共查询到20条相似文献,搜索用时 31 毫秒
1.
Xiaoluan Liang 《Journal of luminescence》2010,130(3):429-433
Phosphate glasses and glass ceramics doped with Er3+ and co-doped with Er3+-Tm3+ are presented in this work. The luminescence properties have been characterized by absorption, excitation and emission spectra. All samples excited by blue light could emit a combination of blue/green/orange/red wavelength giving white light. For Er3+-doped glasses, a self-quenching effect has been obtained and an adjustable tune comes out after crystallization. For co-doped glasses, the red emission at 651 nm has been enhanced due to the existence of Tm3+, which could be relative to both the overlapped emissions and the energy transfer from Tm3+ to Er3+. 相似文献
2.
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
3.
Tb3+ ions doped and Tm/Tb/Sm co-doped glasses for light-emitting-diodes (LED) applications have been synthesized by melt quenching method. Their photoluminescence properties were studied by emission and excitation spectra. The 5D3 and 5D4 emission of Tb3+ can be varied by adjusting Tb3+ concentrations and the compositions of glass matrix. Blue, green and reddish orange emission bands were observed in the emission spectra of Tm/Tb/Sm co-doped glasses. The combination of these emission bands allows the realization of white light when the glasses are excited by near ultraviolet light. In addition, the relative intensity ratios of respective emission lines are dependent on the composition of glasses and the excitation wavelength. 相似文献
4.
掺铒铋酸盐玻璃的光谱性质研究 总被引:12,自引:12,他引:0
研究了掺铒铋酸盐玻璃的吸收和荧光光谱性质,应用Judd-Ofelt理论计算了玻璃的三个强度参量Ωt=(t=2,4,6),分别为Ω2=3.71×10-20cm2,Ω4=1.86×10-20cm2,Ω6=1.28×10-20cm2,计算了Er3+离子的自发跃迁几率、荧光分支比等光谱参量.经荧光谱测试发现掺Er3+铋酸盐玻璃的荧光半高宽可达70nm.应用McCumber理论计算1.53μm处的受激发射截面可达9×10-21cm2.对Er3+离子在不同基质玻璃中光谱特性的比较发现,Er3+在铋酸盐玻璃中具有相对较高的受激发射截面和宽的荧光半高宽. 相似文献
5.
研究了Er3+离子掺杂钡镓锗玻璃的吸收光谱、拉曼光谱和上转换光谱.分析了Er3+离子在钡镓锗玻璃中的上转换发光机理.结果表明:玻璃的最大声子能量为828cm-1,紫外截止波长为275nm.采用800nm和980nmLD激发玻璃样品,在室温下观察到强烈的上转换绿光和红光发射.随着Er3+离子浓度的增加,绿光发光强度先增加后减小,而红光发光强度呈单调递增趋势.能量分析表明:800nmLD激发产生的绿光主要源于Er3+离子4I13/2能级的激发态吸收过程;红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程.980nmLD激发产生的绿光主要源于Er3+离子4I11/2能级之间的能量转移过程;而红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程和4I13/2能级的激发态吸收过程.通过量子效率分析,发现采用800nmLD激发Er3+离子掺杂浓度为1mol% 的样品时,上转换绿光发光效率最高.
关键词:
上转换发光机理
3+离子掺杂')" href="#">Er3+离子掺杂
钡镓锗玻璃 相似文献
6.
Amplified spontaneous emission spectra and light amplification spectra of some Nd3+:glass rods (silicate glass Schott LG680, phosphate glasses Schott LG760 and Hoya LHG5) are measured by pulsed flashlamp excitation. The spontaneous emission distribution, the stimulated emission cross-section spectra and the excited state absorption cross-section spectra are extracted. Excited state absorption prevents laser action around 1320 nm for the4F3/2-4L13/2 transition of Nd3+ in the investigated glasses. 相似文献
7.
《Journal of Physics and Chemistry of Solids》2003,64(5):841-846
The preparation of sodium phosphate glasses singly and doubly doped with rare earth ion Ce3+ and transition metal ion Mn2+ by a melt quench method is described. The spectroscopic characterizations of the samples are conducted by absorption, excitation, and emission spectra. The orange red emission of divalent manganese sensitized by trivalent cerium ions in a phosphate glassy matrix has been investigated. Energy transfer (ET) from optically excited Ce3+ to Mn2+ in sodium phosphate glass, by nonradiative process is confirmed by fluorescence studies with various activator concentrations. The mechanism of ET is mainly electric dipole–dipole in nature. 相似文献
8.
Er3+-doped oxyfluorotellurite glasses with four different concentrations of Er3+ ions have been prepared and investigated their thermal, optical absorption, excitation and luminescence properties. From the DSC spectra, glass transition and onset of crystallization temperatures have been found. Judd-Ofelt intensity parameters have been derived from the absorption spectrum and are in turn used to calculate radiative properties for the important luminescent levels of Er3+ ions. The calculated radiative properties are comparable to experimental values. The glasses show intense green and weak red emission under normal excitation with 451 nm. The decrease in emission intensities and lifetimes of the 4S3/2 level with concentration of Er3+ ions has been explained as due to energy transfer processes between Er3+ ions. The stimulated emission cross-sections and quantum efficiencies of the green and infrared emissions have been determined. The results indicate that the glasses may be suitable for use as a laser medium in making solid-state green laser by normal pumping route and as laser medium and optical amplifier in the 1.5 μm region. 相似文献
9.
Hongtao Sun Junjie Yang Junjie Zhang Zhonghong Jiang 《Solid State Communications》2005,133(12):753-757
Er3+-doped oxychloride germanate glasses have been synthesized by conventional melting and quenching method. Structural and thermal stability properties were obtained based on the Raman spectra and differential thermal analysis, indicating that PbCl2 plays an important role in the formation of glass network and has an important influence on the maximum phonon energy and thermal stability of host glasses. Intense green and red emissions centered at 525, 546, and 657 nm, corresponding to the transitions 2H11/2→4I15/2, 4S3/2→4I15/2, and 4F9/2→4I15/2, respectively, were observed at room temperature. With increasing PbCl2 content, the intensity of green (525 and 546 nm) emissions increases significantly, while the red (657 nm) emission increases slowly. The results indicate that PbCl2 has more influence on the green emissions than the red emission in oxychloride germanate glasses. The possible upconversion luminescence mechanisms has also been estimated and discussed. 相似文献
10.
A.S. Gouveia-Neto A.F. da Silva L.A. Bueno E.B. da Costa 《Journal of luminescence》2012,132(2):299-304
Rare-earth doped oxyfluoride 75SiO2:25PbF2 nano-structured phosphors for white-light-emitting diodes were synthesized by thermal treatment of precursor sol–gel derived glasses. Room temperature luminescence features of Eu3+, Sm3+, Tb3+, Eu3+/Tb3+, and Sm3+/Tb3+ ions incorporated into low-phonon-energy PbF2 nanocrystals dispersed in the aluminosilicate glass matrix and excited with UV light emitting diode were investigated. The luminescence spectra exhibited strong emission signals in the red (600, 610, 625, and 646 nm), green (548 and 560 nm), and blue (485 nm) wavelength regions. White-light emission was observed in Sm/Tb and Eu/Tb double-doped activated phosphors employing UV-LED excitation at 395 nm. The dependence of the luminescence emission intensities upon annealing temperature and rare-earth concentration was also examined. The results indicated that there exist optimum annealing temperature and activator ion concentration in order to obtain intense visible emission light with high color rendering index. The study suggests that the nanocomposite phosphor based upon 75SiO2:25PbF2 host herein reported is a promising contender for white-light LED applications. 相似文献
11.
研究了掺铒氟(卤)磷碲酸盐玻璃的吸收光谱和上转换荧光光谱,探讨了Er3+在 氟(卤)磷碲酸盐玻璃中的上转换发光机理.在975nm激光二极管抽运下产生强烈的上转换红光 及绿光,且红光的发光强度要远远大于绿光.以PbCl2取代PbF2后, 红光的发光强度下降,而绿光却没有明显变化;以ZnCl2取代ZnF2 达5mol%时,红光和绿光的发光强度均明显增大.
关键词:
氟(卤)磷碲酸盐玻璃
上转换发光
3+离子')" href="#">Er3+离子 相似文献
12.
《Journal of luminescence》1990,46(1):59-65
The upconversion of infrared radiation into green and red luminescence has been studied for Er3+ and Yb3+ ions in fluorohafnate glasses. At room temperature normalized upconversion efficiency of 8.4x10-4 cm2/W has been obtained for the green emission (545 nm) of Er3+ in doped samples containing 4.5 mol% (Yb3+) and 0.75 mol% (Er3+) pumped by 974 nm light with an absorbed intensity of 2.5 mW/cm2. Both green and red upconversion radiations slightly decrease with increasing temperature. Room-temperature measured efficiency is compared with the calculated one obtained from the rate equation model of Wright. 相似文献
13.
Chenxia Li Shiqing Xu Rengguang YeDegang Deng Youjie HuaShilong Zhao Songlin Zhuang 《Physica B: Condensed Matter》2011,406(9):1698-1701
Ho3+/Tm3+/Yb3+ tri-doped glass ceramics with white light emitting have been developed and demonstrated. Pumped by 980 nm laser diode (LD), intensive red, green and blue up-conversions (UC) were obtained. The green emission is assigned to Ho3+ ion and the blue emission is assigned to Tm3+ ion, whereas the red emission is the combination contribution of the Ho3+ and Tm3+ ions. The RGB intensities could be adjusted by tuning the rare-earth ion concentration and pump power intensity. Thus, multicolor of the luminescence, including perfect white light with CIE-X=0.329 and CIE-Y=0.342 in the 1931 CIE chromaticity diagram can be obtained in 0.15 Ho3+/0.2Tm3+/3Yb3+ tri-doped glass ceramics embedding BaF2 nanocrystals pumped by a single infrared laser diode source of 980 nm at 500 mW. The up-conversion luminescence mechanism of Yb3+ sensitize Ho3+ and Tm3+ ions and the energy transfer from Ho3+ to Tm3+ in oxy-fluoride silicate glass ceramics were analyzed. 相似文献
14.
The sample of Er3+/Yb3+ co-doped phosphate glass ceramic was prepared. At 975 nm laser diode (LD) excitation, the strong up-conversion (UC) emissions were observed, which were the UC green emission at 510–570 nm and the UC red emission at 636–692 nm, respectively. At low pump power (126 mW), the red emission is primary, and the color purity Rcp is 0.81. With the increasing of pump power, the emission color gradually varies from red to green. The intensity of the green emission is stronger compared to that of the red emission at high power (868 mW), and the color purity Rcp is 0.76. Thus, this material can be applied to fluorescence anti-counterfeiting by the color variety of UC emission under different pump power. 相似文献
15.
We examined basic luminescence properties and radiation response of sodium borate glass scintillators activated with Pb2+, Cu+, Ti4+, V5+, W6+ and Yb3+ ions, respectively. These glasses had more than 80% transparency for emission wavelength range, and strong absorption bands due to the charge transition of the ions were observed. In the photoluminescence spectra, all glasses demonstrated intense emission peak in visible region, which are corresponding to the ions with s2 (Pb2+), d10 (Cu+) and d0 (Ti4+, V5+, W6+) configuration. Additionally charge transfer emission was observed in Yb3+-doped glass. When 241Am 5.5 MeV alpha-ray excited the glasses, they showed weak emission intensity because of low energy transfer efficiency from host lattice to emission center. By 241Am irradiated pulse height spectra, Cu+-doped glass demonstrated the highest scintillation output in the glasses. 相似文献
16.
OH-对磷酸盐铒玻璃光谱性质的影响 总被引:11,自引:0,他引:11
本文系统研究了Yb3+、Er3+共掺磷酸盐铒玻璃中OH-含量与铒玻璃荧光寿命和光谱性质的关系.结果表明OH-基团的存在使得Er3+离子的荧光强度显著降低,荧光寿命大大缩短.比较了三种不同Al2O3含量(5mol%,8mol%和13mol%)的铒玻璃在2.9μm波长处的红外吸收系数与铒离子荧光寿命的关系,发现玻璃中OH-在2.9μm的吸收系数和Er3+的4Ⅰ13/2能级离子衰减速率成线性关系,不同Al2O3含量的玻璃具有不同Er3+和OH-基团的相互作用参量和不同的荧光寿命值及量子效率.并从玻璃结构上解释了Al2O3含量对除水机制和光谱性质的影响.经过充分除水后的铒玻璃荧光寿命可达到9.1ms. 相似文献
17.
The up-conversion emission properties of Yb3+-Ho3+ co-doped germanium-borate glasses have been investigated with 980 nm excitation. The violet, blue, green and red emission bands at about 350, 485, 544 and 653 nm can be identified, respectively. Experimental results indicated that the relative intensity ratios of the peaks IRed/IGreen increased with increasing B2O3 concentration, which led to changing color of up-conversion emission from green at x=0 to yellow at x=40, to red at x=60. The violet emission at 350 nm was first reported in germanium-borate glass host and up-conversion mechanisms of the emissions were discussed. The Yb3+-Ho3+ co-doped germanium-borate glasses could be an alternative for the generation of violet and primary colors for application in solid-state displays. 相似文献
18.
The thermal characterization and spectroscopic properties of Er3+-doped 0.6GeO2-(0.4-x)PbO-xPbF2 glasses were investigated experimentally. With the replacement of PbO by PbF2 the thermal stability of glasses is improved and the infrared fluorescence intensity at 1530 nm is increased. The Judd-Ofelt intensity parameters, radiative transition rates, and fluorescence lifetimes of the excited 4I13/2 level of Er3+ ions were calculated from Judd-Ofelt theory. The asymmetric ligand field around Er3+ ions resulted from the incorporation of PbF2 into germanate glasses, broadens the infrared emission spectra at 1530 nm. Upconversion luminescence in the investigated glasses was observed at room temperature under the excitation of 976 nm laser diode. The glass 0.6GeO2-0.3PbO-0.1PbF2 exhibits the maximum upconversion emission intensity, while no frequency upconversion luminescence was observed in the 0.6GeO2-0.4PbO glass. The quadratic dependence of the green and red emissions on excitation power indicates that two-photon absorption contributes to the visible emission under the 976-nm excitation. 相似文献
19.
The Er3+ -Yb3+ codoped in Li2O content tungsten -tellurite (TWL) transparent glasses are synthesized and measured the absorption, Raman and upconversion
luminescence (UPL) spectra. At room temperature intense green emission peak at 560 nm ( 4S3/2→4I15/2) and red emission peak at 670 nm ( 4F9/2→4I15/2) of Er3+ observed even at minimum 86 mW pumping power of infrared 980 nm excitation. For structure of the TWL glass, Raman spectrum
result revealed that an important role of WO3 in the formation of glass network linkage with Li2O. Under this influence estimated lifetime of the 4I11/2 of Er3+ was 1.89 μs and due to lower phonon energy of the glass produce strong upconversion signal. The effect of Er2O3 concentration on emission intensity result indicated that green emission intensity initially increase in compare to red emission.
Under the 980 nm pump power variation measured the relatively increases the red emission to the green emission intensity and
analyze the possible upconversion mechanism and process. 相似文献