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Upconversion luminescence and temperature sensing performance of Er^(3+) ions doped self-activated KYb(MoO_(4))_(2) phosphors
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作者 Ye Tong Wenpeng Liu Shoujun Ding 《Journal of Rare Earths》 SCIE EI CAS CSCD 2024年第8期1507-1513,I0004,共8页
In this work,a series of self-activated KYb(MoO_(4))_(2) phosphors with various x at% Er^(3+) doping concentrations(x=0.5,1,3,5,8,10,15) was synthesized by the solid-state reaction method.The phase structure of the as... In this work,a series of self-activated KYb(MoO_(4))_(2) phosphors with various x at% Er^(3+) doping concentrations(x=0.5,1,3,5,8,10,15) was synthesized by the solid-state reaction method.The phase structure of the as-prepared samples was analyzed by X-ray diffraction(XRD),XRD Rietveld refinement and Fourier transform infrared(FT-IR) spectroscopy.The as-prepared samples retain the orthorhombic structure with space group of Pbcn even Er^(3+) doping concentration up to 15 at%.High-purity upconversion(UC) green emission with green to red intensity ratio of 55 is observed from the as-prepared samples upon the excitation of 980 nm semiconductor laser and the optimum doping concentration of Er^(3+) ions in the self-activated KYb(MoO_(4))_(2) host is revealed as 3 at%.The strong green UC emission is confirmed as a two-photon process based on the power-dependent UC spectra.In addition,the fluorescence intensity ratios(FIRs) of the two thermally-coupled energy levels,namely ^(2)H_(11/2) and ^(4)S_(3/2).of Er^(3+) ions were investigated in the temperature region 300-570 K to evaluate the optical temperature sensor behavior of the sample.The maximum relative sensitivity(S_(R)) is determined to be 0.0069 K^(-1) at300 K and the absolute sensitivity(S_(A)) is determined to be 0.0126 K^(-1) at 300 K.The S_(A) of self-activated KYb(MoO_(4))2:Er^(3+)is almost twice that of traditional KY(MoO_(4))2:Er^(3+)/Yb^(3+)codoping phosphor.The results demonstrate that Er^(3+) ions doped self-activated KYb(MoO_(4))2 phosphor has promising application in visible display,trademark security and optical temperature sensors. 展开更多
关键词 Er^(3+)ions doped KYb(MoO_(4))_(2) Self-activated phosphors upconversion luminescence solid-state reaction method Optical temperature sensors Rare earths
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Solid-state green-light-emitting upconversion coherent random laser in macroporous LiNbO_3:Er
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作者 石凡 赵萌 +2 位作者 贾晨 赵宇峰 陈胜勇 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第1期62-65,共4页
A solid-state green-light-emitting upconversion coherent random laser was realized by pumping macroporous erbium-doped lithium niobate with a 980 nm laser. The lasing threshold was determined to be about 40 k W∕cm~2.... A solid-state green-light-emitting upconversion coherent random laser was realized by pumping macroporous erbium-doped lithium niobate with a 980 nm laser. The lasing threshold was determined to be about 40 k W∕cm~2.Above the threshold, the emission intensity increased sharply with the increasing pump intensity. Moreover, a narrow multi-peaks structure was observed in the green-light-emission band, and the positions of lasing lines were various at different angles. The results were the direct evidences of coherent random lasing emission from macroporous erbium-doped lithium niobate. These phenomena were attributed to the coexistence of upconversion emission and a multiple scattering feedback mechanism. 展开更多
关键词 solid-state green-light-emitting upconversion coherent random laser in macroporous LiNbO3:Er LN ETU
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吸水性树脂在固态上转换材料中的应用研究 被引量:1
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作者 汪彩虹 陈硕然 +4 位作者 葛婕 马金锁 郑道远 叶常青 王筱梅 《苏州科技大学学报(自然科学版)》 CAS 2019年第1期43-47,共5页
采用5,10,15,20-四苯基卟啉钯(PdTPP)作光敏剂,9,10-二苯基蒽(DPA)作发光剂,二者溶于有机溶剂后再分散到含表面活性剂吐温20(Tween-20)的水溶液中制得水包油(O/W)型微乳液,具有三维网状多孔结构的聚丙烯酸钠吸水性树脂可高效吸附该微乳... 采用5,10,15,20-四苯基卟啉钯(PdTPP)作光敏剂,9,10-二苯基蒽(DPA)作发光剂,二者溶于有机溶剂后再分散到含表面活性剂吐温20(Tween-20)的水溶液中制得水包油(O/W)型微乳液,具有三维网状多孔结构的聚丙烯酸钠吸水性树脂可高效吸附该微乳液,得到固态上转换树脂。对该上转换树脂进行了光物理性能研究,荧光光谱显示其上转换发光峰位于447 nm处,并观察到肉眼可见的上转换蓝色光。随着温度变化,树脂中含有的微乳液由O/W型可逆转化为W/O型微乳液,该相转变可促进上转换体系中的三线态-三线态能量传递(TTET)和三线态-三线态湮灭(TTA)过程,使上转换效率提高。聚丙烯酸钠吸水性树脂作为一种新型TTA上转换载体,制备方法简单,可在有氧环境下获得高效稳定的上转换发光,在光电材料中具有广泛的应用前景。 展开更多
关键词 tta上转换 O/W型微乳液 聚丙烯酸钠 吸水性树脂 表面活性剂
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聚二甲基硅氧烷基上转换材料的制备与光催化应用 被引量:1
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作者 吴振伟 陈佳 +4 位作者 韩鹏举 陈硕然 宋飒飒 叶常青 王筱梅 《精细化工》 EI CAS CSCD 北大核心 2019年第11期2171-2176,共6页
将光敏剂四苯基卟啉钯(Pd TPP)和湮灭剂9,10-二苯基蒽(DPA)溶解于甲苯,在Tween 20的乳化作用下与去离子水配制成O/W上转换微乳液;进一步与二甲基硅氧烷共混,将O/W上转换微乳液体系负载于固化后的聚二甲基硅氧烷(PDMS)中,制得基于三线态... 将光敏剂四苯基卟啉钯(Pd TPP)和湮灭剂9,10-二苯基蒽(DPA)溶解于甲苯,在Tween 20的乳化作用下与去离子水配制成O/W上转换微乳液;进一步与二甲基硅氧烷共混,将O/W上转换微乳液体系负载于固化后的聚二甲基硅氧烷(PDMS)中,制得基于三线态-三线态湮灭(TTA)机制的PDMS固态上转换树脂材料。在半导体激光器(532nm,60m W/cm^2)激发下,固态上转换材料可发射强的绿转蓝上转换荧光,固态上转换效率最大可达22%。将该材料应用于光电流响应和光催化降解过程中:三电极体系在PDMS固态上转换树脂上转换荧光的照射下,获得了0.9μA的光电流,证明了光电流的产生源于上转换蓝光对ZnCdS薄膜的照射;Pt/WO3粉末存在和固态上转换蓝光照射的条件下,罗丹明B染料降解作用显著,最大光降解效率达到82.3%。 展开更多
关键词 tta固态上转换 光电流响应 光催化降解 聚二甲基硅氧烷 O/W型微乳液 功能材料
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Upconversion photoluminescence properties of SrY_2O_4:Er^(3+),Yb^(3+) under 1550 and 980 nm excitation
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作者 沈显良 邢明铭 +3 位作者 田莹 付姚 彭勇 罗昔贤 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第5期458-463,共6页
Er^3+/Yb^3+ co-doped SrY2O4 phosphors with high color purity and brightness were successfully synthesized via a solid-state reaction method.Luminescence spectrum studies showed that the main red peaks and the minor ... Er^3+/Yb^3+ co-doped SrY2O4 phosphors with high color purity and brightness were successfully synthesized via a solid-state reaction method.Luminescence spectrum studies showed that the main red peaks and the minor green peaks of upconversion emissions were located at approximately 634–681 nm and 543–570 nm,respectively,corresponding to the transitions of ~4F(9/2)→~4I(15/2) and ~4S(3/2)→~4I(15/2) of Er^3+ ions.Under the excitation of 980 and 1550 nm lasers,the spectra of all of the samples exhibited similar peak positions but different intensities.When excited by the 980 nm laser,the intensity ratio of red to green emission increased with increasing Yb^3+ doping concentration and decreased with increasing excitation power.In the case of 1550 nm excitation,the intensity ratio of red to green emission increased with increasing Yb^3+ doping concentration and excitation power,thereby,improving the color purity of the red emission.The intensity of red emission was considerably stronger under 1550 nm excitation than that under 980 nm excitation.Therefore,the color of the proposed phosphors could be efficiently tuned by tailoring both the Yb^3+ doping concentration and excitation power. 展开更多
关键词 solid-state reaction method upconversion luminescence SrY2O4 Er^3+/Yb^3+ co-doped rare earths
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基于三线态-三线态湮灭的能量上转换 被引量:1
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作者 张幸林 杨会然 +3 位作者 孙会彬 刘淑娟 赵强 黄维 《化学进展》 SCIE CAS CSCD 北大核心 2012年第10期1880-1889,共10页
能量上转换近些年来引起了人们的广泛关注,具有许多方面的潜在应用,包括光伏技术、光合成、光催化和生物成像等。基于三线态-三线态湮灭(TTA)的能量上转换由于其具有激发光不需要是相干光,强度低,而且只要通过改变TTA过程中不同的敏化... 能量上转换近些年来引起了人们的广泛关注,具有许多方面的潜在应用,包括光伏技术、光合成、光催化和生物成像等。基于三线态-三线态湮灭(TTA)的能量上转换由于其具有激发光不需要是相干光,强度低,而且只要通过改变TTA过程中不同的敏化剂和受体,就能改变TTA上转换的激发光和发射光的波长等优点,有着广泛的应用前景。本文介绍了TTA上转换的机理,综述了TTA上转换近些年来的研究进展,总结了一些常用的敏化剂和受体,讨论了TTA上转换目前存在的问题及今后的发展方向。 展开更多
关键词 能量上转换 三线态-三线态湮灭 敏化剂 受体
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