Observation of a red Ce3+ center in SrLu2O4:Ce3+ phosphor and its potential application in temperature sensing. Issue 16 (3rd April 2019)

• Record Type: Journal Article
• Authors: Zhang, Sheng; Hao, Zhendong; Zhang, Liangliang; Pan, Guo-Hui; Wu, Huajun; Wu, Hao; Luo, Yongshi; Liu, Xingyuan; Zhang, Hong; Zhang, Jiahua
• Is Part Of: Dalton transactions. Volume 48:Issue 16(2019)
• Page Start: 5263
• Page End: 5270
• Publication Date: 2019-04-03
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9dt00789j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : In Ce 3+ activated SrLn2 O4 type phosphors (Ln = Y, Lu, Sc, etc. ) only one Ce 3+ center was previously reported to show a blue emission band. Abstract : In Ce 3+ activated SrLn2 O4 type phosphors (Ln = Y, Lu, Sc, etc. ) only one Ce 3+ center was previously reported to show a blue emission band. In this paper, we report the observation of a second Ce 3+ center in SrLu2 O4 :Ce 3+ . The new center shows a red emission band peaking at 600 nm with an excitation band at 485 nm. We attributed the new center (Ce(ii )) to the substitution of the Lu 3+ site and the original blue center (Ce(i )) to the substitution of the Sr 2+ site. Spectroscopy studies indicate that Ce(i ) centers are preferentially formed at a low doping concentration and the number ratio of Ce(i )/Ce(ii ) decreases with increasing Ce 3+ concentration until beyond 0.002. The fluorescence lifetimes of the two centers were measured for various doping concentrations. Energy transfer from Ce(i ) to Ce(ii ) was observed. It was found that the emission intensity of Ce(ii ) centers reduces much faster than that of Ce(i ) with increasing temperature from 83 K up to 350 K, implying their potential application in temperature sensing based on their temperature dependent intensity ratios. A relative sensing sensitivity as high as 2.28% K −1 at 283 K was achieved.