Controlled Synthesis And Research On Double Ion Doped Luminescent Thermometer

Non-contact optical thermometry based on fluorescence intensity ratio?FIR?has been widely researched over the past few decades,and exhibits potential application in strong electromagnetic and corrosive environment.However,most of the reported systems exhibit three important shortcomings including the high temperature sensitivity only at a narrow temperature range,the existence of a few interferential signals in addition to the required spectral bands for FIR and the absence of internal standard for reference signal,which limit their practical application.Different constituents of GdF₃ and Na₃ZrF₇ nanocrystals were synthesized by simple hydrothermal method and solvothermal method respectively.Their phase,morphology,luminescence and thermal behavior were researched systematically.The main findings are as follows:?1?A novel Ce/Mn/Eu tri-doped GdF₃ nano-thermometry based on different thermal behavior between Eu³⁺and Mn²⁺ions is constructed.The calculated relative sensitivity in the whole measured temperature range are beyond 1.08%K^-1 and the maximum S_a is about 0.078 K^-1 for the 50Ce/8Mn/2Eu:GdF₃ NCs,which are superior to several other inorganic nano-thermometry at the same temperature.In addition,these colorimetric temperature sensing materials exhibit potential application in anti-counterfeiting field as well.?2?Only two emission bands of Er³⁺:⁴F_9/2?⁴I_15/2?⁶73 nm?and Tm³⁺:³H₄?³H₆?⁸00 nm?are achieved in Yb/Er/Tm tri-doped Na₃ZrF₇ nano-system.Moreover,the up-conversion?UC?emission intensity of Er³⁺keeps unchanged with the rising of temperature,which is applied as reference signal;while that of Tm³⁺enhances evidently,which is applied as temperature signal.The calculated maximum absolute temperature sensitivity?S_a?and relative temperature sensitivity?S_r?are 0.17 K^-1 at 393K and 1.76%K^-1 at 313 K,respectively.