Study On Temperature Measurement Properties Of Fluorescence Intensity Ratio And Near Infrared Fluorescence Intensity Of Er³⁺/Yb³⁺, Tm³⁺/Yb³⁺Activated ZrO₂Nanocrystals

Temperature measurement is vital to many fields such as people’s livelihood andproduction, experiments, engineering control and so on. Recently, there are various kinds oftemperature measuring instruments commonly used. On the spot, different temperaturesensors based on different temperature measuring principles are selected according to specificdemands such as measuring range, accuracy and so on. One of optical temperature measuringmethods, based on fluorescence intensity ratio principle, receives intensive attention due to itsproperties of superior exciting power of noise-immunity and anti-instability of optical signalthat transmits in channels. Temperature measuring method that based on fluorescenceintensity has shortcomings of worse linearity and easily interrupted by surrounding, however,we found that the Tm doped marital has almost ideal linear property based on fluorescenceintensity temperature measurement.Combining with photon process and rare earth ion energy level matching analysis, weanalyzed luminescence upconversion mechanism excited by972nm laser diode （LD） ofseveral groups of Er³⁺/Yb³⁺, Tm³⁺/Yb³⁺codoped ZrO₂nanocrystal samples prepared bycombustion. The green light waveband spectrum versus temperature of ZrO₂:Er³⁺/Yb³⁺nanocrystal samples are measured. Temperature-dependent discipline of different greenfluorescence peaks is illustrated. Concrete expression of different fluorescence peak intensityratios verses temperature is derived through statistical treatment of data, and concreterelational expression of temperature measuring sensitivity is given. We find that the besttemperature measuring performance can be obtained by using the peak intensity ratio of525nm to561nm green light. This intensity ratio is most sensitive to temperature, and then itcorresponds to the highest sensitivity. The maximum sensitivity index is higher than thoseabout any Er³⁺ activated host material ever reported. Samples’ temperature measuringsensitivity versus exciting power is also measured. It is discovered that the regularity of datais better under higher exciting power conditions. The maximum sensitivity gets higher whenexciting power becomes higher, while the sensitivity gets lower under higher temperatureconditions.Temperature measurement that based on fluorescence intensity ratio by using Tm³⁺ activated material is firstly proposed by us. The blue light waveband spectrum versustemperature of ZrO₂:Tm³⁺/Yb³⁺nanocrystal samples are measured. Concrete relationalexpression of different fluorescence peak intensity ratios versus temperature is derived viastatistical treatment of data, and concrete relational expression of temperature measuringsensitivity is also derived. We find the peak intensity ratio of474nm to500nm blue light is thebiggest and it corresponds to the highest temperature measuring sensitive. The maximumsensitivity index is much higher than that of any Er³⁺activated host material ever reported.Samples’ temperature measuring sensitivity versus exciting power is also studied, and it isdiscovered that the sensitivity gets higher when exciting power becomes higher.It is discovered that Tm³⁺/Yb³⁺codoped ZrO₂nanocrystal sample has wonderful nearinfrared fluorescence intensity temperature measuring properties. For high exacting powerintensity conditions, fluorescence intensity shows a magnificent linear fading characteristicwhen temperature gets higher. Fitting expression of fluorescence intensity versus temperatureunder certain exacting power intensity conditions is given. Its temperature measuringsensitivity is a constant due to a linear fading regularity.