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Luminescence properties of Eu3+ doped YBO3 for temperature sensing
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作者 赵路 +2 位作者 韦先涛 陈永虎 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2017年第4期356-360,共5页
YBO_3:2 at.% Eu~(3+) was prepared by the solid state reaction and its temperature dependent luminescence was investigated for possible applications in temperature sensing. Phase composition of this material was confir... YBO_3:2 at.% Eu~(3+) was prepared by the solid state reaction and its temperature dependent luminescence was investigated for possible applications in temperature sensing. Phase composition of this material was confirmed by X-ray powder diffraction analysis and excitation and emission spectra were also provided. Under excitation of 355 nm, the fluorescence originating from ~5D_0 and ~5D_1 states varied as the temperature rose in a region from 333 to 773 K. The fluorescence intensity ratio(FIR) of ~5D_0 and ~5D_1 was investigated which increased significantly with the rise of temperature. The maximal relative sensitivity in the whole temperature range was 1.8% K~(–1)(at 333 K). The results recommended YBO_3:Eu~(3+) as a new material of the FIR method for non-contact optical thermometry. 展开更多
关键词 温度传感 发光特性 X射线粉末衍射分析 掺杂 激发光谱 荧光强度 温度依赖性 固相反应
Investigation of the temperature characteristic in SrB4O7:Sm2+ phosphor-in-glass by analyzing the lifetime of 684 nm
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作者 曾鹏 +1 位作者 陈永虎 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2017年第8期783-786,共4页
The SrB_4O_7:Sm~(2+) phosphor was synthesized by high temperature solid state reaction method. The phosphor-in-glass was prepared by mixing and firing the phosphor and TeO_2-ZnO glass precursor. The XRD results showed... The SrB_4O_7:Sm~(2+) phosphor was synthesized by high temperature solid state reaction method. The phosphor-in-glass was prepared by mixing and firing the phosphor and TeO_2-ZnO glass precursor. The XRD results showed that the phosphor-in-glass was in amorphous phase because of the tiny mass fraction of phosphor in glass. The emission spectrum under the 355 nm excitation was measured, and it exhibited the same characteristic emission peaks as the phosphor sample. The temperature characteristic of the SrB_4O_7:Sm~(2+) phosphor-in-glass was discussed by analyzing the lifetime of 684 nm emission at various temperatures. The relative temperature sensitivity of 5%/K around 573 K was obtained for the temperature dependent lifetime, suggesting that the material in this study is a promising candidate for temperature sensor application. 展开更多
关键词 温度特性 荧光粉 SM2 玻璃 寿命 高温固相反应法 发射光谱 温度敏感性
An abnormal fluorescence intensity ratio between two green emissions of Er3+ caused by heating effect of 980 nm excitation
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作者 周少帅 李心悦 +3 位作者 段昌奎 陈永虎 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2015年第10期1031-1035,共5页
An abnormal fluorescence intensity ratio(FIR) between two green emissions of Er3+ at room temperature, which is larger than a normal value, emerged in many reported articles. However, up to now detailed work has seldo... An abnormal fluorescence intensity ratio(FIR) between two green emissions of Er3+ at room temperature, which is larger than a normal value, emerged in many reported articles. However, up to now detailed work has seldom been done to clarify this abnormal phenomenon. In this paper, green upconversion luminescence of the β-Na Lu F4:20%Yb3+,2%Er3+ powder sample was investigated under 980 nm excitation at different circumstances, different pump power densities and different temperatures as well as different air pressures. The corresponding local temperature calculated using FIR technique increased gradually with the enhancement of the pump power density. It was demonstrated that high pump power density of 980 nm laser led to the increase of local temperature of the luminescent material, which further gave the abnormal FIR. 展开更多
关键词 荧光强度 异常 排放 激发 强度比 热效应 抽运功率密度 温度计算
Optical properties of Er3+ doped KYbxF3x+1 (x=2, 3) upconverting nanoparticles
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作者 陈永虎 +2 位作者 周少帅 段昌奎 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2015年第9期911-914,共4页
Well dispersed orthorhombic structure KYb2F7:2 mol.%Er3+ and KYb3F10:2 mol.%Er3+ nanoparticles were synthesized through solvothermal method. Measurements of X-ray diffraction(XRD), transmission electron microscopy(TEM... Well dispersed orthorhombic structure KYb2F7:2 mol.%Er3+ and KYb3F10:2 mol.%Er3+ nanoparticles were synthesized through solvothermal method. Measurements of X-ray diffraction(XRD), transmission electron microscopy(TEM) and upconversion spectra showed excellent morphology and optical properties of the as-prepared samples. The intensity ratio of the red emission(650 nm) to the green emission(545 nm) in these two materials was much stronger than that in other Er3+ doped materials. The transition mechanism of the processes was investigated and discussed. Due to their strong red emission, the samples are promising for applications in display, color tuning, and biolabeling. 展开更多
关键词 上转换光谱 ER3+ 光学性能 纳米粒子 掺杂材料 透射电子显微镜 溶剂热法合成 红光发射
酒库管理的一点体会 预览
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作者 周恒刚 《酿酒》 CAS 1997年第4期 17-18,共2页
酒库管理的一点体会周恒刚(北京右安门大街轻工宿舍15门132单元)曹中民(哈尔滨三九龙滨酒厂)在白酒的生产过程中,不能把酒库管理理解为只是对半成品酒简单的保管。它是名优酒生产工艺上的重要组成部分,它担负着酒的老熟和为... 酒库管理的一点体会周恒刚(北京右安门大街轻工宿舍15门132单元)曹中民(哈尔滨三九龙滨酒厂)在白酒的生产过程中,不能把酒库管理理解为只是对半成品酒简单的保管。它是名优酒生产工艺上的重要组成部分,它担负着酒的老熟和为勾兑提供不同典型特征的基酒。故此,... 展开更多
关键词 白酒 酒库管理 贮存
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物理实验中观察能力培养之浅谈 预览
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作者 《课程教育研究:学法教法研究》 2017年第9期43-43,共1页
物理学又是一门以观察、实验为基础的学科,因此培养学生观察能力。对激发学生学习兴趣,提高教学效果,都具有特别重要的意义。
关键词 物理实验 观察能力 培养
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浅议物理教学中的语言表达技巧 预览
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作者 《魅力中国》 2010年第16期 219,共1页
物理学科是培养学生实际动手操作能力和逻辑思维能力的有效载体,对于提高学生综合素质和促进学生全面发展具有重要的推进作用。由于物理学科的抽象性、特殊性往往使学生感到学习困难,但在物理教学过程中运用一些有效的教学技巧可以帮... 物理学科是培养学生实际动手操作能力和逻辑思维能力的有效载体,对于提高学生综合素质和促进学生全面发展具有重要的推进作用。由于物理学科的抽象性、特殊性往往使学生感到学习困难,但在物理教学过程中运用一些有效的教学技巧可以帮助学生解决所面临的学习困难,培养学生浓厚的学习兴趣。本文结合教学过程中的经验感受探讨一些在物理教学中的语言表达技巧。 展开更多
关键词 教学技巧 语言教学 物理课堂 语意表达
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