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Phys Chem Chem Phys. 2017 Mar 28;19(12):8465-8470. doi: 10.1039/c7cp00079k. Epub 2017 Mar 13.

Investigation on the thermal effects of NaYF4:Er under 1550 nm irradiation.

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Physics Department, Dalian Maritime University, Dalian, Liaoning 116026, P. R. China.


The thermal effects of NaYF4: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 NaYF4: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 Er3+ 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.


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