Influence Of Temperature On The Charge Transfer Band And The High-precision Fluorescence Temperature Measurement Strategy

The fluorescence temperature measurement method realizes non-contact real-time detection,which can support the temperature measurement of more complex environments,fast-moving targets or objects that cannot be directly contacted.Among them,the fluorescence intensity is less than the temperature measurement method due to external interference,strong anti-excitation power,The advantages of good spatial resolution,rapid response,and the ability to measure small objects have always attracted people's attention,and have very important applications in many fields,such as fluorescence microscopy,nanometer temperature measurement,photodynamic therapy,optogenetics,cancer tissue Hyperthermia,security inks,photoelectric converters,and three-dimensional volume displays,etc.However,the relative sensitivity and temperature measurement accuracy of optical thermometers that have been discovered at this stage are low.This paper is dedicated to designing a measurement that has both high relative sensitivity and high temperature by using the charge transfer bands that appear in some oxo acid salts.Temperature measurement strategy with temperature accuracy.Three groups of Ca Mo O₄:RE³⁺samples with doping concentration were studied,the doping concentration was 1%,5%,and 10%;the doped rare earths contained six kinds:Sm,Eu,Tb,Dy,Ho,Er.And measured the variable concentration fluorescence spectra and variable concentration excitation spectra at room temperature.Six different rare earth elements are doped into the same molybdate.When all the measurement optical paths and measurement conditions are the same,the signal-to-noise ratio of each sample is slightly different,and the relative intensities of the charge transfer band and the rare earth also vary.The concentration changes.In the second chapter,the optimal doping concentration of different rare-earth doped samples is studied based on the room temperature excitation spectrum,and the doping concentration of the subsequent research samples is determined.In addition,by observing the variable concentration excitation spectrum of the sample,doping a rare earth of different concentration into the same molybdate within the allowable range of error,the CTB peak position in the measured excitation spectrum remains unchanged,which explains the charge migration Belt formation mechanism.The effect of temperature on the CTB in the Ca Mo O₄and YVO₄matrix was studied.Six rare earths were doped into the matrix to observe the variable temperature excitation spectra of the sample in the range of 303K to 783K.The temperature dependence of CTB in the two matrixes is exactly the opposite.The characteristics of increase and decrease,taking into account the definition of relative sensitivity based on the fluorescence intensity ratio of mixed ions to the temperature measurement method,such a group of samples with opposite characteristics to temperature are suitable as mixed materials for temperature measurement.The temperature-variable fluorescence spectra of the prepared YVO₄:Eu³⁺and Ca Mo O₄:Er³⁺mixed materials under 380 nm excitation were studied.The optical fiber spectrometer and Labview computer software were used to measure the spectra,and the relative sensitivity and temperature measurement accuracy of the mixed fluorescent materials were studied.The results show that the actual relative sensitivity of the prepared fluorescent material is basically the same as the relative sensitivity calculated by the excitation spectrum theory.The research in this paper provides a new idea for the selection of temperature measurement materials based on the fluorescence intensity ratio temperature measurement method of mixed materials.It has high precision and high relative sensitivity in a wide temperature range.