Wang Hong, Yin Xiumei, Xing Mingming, Fu Yao, Tian Ying, Feng Xin, Jiang Tao, Luo Xixian
Physics Department, Dalian Maritime University, Dalian, Liaoning 116026, P. R. China.
Phys Chem Chem Phys. 2017 Mar 28;19(12):8465-8470. doi: 10.1039/c7cp00079k. Epub 2017 Mar 13.
The thermal effects of NaYF:Er microcrystals under 1550 nm laser diode irradiation were investigated using an infrared thermal imaging method. The results revealed that the temperature of the LD irradiation beam area was non-uniform. The NaYF:Er sample exhibits a rapid temperature increase within 5-10 s, and the heating process reaches its steady state after 60 s of irradiation when exposed to 1550 nm LD. The response time, temperature increase, and emission intensity of the samples depend on the excitation power density and concentration of doped Er ions. Low excitation power density is required to avoid the influence of thermal effects on the up-conversion emission spectra measurement. Rapid scanning in up-conversion emission spectra measurement is not effective in preventing the heating effect under high excitation power pumping. In addition, a relative deviation of temperature, existing in fluorescence intensity ratio technique, decreased with the increasing irradiation time.
