摘要：This work presents a new method to effectively improve the optical temperature behavior of Er(3+) doped Y2O3 microtubes by co-doping of Tm(3+) or Ho(3+) ion and controlling excitation power. The influence of Tm(3+) or Ho(3+) ion on optical temperature behavior of Y2O3:Er(3+) microtubes is investigated by analyzing the temperature and excitation power dependent emission spectra, thermal quenching ratios, fluorescence intensity ratios, and sensitivity. It is found that the thermal quenching of Y2O3:Er(3+) microtubes is inhibited by co-doping with Tm(3+) or Ho(3+) ion, moreover the maximum sensitivity value based on the thermal coupled (4)S3/2/(2)H11/2 levels is enhanced greatly and shifts to the high temperature range, while the maximum sensitivity based on (4)F9/2(1)/(4)F9/2(2) levels shifts to the low temperature range and greatly increases. The sensitivity values are dependent on the excitation power, and reach two maximum values of 0.0529/K at 24 K and 0.0057/K at 457 K for the Y2O3:1%Er(3+), 0.5%Ho(3+) at 121 mW/mm(2) excitation power, which makes optical temperature measurement in wide temperature range possible. The mechanism of changing the sensitivity upon different excitation densities is discussed.
