Applicability of Dy-doped yttrium aluminum garnet (YAG:Dy) in phosphor thermometry at different oxygen concentrations
Applicability of Dy-doped yttrium aluminum garnet (YAG:Dy) in phosphor thermometry at different oxygen concentrations
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DOI：
10.1016/j.jlumin.2018.12.016
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发表时间：
2019-04-01
影响因子：
3.6
通讯作者：
Yokomori, Takeshi
中科院分区：
文献类型：
--
作者：
Ishiwada, Naohiro;Tsuchiya, Kazuki;Yokomori, Takeshi
荧光粉测温法是一种基于荧光粉随温度变化的磷光来测量温度的方法，用来解释高温气流等热传递现象。虽然各种稀土掺杂的热成像荧光粉已经被使用，但氧浓度对其磷光的影响还没有得到充分的研究。本文探讨了掺Dy的稀土掺杂荧光粉YAl石榴石在不同氧浓度下的温度灵敏度在1000K以上的荧光粉在荧光粉中的适用性。三倍频的Nd：YAG激光激发了样品。用光电倍增管测量磷光寿命。用光谱仪检测两条发射线之间的光强比。燃烧室中充满了浓度可控的氮氧混合物。在较宽的温度范围内，磷光强度比随氧浓度的变化而变化，尤其是在1000K以上。在整个温度范围内都能检测到发光强度比的变化，并在1000K以下保持不变。另外，随着氧浓度的增加，发光寿命减小，尤其是在1000K以上，证实了氧猝灭效应。因此，证实了在1000K以上，对氧浓度变化比较敏感的激光晶体，其光强比和寿命对其影响较大。
Phosphor thermometry is a method used to measure temperature based on the temperature-dependent phosphorescence of phosphors and elucidate heat transfer phenomena, such as high-temperature gas flow. Although various rare earth-doped thermographic phosphors are in use, the effect of oxygen concentration on their phosphorescence has not been sufficiently explored. We explore herein the applicability of Dy-doped yttrium aluminum garnet (YAG:Dy), a well-known rare earth-doped phosphor with temperature sensitivity above 1000 K, in phosphor thermometry at different oxygen concentrations. A third-harmonic Nd: YAG laser excited the sample. Phosphorescence was measured using a photomultiplier tube for lifetime detection. A spectrometer was used to detect the intensity ratio between two emission lines. The chamber was filled with a nitrogen-oxygen mixture with a controlled concentration. The phosphorescence intensity ratio depended on temperature over a wide temperature range and varied with the oxygen concentration, especially above 1000 K. The YAG:Dy lifetimes could be detected over the entire temperature range and remained constant up to 1000 K. In addition, the lifetimes decreased with the increasing oxygen concentration, especially above 1000 K, confirming the oxygen quenching effect. Consequently, YAG:Dy is confirmed to be sensitive to oxygen concentration for determining the intensity ratio and lifetime, especially above 1000 K.