Preparation and Research on the Optical Temperature Sensing Properties of Ho3+ doped NaY(MoO4)2 Phosphors. Issue 38 (7th October 2021)

• Record Type: Journal Article
• Authors: Tian, Ye; Meng, Qingyu; Zhang, Liying; Sun, Wenjun; Wang, Changwen
• Is Part Of: ChemistrySelect. Volume 6:Issue 38(2021)
• Page Start: 10182
• Page End: 10189
• Publication Date: 2021-10-07
• Subjects: FIR -- Ho3+ -- Optical temperature sensing -- Relative sensitivity; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202102584
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: In this work, NaY(MoO4 )2 : 5 % Ho 3+ were synthesized successfully with sodium citrate as chelating agent by hydrothermal method. As X‐ray diffraction graphs showed, the samples were body‐centered quadrilateral structure. The Field‐emission Scanning Electron Microscope pictures demonstrated the morphology of the experimental samples changed with different amounts of sodium citrate. The temperature‐dependent emission spectra (293‐563 K) revealed different thermal quenching trends of the emission peaks from different energy levels ( 5 F4 / 5 S2 → 5 I7, 5 F4 / 5 S2 → 5 I8 and 5 F5 → 5 I8 ). The two groups of fluorescence intensity ratios (FIR) could be applied to temperature measurement ( 5 F4 / 5 S2 → 5 I8 to 5 F5 → 5 I8 and 5 F4 / 5 S2 → 5 I7 to 5 F5 → 5 I8 ). As sodium citrate content increased, the maximum values of relative sensitivity of the samples increased, among which the greatest one was 0.316 % K −1 (Cit 3− /Re 3+ =2). In addition, the FIR had good repeatability in heating, cooling and heating again process that indicated the temperature sensing properties of the sample were steady. Since it was possible to characterize temperature with two sets of FIR, the samples could play a self‐calibrating character. Summing up the above, the NaY(MoO4 )2 : 5 % Ho 3+ phosphors were promising optical temperature sensing materials. Abstract : The Ho 3+ doped NaY(MoO4 )2 phosphors were obtained by the hydrothermal with sodium citrate as chelating agent. The morphology of the samples changed with amounts of sodium citrate increased. The relative sensitivities of phosphors were significantly improved with the Na3 Cit increased, and the maximum value was 0.316 % K −1 (Cit 3−/ Re 3+ =2). Moreover, the phosphors could use two sets of FIR (I541.5 to I660.5, I755.5 to I660.5 ) to monitor the temperature which made the results more accurate and achieved self‐calibration.