1. Double-site emission of Eu2+ ions in Sr4Al14O25: Eu2+ phosphors for self-calibrated optical thermometry
- Author
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Ming Wu, Fengping Ruan, Lei Lei, Shiqing Xu, Ruoshan Lei, Degang Deng, and Bowen Chen
- Subjects
Materials science ,Photoluminescence ,Aluminate ,Organic Chemistry ,Analytical chemistry ,Phosphor ,02 engineering and technology ,Atmospheric temperature range ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Temperature measurement ,Atomic and Molecular Physics, and Optics ,Spectral line ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Ion ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,Luminescence ,Spectroscopy - Abstract
Eu2+ activated aluminate Sr4Al14O25 with dual-emitting centers were prepared via a solid-state method in a reductive atmosphere. Photoluminescence emission (PL) and excitation (PLE) spectra of phosphor along with the lifetimes were characterized, which confirm the 5d→4f energy transition behavior of Eu2+ between 400 nm and 490 nm emission. The fluorescence intensity ratio of I490 and I400 in the phosphors exhibits remarkable temperature dependence, owing to the diverse thermal quenching behaviors of Eu2+ emission centers. Using the phosphors to perform thermometry, excellent temperature sensitivity is achieved in the temperature range of 293–423 K. The maximum absolute and relative sensitivity are 0.004 K-1 and 0.624% at 373 K, respectively. In particular, the dual-site luminescence of Eu2+ ions can be used as the reference signal and the temperature signal of the fluorescence temperature sensor respectively. It will be helpful to develop a new self-reference optical temperature measurement technology with excellent performance.
- Published
- 2019