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在980 nm激光激发下,Er3+/Yb3+共掺的发光材料既可以在可见光范围产生上转换发光,也可以在近红外波段产生下转换发光,二者存在竞争关系。本文利用熔融淬火法制备了一系列掺杂不同Er3+/Yb3+浓度的氟氧化物玻璃陶瓷,测量了样品在980 nm激光激发下的上转换及下转换发射光谱。研究发现,改变Er3+的掺杂浓度可以调控上下转换的发光强度。在此基础上,提出了上下转换发光的能量传递模型。本文的研究结果有利于该类材料在不同领域中的应用。 相似文献
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研究了ErYb共掺的氟氧化物玻璃陶瓷的直接上转换敏化发光现象,发现其上转换机理主要是 Er3+与Yb3+离子间的能量传递上转换而不是Er3+离子 的步进多光子吸收.研究发现由于稀土离子优先富集到PbxCd1-xF2微晶中,形成数个稀土离子组成的耦合团,使其存在强烈的团簇效应,一方面导 致了上转换荧光非常强,另一方面也导致了上转换荧光随抽运激光功率的对数变化F-P曲线 存在逐
关键词:
直接上转换敏化
氟氧化物玻璃陶瓷
上转换合作辐射荧光 相似文献
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用高温熔融法制备了Er3+/Yb3+共掺杂的45Bi2O3-45GeO2-10PbO玻璃,对玻璃样品进行了光谱测试,分析了上转换发光机制和Yb3+→Er3+的能量传递效率。通过Yb3+离子浓度对Er3+离子在铋酸盐玻璃中的上转换荧光强度影响的研究,得到Er3+质量分数为0.5%以及Yb3+质量分数为2.5%时上转换发光强度最大。研究结果表明,在970nm泵浦激发下,Er3+/Yb3+共掺杂B45G45P10玻璃在532,545,673nm处产生较强的上转换绿光和红光,是一种较为理想的上转换发光基质材料。 相似文献
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Yb3+/Er3+共掺杂TeO2-WO3-ZnO玻璃的光谱性质 总被引:3,自引:3,他引:0
制备了Yb3+/Er3+共掺杂的TeO2-WO3-ZnO玻璃,测量了Er3+在玻璃中的吸收光谱和970nmLD激发下的荧光光谱、荧光寿命和上转换光谱.计算了Yb3+/Er3+间的能量传递效率和Er3+离子1.5μm波段的吸收截面、发射截面,并研究了其荧光强度和上转换发光与Yb3+掺杂浓度间的关系.结果表明,Yb3+共掺杂可明显提高Er3+离子1.5μm发射的荧光强度,实验所得Yb3+离子的最佳掺杂浓度为Er3+离子浓度的3倍,在7.28×1020ions/cm3左右.Er3+离子1.5μm发射的荧光半峰全宽为67~72nm;上转换红、绿光均为双光子过程,随Yb3+掺杂浓度的增加,上转换红、绿光强度均增强. 相似文献
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高温熔制Er3+,Yb3+离子掺杂CaO-Y2O3-Al2O3-SiO2系统玻璃,并进行微晶化处理,研究了微晶玻璃中Er3+离子的发光及上转换发光特性,分析了微晶玻璃上转换发光机理.结果表明:原始玻璃经热处理得到了Er,Yb:YAG微晶玻璃,微晶玻璃中Er3+离子在室温下4I13/2→4I15/2跃迁产生横盖1450—1650nm区间的超宽带荧光,荧光半高宽达180nm,这可能由于YAG微晶相中Er3+离子与玻璃相中残留Er3+离子的共同发光;Er3+与Yb3+离子局域基质声子能量的降低使微晶玻璃Er3+离子上转换发光强度与原始玻璃相比显著提高,绿光、红光上转换荧光强度比玻璃样品分别增强约7和3倍;微晶化后Er3+,Yb3+离子局域环境发生变化也导致微晶玻璃中Er3+离子绿光、红光上转换发光相对强度发生变化.
关键词:
铒
镱:钇铝石榴石
微晶玻璃
荧光光谱 相似文献
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选用硅酸盐、硼酸盐以及磷酸盐3种常用的玻璃体系,与β-NaYF4:Yb3+,Er3+/Tm3+粉体均匀混合压片后在不同的温度(400~700 ℃)下进行热处理。采用X射线衍射技术和荧光光谱技术等测试手段研究不同玻璃形成体以及碱金属离子对β-NaYF4:Yb3+,Er3+/Tm3+粉体的侵蚀情况以及对发光性能的影响。研究结果表明,在硼酸盐玻璃体系与β-NaYF4:Yb3+,Er3+/Tm3+粉体复合热处理过程中,Li+和K+离子会取代β-NaYF4晶体中Na原子的位置。 在相同热处理温度下,不同玻璃体系与β-NaYF4晶体反应剧烈程度:磷酸盐>硼酸盐>硅酸盐。 相似文献
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Bin Dong Zi-An Li Baosheng Cao Naisen Yu Mengtao Sun 《Optics Communications》2011,284(10-11):2528-2531
The quasi-one dimensional (Q1D) Er3+–Yb3+ codoped single-crystal MoO3 ribbons with width range from 1 to 5 μm, and maximum length about 30 μm have been synthesized by the vapor transport method. The samples were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscope, and luminescence spectra. By a 975 nm laser diode (LD) as excitation source, the blue, green and red emission bands centered at about 408, 532, 553 and 657 nm were detected, which attributed to the 2H9/2 → 4I15/2, 2H11/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions of Er3+, respectively. The three-, and two-photon process was responsible for the blue, green and red up-conversion emissions mechanism for the Q1D Er3+–Yb3+ codoped single-crystal MoO3 ribbons, respectively. The results suggested that the Q1D Er3+–Yb3+ codoped single-crystal MoO3 ribbons will have potential applications in remote bio-imaging and surface enhanced Raman scattering. 相似文献
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Jung-Hyun Cho Michael Bass Suresh Babu Janet M. Dowding William T. Self Sudipta Seal 《Journal of luminescence》2012,132(3):743-749
The effects of Yb3+ doping on up conversion in Yb3+–Er3+ co-doped cerium oxide nanocrystals are reported. Green emission around 545 and 560 nm attributed to the 2H11/2, 4S3/2→4I15/2 transitions and red emission around 660 and 680 nm due to 4F9/2→ 4I15/2 transitions under 975 nm excitation were studied at room temperature. Both green and red emission intensities increase as the Yb3+ concentration increases from 0%. Emission strength starts to decrease after the Yb3+ concentration exceeds a critical amount. The green emission strength peaks around 1% Yb3+ concentration while the red emission strength peaks around 4%. An explanation of competition between different decay mechanisms is presented to account for the luminescence dependence on Yb3+ concentration. Also, the application of up converting nanoparticles in biomedical imaging is demonstrated. 相似文献
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通过固相反应法制备了Er3+/Yb3+共掺杂ZrO2-Al2O3粉末的样品,并对样品在980nm激光激发下的上转换发光特性进行了研究.从发射光谱可以发现,在可见光范围内有3个强的发光带,一个位于654nm附近的红光带和两个分别位于545nm、525nm附近的绿光带,分别对应于Er3+离子的以下辐射跃迁:4F9/2→4I15/2、4S3/2→4I15/2、 2H11/2→4I15/2.其中又以Er3+离子的4F9/2→4I15/2跃迁产生的红色荧光辐射最强.对其上转换发光机制进行了分析,发现这三个发光过程都是双光子过程.对样品粉末进行了XRD检测,发现ZrO2主要以立方相为主,并且计算得到了这种立方结构的晶格常数.Al2O3固溶于ZrO2中,Al3+嵌入ZrO2后产生氧空位,导致ZrO2晶体的对称性降低,这种结构变化更有利于提高上转换效率,即上转换发光强度增强.
关键词:
3+/Yb3+')" href="#">Er3+/Yb3+
上转换
2-Al2O3')" href="#">ZrO2-Al2O3
荧光
稀土 相似文献
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Degang Deng Shiqing Xu Shilong Zhao Chenxia Li Huanping Wang Haidong Ju 《Journal of luminescence》2009,129(11):1266-1270
A transparent Er3+–Tm3+–Yb3+ tri-doped oxyfluoride glass ceramics containing LiYF4 nanocrystals were prepared. Under 980 nm laser diode (LD) pumping, intensive red, green and blue upconversion (UC) was obtained. The blue, green, and red UC radiations correspond to the transitions 1G4→3H6 of Tm3+, 2H11/2/4S3/2→4I15/2, and 4F9/2→4I15/2 of Er3+ ions, respectively. This is similar to that in Tm3+–Yb3+ and/or Er3+–Yb3+ co-doped glass ceramics. However, the blue UC radiations of the Er3+–Yb3+ co-doped glass ceramics is two-photon process due to cooperative energy transfer. The UC mechanisms were proposed based on spectral, kinetic, and pump power dependence analyses. 相似文献
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This paper reports on the absorption, visible and near-infrared luminescence properties of Nd3+, Er3+, Er3+/2Yb3+, and Tm3+ doped oxyfluoride aluminosilicate glasses. From the measured absorption spectra, Judd-Ofelt (J-O) intensity parameters (Ω2, Ω4 and Ω6) have been calculated for all the studied ions. Decay lifetime curves were measured for the visible emissions of Er3+ (558 nm, green), and Tm3+ (650 and 795 nm), respectively. The near infrared emission spectrum of Nd3+ doped glass has shown full width at half maximum (FWHM) around 45 nm (for the 4F3/2→4I9/2 transition), 45 nm (for the 4F3/2→4I11/2 transition), and 60 nm (for the 4F3/2→4I13/2 transition), respectively, with 800 nm laser diode (LD) excitation. For Er3+, and Er3+/2Yb3+ co-doped glasses, the characteristic near infrared emission bands were spectrally centered at 1532 and 1544 nm, respectively, with 980 nm laser diode excitation, exhibiting full width at half maximum around 50 and 90 nm for the erbium 4I13/2→4I15/2 transition. The measured maximum decay times of 4I13/2→4I15/2 transition (at wavelength 1532 and 1544 nm) are about 5.280 and 5.719 ms for 1Er3+ and 1Er3+/2Yb3+ (mol%) co-doped glasses, respectively. The maximum stimulated emission cross sections for 4I13/2→4I15/2 transition of Er3+ and Er3+/Yb3+ are 10.81×10−21 and 5.723×10-21 cm2. These glasses with better thermal stability, bright visible emissions and broad near-infrared emissions should have potential applications in broadly tunable laser sources, interesting optical luminescent materials and broadband optical amplification at low-loss telecommunication windows. 相似文献
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Tellurite glasses (TeO2–ZnO–Nb2O5) mono-doped Er3+ and co-doped Er3+/Ce3+ have been prepared using the melt-quenching technique. To evaluate the effect of Ce3+ on the structural, thermal stability of glass hosts and fluorescence properties of Er3+, X-ray diffraction patterns, Ftir spectra, differential scanning calorimeter curves, absorption spectra, fluorescence emission spectra, fluorescence lifetimes, up-conversion emission spectra of glass samples were measured and investigated. Using Judd–Ofelt theory, we calculated intensity parameters (Ω2, Ω4 and Ω6), spontaneous emission probabilities, the radiative lifetime, luminescence branching factors and the quantum yield of luminescence for 4I13/2 → 4I15/2 transition. The co-doping with Ce3+ was effective on the suppression of up-conversion emission of Er3+ owing to the phonon-assisted energy transfer: Er3+:4I11/2 + Ce3+:2F5/2 → Er3+:4I13/2 + Ce3+:2F7/2 which contributed the effective enhancement of 1.53 µm fluorescence emission. The change in optical properties with the addition of Ce3+ ions have been discussed and compared with other glasses. Using the Mc Cumber method for the 4I13/2 → 4I15/2 transition, absorption cross-section, calculated emission cross-section, and gain cross-section values support that TZNEr1Ce1 glass is a potential material for developing broad-band and high-gain erbium-doped fiber amplifiers applied for 1.53 µm. 相似文献
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Deyan Kong Zewei Quan Jun Yang Piaoping Yang Chunxia Li Jun Lin 《Journal of nanoparticle research》2009,11(4):821-829
NaYF4:Yb3+, Er3+ nanoparticles were successfully prepared by a polyol process using diethyleneglycol (DEG) as solvent. After being functionalized
with SiO2–NH2 layer, these NaYF4:Yb3+, Er3+ nanoparticles can conjugate with activated avidin molecules (activated by the oxidation of the oligosaccharide chain). The
as-formed NaYF4:Yb3+, Er3+ nanoparticles, NaYF4:Yb3+, Er3+ nanoparticles functionalized with amino groups, avidin conjugated amino-functionalized NaYF4:Yb3+, Er3+ nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy
(AFM), Fourier transform infrared (FT-IR), UV/Vis absorption spectra, and up-conversion luminescence spectra, respectively.
The biofunctionalization of the NaYF4:Yb3+, Er3+ nanoparticles has less effect on their luminescence properties, i.e., they still show the up-conversion emission (from Er3+, with 4S3/2 → 4I15/2 at ~540 nm and 4F9/2 → 4I15/2 at ~653 nm), indicative of the great potential for these NaYF4:Yb3+, Er3+ nanoparticles to be used as fluorescence probes for biological system. 相似文献