Sol-gel synthesis and optical temperature sensing properties of PbTiO3:Yb3+/Er3+ phosphors. (March 2022)

• Record Type: Journal Article
• Authors: Liao, Jinsheng; Han, Zhuo; Huang, Junxiang; Fu, Biao; Sun, Yijian; Yuan, Huali; Wen, Herui
• Is Part Of: Journal of physics and chemistry of solids. Volume 162(2022)
• Publication Date: 2022-03
• Subjects: Upconversion -- Phosphor -- Luminescence -- NIR -- Optical temperature sensing; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2021.110515
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: This paper reports a new type of PbTiO3 :Yb 3+ /Er 3+ (PTO:Yb 3+ /Er 3+ ) phosphor synthesized by sol-gel method. Under 980 nm excitation, PTO:Yb 3+ /Er 3+ phosphors exhibited green emission bands centered at 524/549 nm ( 2 H11/2 / 4 S3/2 → 4 I15/2 ) and red emissions 661 nm ( 4 F9/2 → 4 I15/2 ). Concentration-dependent upconversion (UC) luminescence spectra showed that the optimal luminescence was observed at 6at%Yb 3+ /2at%Er 3+ -codoping concentration. A possible UC mechanism for PTO:Yb 3+ /Er 3+ phosphor is discussed by the pump power-dependent UC luminescence spectra. The temperature-dependence (298–548 K) of the fluorescence intensity ratios (FIR) for the two green UC emission bands peaked at 524 and 549 nm was studied under a 980 nm laser excitation and the maximum relative sensitivity was approximately 12.25 × 10 −3 K −1 at 298 K. The thermal quenching activation energy of near-infrared (NIR) luminescence was studied. It can be found that the phosphor has a small thermal quenching possibility and excellent thermal stability. The value of repeatability (R) more than 98% has obtained via four cycles of cooling and heating, which prove that the phosphor has a good cycling stability. These results indicate that PTO:Yb 3+ /Er 3+ phosphor is a promising candidate for optical temperature sensors with high sensitivity and good repeatability. Highlights: 1 PbTiO3 :Yb 3+ /Er 3+ phosphors were successfully synthesized by the sol-gel method. 2 The thermal repeatability is up to 98% for the given temperature range。 3 The high relative sensitivity of PTO:Yb 3+ /Er 3+ was 12.25 × 10 −3 K −1 via FIR technology. 4. The NIR luminescence at 1546 nm with excellent thermal stability is obtained.