Pumping-route-dependent concentration quenching and temperature effect of green up- and down-conversion luminescence in Er3+/Yb3+ co-doped Gd2(WO4)3 phosphors

• Published in: Materials research bulletin 2013-06, Vol.48 (6), p.2159-2165
• Main Authors: Li, Jingjing, Sun, Jiashi, Liu, Jutao, Li, Xiangping, Zhang, Jinsu, Tian, Yue, Fu, Shaobo, Cheng, Lihong, Zhong, Haiyang, Xia, Haiping, Chen, Baojiu
• Format: Article
• Language: English
• Subjects: A. Optical materials; B. Chemical synthesis; C. X-ray diffraction; D. Optical properties
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2013.02.009

A comparative study on the concentration quenching behaviors of green down- and up-conversion emissions was carried out for the first time, and the different concentration quenching mechanisms were analyzed. Secondly, the thermal effect induced by 980nm LD irradiation was investigated, it was observed that the equilibrium temperature of Gd2(WO4)3:Er3+/Yb3+ sample was decided by both the excitation power and Er3+ doping concentration. [Display omitted] ► Gd2(WO4)3:Er/Yb phosphors were prepared via a co-precipitation reaction. ► Morphology and structure of the phosphors were characterized by XRD and SEM. ► Concentration quenching mechanisms for down and up emissions were studied. ► Thermal effect induced by laser irradiation was studied via temperature sensing tech. Gd2(WO4)3 phosphors with various Er3+ concentrations and fixed Yb3+ concentration were synthesized via a co-precipitation method, and their crystal structure and morphology were characterized by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The concentration quenching behaviors of green up- and down-conversion emissions of Er3+ were analyzed, and it was confirmed that the difference between quenching concentration for up- and down-conversion emissions resulted from the different population routes. The temperature sensing properties of the Gd2(WO4)3:Er3+/Yb3+ phosphors were studied, and it was found that the Er3+ doping concentration slightly affected the sensitivity, and Gd2(WO4)3:Er3+/Yb3+ phosphors could be used in a broad temperature region for detecting temperature. Finally, the thermal effect induced by 980nm LD irradiation was investigated, it was observed that the equilibrium temperature of Gd2(WO4)3:Er3+/Yb3+ sample was decided by both the excitation power and Er3+ doping concentration.