Research Of Multi-emission Peak Temperature Measurement Technology Based On Stark Sub-level

Compared with the traditional contact temperature sensor,the optical temperature sensor based on the fluorescence intensity ratio technology has the advantages of the remote measurement,wide temperature measuring range and anti-electromagnetic interference,which bring this new sensor a lot of attention.The application range and application values of this type of sensor mainly depend on how to select the substrate materials and how to improve the precision and stability of temperature measurement methods,which is important in the various research fields.In order to solve the problem of poor temperature measurement stability and accuracy in the traditional"spectral integral ratio"temperature measurement method.This paper was mainly discussed the characteristics of the NaYF₄:Yb³⁺/Er³⁺and NaGd（WO₄）₂:Yb³⁺/Er³⁺which is applied in the temperature sensor,as well as proposed a whole new"peak value ratio of multi-emission peak"temperature measurement technology.In the end,we analyzed the temperature measurement performance of the technology.The specific research contents are as follows:1.The upconversion luminescence characteristics of NaYF₄:Yb³⁺/Er³⁺nanocrystal have been studied under a 980nm laser pumping.Then the temperature sensing characteristics of NaYF₄:Yb³⁺/Er³⁺nanocrystal have been studied within the temperature range of 298-383K.Based on the"Stark splitting phenomenon"observed by the Er³⁺in the nanocrystal,a"peak value ratio of multi-emission peak"temperature measurement technology has been proposed,and then the traditional"spectral integral ratio"technology has been compared with the"relative sensitivity","temperature measurement precision"and other performance parameters.In the end,the feasibility of the temperature measurement technology has been analyzed.2.Using the laser with the wavelength of 980nm as the excitation light source,the upconversion luminescence performance and temperature sensing characteristics of NaGd（WO₄）₂:Yb³⁺/Er³⁺nanocrystal have been studied by using the same experimental research method mentioned above.The experimental data have been processed and analyzed by using the"temperature measurement technology for the peak value ratio of multi-emission peak"and traditional"temperature measurement technology of spectral integral ratio"proposed by the work 1,respectively.By comparing and analyzing the advantages and disadvantages of the NaGd（WO₄）₂:Yb³⁺/Er³⁺and NaYF₄:Yb³⁺/Er³⁺luminescent materials in the luminescence performance,physicochemical properties and temperature measurement performance,the application value of the optical temperature sensor based on the NaGd（WO₄）₂:Yb³⁺/Er³⁺has been comprehensively analyzed.3.The characteristic test for the electrical properties of NaGd（WO₄）₂:Yb³⁺/Er³⁺samples is carried out by using the"four-probe method".Results shows that this kind of material is an insulator.It is also known that the nanocrystal material has excellent luminescence characteristics and strong spectral thermosensitive characteristics,so this material is comprehensively considered for the real-time monitoring and controlling of the operating temperature of the integrated circuit system.By using the"photocell combination"and"spectrometer"as the fluorescence acquisition device,respectively,the testing is conducted to get the corresponding experimental data,which are processed by using the three temperature measurement technology of the"photovoltage ratio","spectrum integral ratio"and"peak value ratio of multi-emission peak”.Finally,the superiority for the temperature measurement technology of"peak value ratio of multi-emission peak"has been analyzed.