shin, D. S., & Jeong, J. H. (2013). Probing dual mode emission of Eu3+ in garnet phosphor. J. Appl. Phys., 113(17). 4. Referans4 Wang, X., Li, X., Xu, S., Cheng, L., Sun, J., Zhang, J., Li, L., & Chen, B. (2019). A comparative study of spectral and temperature sensing properties of Er3+ mono-doped LnNbO4 (Ln = Lu, Y, Gd) phosphors under 980 and 1500 nm excitations. Mater. Res. Bull., 111, 177–182. 5. Referans5 Ranjan, S. K., Mondal, M., & Rai, V. K. (2018). Er3+-Yb3+/Er3+-Yb3+-Li+/Er3+-Yb3+-Zn2+:Gd2O3 nanophosphors for efficient frequency upconverter and temperature sensing applications. Mater. Res. Bull., 106, 66–73.
|
|