Enhancement of up-conversion Yb3＋/Tm3＋/Er3＋ tri-doped tellurite glass luminescence properties in transparent oxyfluoride ceramics

Optically transparent Er3＋/Tm3＋/Yb3＋ tri-doped oxyfluoride tellurite based nano-crystallized glass ceramics with the batching composition of 73TeO2-15ZnO-7ZnF2-3YF3-1.5YbF3-0.3ErF3-0.2TmF3 （mol%） is prepared by a conventional melting quenching and the subsequent heat treatment processes. The sizes of grown nano-crystals in glass matrix appear to be smaller than 100 nm from the scanning electron mi- croscope measurement. Visible up-conversion luminescence of the as melted glass and glass ceramics is investigated. The three-color up-conversion luminescence intensities by 980-nm pumping are increased significantly due to the heat treatment, and the blue intensity increases with a higher magnitude than other wavelengths after heat treatment.     

Thermal stability and frequency up-conversion properties of Er~(3+)-doped oxyfluoride tellurite glasses

The thermal properties of 68TeO2-15BaF2-5SrF2-10LaF3-2KF glass were measured by different temperature analysis (DTA). Up-conversion luminescence of Er3 ion in the obtained glass was investigated. Mechanism of up-conversion emission was discussed. The result shows that the obtained oxyfluoride tel-lurite glass 68TeO2-15BaF2-5SrF2-10LaF3-2KF has a good thermal stability (△T = 153.6℃) and strong up-conversion green emissions around 527 nm and 549 nm and red emission at 660 nm. This glass can be a promising host material for up-conversion fiber lasers.     

Upconversion fluorescence spectroscopy of Er~(3+)-doped lead oxyfluorosilicate glass

Upconversion fluorescence emission of Er3+-doped oxyfluorosilicate glass excited at 975 nm is experimentally investigated. The results reveal that the intense green and red emission, and weak blue emission centered at 525, 543, 655, and 410 nm, respectively. A two-photon upconversion process is assigned to the green and red emission while a three-photon process is responsible for blue upconversion. The possible upconversion mechanisms are discussed based on excited state absorption and energy transfer between excited Er3+ ions. The intense upconversion fluorescence of Er3+-doped lead oxyfluorosilicate glass may be a potentially useful material for developing upconversion optical devices.     

Yb:铅锌镧碲酸盐玻璃的热学、光谱和激光性质

研究了摩尔组分为70TeO2₂-(20-x)ZnO-xPbO-5La2₂O3_{3-25K22O-25Na22O（x=0，5，10，15，20）的新型多元铅 锌镧碲酸盐激光玻璃，外掺Yb22O33为玻璃摩尔组分的1％.测试了 试样的物理性质及吸收光谱、荧光光谱和荧光寿命，计算了Yb3+3+的吸收截面、受激发射截面、荧光有效线宽等 关键词： 3+掺杂碲酸盐玻璃')" href="#">Yb3+³⁺掺杂碲酸盐玻璃 光谱性质 热稳定性}     

Preparation and spectral characterization of new Er3+-doped TeO2－B2O3－WO3－ZnO－ZnS glasses

Erbium-doped TeO_2-based oxysulfide glasses have been prepared in argon atmosphere in graphite crucibles. The results of thermal analysis and spectroscopic properties of Er^{3+} have been studied in terms of sulfide influence. As a function of composition, we have measured principally the optical absorption, spontaneous emission, and lifetime of the materials. Judd－Ofelt theory was introduced to calculate bandwidth and emission cross-section of Er^{3+}. The results demonstrate that addition of sulfide in tellurite glasses results in broad emission spectra, with high emission cross-section, slightly low emission lifetime and a comparatively high thermal stability as pure oxide glasses.     

Er3+掺杂重金属氧氟硅酸盐玻璃的上转换发光研究

研究了Er3+掺杂重金属氧氟硅酸盐玻璃的吸收光谱、上转换光谱和拉曼光谱，分析了重金属氧氟硅酸盐玻璃中Er3+的上转换发光机理. 结果表明：通过975nm的激光二极管激发，在室温下同时观察到蓝光(411nmj)、绿光(525和543nm)和红光(655nm)，分别是由于Er3+离子2H9/2→4I15/2, 2H11/2→4I15/2, 4S3/2→4I15/2, 和4F9/2→4I15/2跃迁. 随Er2O3浓度的增加，蓝光、绿光和红光的发光强度都增强，上转换发光机理主要涉及能量转移和激发态吸收，强烈的绿 关键词： Er3+离子 重金属氧氟硅酸盐玻璃 上转换光谱 发光机理     

Enhancement of upconversion luminescence due to the formation of nanocrystals in Er~(3+)-doped tellurite glasses

Optically transparent Er3 -doped tellurite-based nanocrystallized glasses with the composition of 70TeO2·15Li2O·15Nb2O5·0.5Er2O3 (mol) have been prepared by a conventional melting quenching and the subsequent heat treatment processes. The sizes of grown nanocrystals in glass matrix appear to be 35-50 nm from the X-ray diffraction (XRD) measurement. The microhardness measurement shows that the Vickers hardness values of the nanocrystallized tellurite glasses are larger (33%-62%) than those in the base glass. The Raman spectra imply that the maximum phonon energy of the based glass decreases and shifts from 668 to 638 cm-1 after heat-treatment. Visible upconversion luminescence and infrared luminescence of the base glass and heat-treated glasses under 980-nm laser diode (LD) excitation are investigated. The 524-, 546- and 656-nm upconversion intensities by 980-nm pumping increase significantly.     

Er3+掺杂重金属氧氟硅酸盐玻璃的上转换发光研究

研究了Er3 掺杂重金属氧氟硅酸盐玻璃的吸收光谱、上转换光谱和拉曼光谱 ,分析了重金属氧氟硅酸盐玻璃中Er3 的上转换发光机理 .结果表明 :通过 975nm的激光二极管激发 ,在室温下同时观察到蓝光 (4 1 1nmj)、绿光(5 2 5和 5 4 3nm)和红光 (6 5 5nm) ,分别是由于Er3 离子2 H9 2 →4 I1 5 2 ,2 H1 1 2 →4 I1 5 2 ,4 S3 2 →4 I1 5 2 ,和4 F9 2 →4 I1 5 2 跃迁 .随Er2 O3浓度的增加 ,蓝光、绿光和红光的发光强度都增强 ,上转换发光机理主要涉及能量转移和激发态吸收 ,强烈的绿光和红光激发是由于双光子吸收过程 ,而微弱的蓝光是由于三光子吸收过程 .拉曼光谱发现 ,对Er3 离子在重金属氧氟硅酸盐玻璃中的上转换发光 ,玻璃结构中的PbF2 起到重要作用     

Effect of concentration quenching on the spectroscopic properties of Er3+/Yb3+ co-doped AlF3-based glasses

A series of highly Er3+/Yb3+ co-doped fluoroaluminate glasses have been investigated in order to develop a microchip laser at 1.54 μm under 980 nm excitation. Measurements of absorption, emission and upconversion spectra have been performed to examine the effect of Er3+/Yb3+ concentration quenching on spectroscopic properties. In the glasses with Er3+ concentrations below 10 mol%, concentration quenching is very low and the Er3+/Yb3+ co-doped fluoroaluminate glasses have stronger fluorescence of 1.54 μm due to the 4I13/2 → 4I15/2 transition than that of Er3+ singly-doped glasses. As Er3+ concentrations above 10 mol% in the Er3+/Yb3+ co-doped samples, concentration quenching of 1.54 μm does obviously occur as a result of the back energy transfer from Er3+ to Yb3+. To obtain the highest emission efficiency at 1.54 μm, the optimum doping-concentration ratio of Er3+/Yb3+ was found to be approximately 1:1 in mol fraction when the Er3+ concentration is less than 10 mol%.     

Effect of concentration quenching on the spectroscopic properties of Er~(3+)/Yb~(3+) co-doped AlF_3-based glasses

A series of highly Er~(3+)/Yb~(3+) co-doped fluoroaluminate glasses have been investigated in order to develop a microchip laser at 1.54 μm under 980 nm excitation. Measurements of absorption, emission and upconversion spectra have been performed to examine the effect of Er~(3+)/Yb~(3+) concentration quenching on spectroscopic properties. In the glasses with Er~(3+) concentrations below 10 mol%, concentration quenching is very low and the Er~(3+)/Yb~(3+) co-doped fluoroaluminate glasses have stronger fluorescence of 1.54μm due to the ~4I_(13/2)→~4I_(15/2) transition than that of Er~(3+) singly-doped glasses. As Er~(3+) concentrations above 10 mol% in the Er~(3+)/Yb~(3+) co-doped samples, concentration quenching of 1.54μm does obviously occur as a result of the back energy transfer from Er~(3+) to Yb~(3+). To obtain the highest emission efficiency at 1.54μm, the optimum doping-concentration ratio of Er~(3+)/Yb~(3+) was found to be approximately 1:1 in mol fraction when the Er~(3+) concentration is l