Temperature Related Fluorescence Characteristics of YVO4∶1％Er3+Based on Variable Excitation
The fluorescence temperature sensing characteristics of YVO4∶1％Er3+excited under different wave-lengths have been investigated.The variable-temperature excitation and emission spectra of YVO4∶1％Er3+were measured excited at 312 and 345 nm.The results indicate that,in the temperature range of 303-573 K,an in-crease in temperature leads to an enhancement of the Er3+ion's 2H11/2 to 4I15/2 emission and a weakening of the 2S3/2 to 4I15/2 emission under 312 nm excitation.Conversely,under 345 nm excitation,both the 2H11/2 to 4I15/2 and the 2S3/2 to 4I15/2 emissions are enhanced.It is postulated that the observed changes in emission under 312 nm ex-citation with temperature are due to the thermal population effect of the rare-earth ions and the reduced absorp-tion by the matrix;while under 345 nm excitation,the simultaneous enhancement of both emissions is attribut-ed to the thermal population effects of the matrix and the ground state of the rare-earth ions.By fitting the ener-gy level difference between the 2H11/2 and 2S3/2 levels,the values of ΔE312=650.94 cm-1 and ΔE345=674.36 cm-1 are obtained.These results also demonstrate that different excitation wavelengths can lead to opposite trends in fluo-rescence intensity changes,yet do not affect the Boltzmann distribution of particle numbers between the thermal-ly coupled energy levels.
thermal coupling levelfluorescence temperature characteristicsYVO4
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