Observation of a red Ce3 center in SrLu2O4:Ce3 phosphor and its potential application in temperature sensing
Observation of a red Ce3 center in SrLu2O4:Ce3 phosphor and its potential application in temperature sensing
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SrLu2O4:Ce3 荧光粉中红色 Ce3 中心的观察及其在温度传感中的潜在应用
DOI：
10.1039/c9dt00789j
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发表时间：
2019
影响因子：
4
通讯作者：
Zhang Jiahua
中科院分区：
文献类型：
--
作者：
Zhang Sheng;Hao Zhendong;Zhang Liangliang;Pan Guo Hui;Wu Huajun;Wu Hao;Luo Yongshi;Liu Xingyuan;Zhang Hong;Zhang Jiahua
在Ce ~（3+）激活的SrLn_2 O_4型荧光粉（Ln = Y、Lu、Sc等）中，先前报道只有一个Ce 3+中心显示出蓝色发射带。本文报道了在SrLu_2O_4：Ce ~（3+）中观察到的第二个Ce ~（3+）中心。新中心显示峰值在600 nm处的红色发射带和485 nm处的激发带。我们将新中心（Ce（II））归因于Lu 3+位置的取代，而原始蓝中心（Ce（I））归因于Sr 2+位置的取代。光谱研究表明，Ce（I）中心在低掺杂浓度下优先形成，Ce（I）/Ce（II）的数量比随着Ce 3+浓度的增加而减小，直到超过0.002。两个中心的荧光寿命进行了测量，为各种掺杂浓度。观察到Ce（I）向Ce（II）的能量转移。结果表明，随着温度的升高，Ce（II）中心的发光强度比Ce（I）中心的发光强度降低得更快，这表明Ce（II）中心的发光强度比随温度的变化具有潜在的温度传感应用价值。在283 K时，相对传感灵敏度高达2.28%K −1。
In Ce3+ activated SrLn2O4 type phosphors (Ln = Y, Lu, Sc, etc.) only one Ce3+ center was previously reported to show a blue emission band. In this paper, we report the observation of a second Ce3+ center in SrLu2O4:Ce3+. 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 Lu3+ site and the original blue center (Ce(I)) to the substitution of the Sr2+ 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 Ce3+ 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.