Up-conversion luminescence properties and thermal effects of LaVO4: Er3+ under 1550 nm excitation
Up-conversion luminescence properties and thermal effects of LaVO4: Er3+ under 1550 nm excitation
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LaVO4:Er3在1550 nm激发下的上转换发光特性和热效应
DOI：
10.1016/j.materresbull.2016.10.020
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发表时间：
2017
影响因子：
5.4
通讯作者：
Luo XX
中科院分区：
文献类型：
--
作者：
Yin Xiumei;Wang Hong;Jiang Tao;Xing Mingming;Fu Yao;Tian Ying;Luo Xixian;Luo XX
在1550 nm激发下，用Er 3+离子取代传统的敏化剂Yb 3+离子，在LaVO 4基质中实现了高效的上转换发光。与Y2 O2 S：Er 3+、Y2 O3：Er 3+、YOCl：Er 3+等上转换发光材料的红光发射不同，LaVO 4：Er 3+样品在1550 nm激发下呈现异常的绿色发射。激发态吸收是主要的上转换发光机制在低浓度的Er 3+，而能量转移上转换占主导地位，在高浓度的Er 3+。采用红外热成像技术研究了LaVO 4：Er 3+样品在1550 nm辐照下的热效应。样品在1550 nm（207 mW）的辐照下，60 s内的温升ΔT = 66.46 °C。因此，基于Er 3+离子2 H11/2/4S 3/2热耦合能级上转换发光的温度传感器在低温下由于热效应和入射光斑区域温度的不均匀性会产生较大的测量误差。
Efficiently up-conversion luminescence can be achieved by replacing the traditional sensitizer Yb3+ions with Er3+ions in LaVO4host under 1550 nm excitation. In contrast to other up-conversion luminescence materials, such as Y2O2S:Er3+, Y2O3:Er3+, YOCl:Er3+, which exhibit red emission, LaVO4:Er3+samples present an abnormal green emission under 1550 nm excitation. Excited state absorption is the dominating up-conversion luminescence mechanism at low doping concentrations of Er3+, whereas energy transfer up-conversion predominates at high concentrations of Er3+. Infrared thermal imaging is adopted to investigate the thermal effects of LaVO4:Er3+sample under 1550 nm irradiation. It shows a rapid heating process within 1 ∼ 5 s and LaVO4:0.21Er3+sample yields a temperature rising of ΔT = 66.46 °C under 1550 nm irradiation (207 mW) within 60 s. Therefore, the temperature sensor based on up-conversion luminescence of Er3+ions2H11/2/4S3/2thermally coupled levels produced significant measurement errors at low temperatures because of the thermal effects and non-uniform temperature of the incident light spot area.