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1.
采用石墨电阻加热的温梯法生长了V∶YAG晶体,晶体的不同部位呈现两种不同的颜色:浅绿色和黄褐色.通过对比分析不同颜色V∶YAG晶体的室温吸收光谱,推断出石墨发热体高温下扩散出来的C可以起到还原作用,提高晶体中Vt3e+tra离子的浓度,同时诱导了F心的形成.在1300℃下,对不同颜色的V∶YAG晶体进行真空退火处理,发现处于八面体格位中的V3+离子在热激发作用下与近邻的四面体格位Al3+离子存在置换反应,由此产生一定浓度的四面体格位V3+离子.同时,F心在退火过程中被完全消除,释放出来的自由电子被高价态的V离子俘获,可以进一步提高晶体中四面体格位V3+离子的浓度.  相似文献   

2.
采用石墨电阻加热的温梯法生长了V:YAG晶体,晶体的不同部位呈现两种不同的颜色:浅绿色和黄褐色.通过对比分析不同颜色V:YAG晶体的室温吸收光谱,推断出石墨发热体高温下扩散出来的C可以起到还原作用,提高晶体中V3+tetra离子的浓度,同时诱导了F心的形成.在1300℃下,对不同颜色的V:YAG晶体进行真空退火处理,发现处于八面体格位中的V3+离子在热激发作用下与近邻的四面体格位Al3+离子存在置换反应,由此产生一定浓度的四面体格位V3+离子.同时,F心在退火过程中被完全消除,释放出来的自由电子被高价态的V离子俘获,可以进一步提高晶体中四面体格位V3+离子的浓度.  相似文献   

3.
采用提拉法生长了Cr单掺和Cr,Mg共掺Al2O3晶体,后者具有900—1600nm的宽带吸收.研究了该吸收带在不同气氛、不同温度退火下的变化规律.通过建立合理的晶格缺陷模型,成功地解释了所有的实验结果,并确定Cr,Mg共掺Al2O3晶体红外波段宽吸收带属于八面体格位中的Cr4+离子. 关键词: 4+离子')" href="#">Cr4+离子 八面体格位 晶格缺陷  相似文献   

4.
黄莉蕾 《物理学报》1999,48(1):65-68
测定了Ce3+,Er3+∶YAG中Ce3+离子的吸收截面.用从能级跃迁速率方程和激光传输方程推出的表达式计算了1.6μm波长激光的阈值能量(功率)和斜率效率.表明在Ce3+,Er3+∶YAG中,Ce3+对Er3+离子的激光性能影响与激活离子Er3+的浓度、晶棒大小有关.短晶棒或浓度低的晶体加入Ce3+可降低Er 关键词:  相似文献   

5.
上转换白光材料在固态照明、液晶显示器和生物成像等领域展现出其他光源无法比拟的优势,倍受研究者们广泛关注.为此,本文采用水热法合成了一系列掺杂不同离子浓度的NaYF4∶Yb3+/Re3+/Tm3+(Re3+=Ho3+,Er3+)微米晶体.在980 nm近红外光激发下,通过调控掺杂离子的浓度,研究Ho3+/Tm3+及Er3+/Tm3+共掺杂单颗粒NaYF4微米晶体的白光发射特性.研究表明:在NaYF4∶Yb3+/Ho3+/Tm3+微米晶体中,通过调控Yb3+离子的掺杂浓度易于实现其白光发射;而在NaYF4∶Yb3+/Er3+/Tm3+微...  相似文献   

6.
Yb:YAG晶体的闪烁特性   总被引:1,自引:0,他引:1  
通过不同Yb3+掺杂浓度(5%~30%,原子数分数)的Yb:YAG晶体的阴极射线发光谱、衰减时间、光输出及其温度依赖关系的测量,研究了Yb:YAG晶体的闪烁性能.不同Yb3+掺杂浓度的Yb:YAG晶体具有不同的光输出和猝灭温度,光输出随Yb3+掺杂浓度的增大而降低,猝灭温度则随掺杂浓度的增大而升高.室温下Yb:YAG晶体的发光衰减时间较短,均小于50ns.Yb3+掺杂浓度为5%的Yb:YAG晶体具有较高的光输出和较低的猝灭温度.  相似文献   

7.
Ce:YAG晶体和透明陶瓷的光学和闪烁性能   总被引:1,自引:0,他引:1       下载免费PDF全文
采用温梯法生长了Ce:YAG晶体和真空烧结法制备了Ce:YAG透明陶瓷,并对晶体和透明陶瓷的光学和闪烁性能进行了对比研究.Ce:YAG晶体和陶瓷都具有位于230,340和460 nm波段的Ce3+离子的特征吸收带和540 nm附近的发射峰,但Ce:YAG晶体同时存在296和370 nm的色心吸收,其发射峰位于398 nm,而透明陶瓷中不存在.Ce:YAG晶体和陶瓷的X射线荧光中均存在520 nm附近的Ce3+离子发射,但晶体中还存在由反格位缺陷引起的300 nm 关键词: Ce:YAG 闪烁晶体 透明陶瓷  相似文献   

8.
采用高温固相法合成了发光材料Ca2GeO4 ∶Eu3+ ,并详细研究了其紫外-真空紫外发光特性. 发现并解释了Eu3+ 离子在空气中的自还原以及在不同波长激发下的颜色转换现象. Ca2GeO4 ∶Eu3+ 在163—230和301,466 nm处具有强激发带,表明Ca2GeO4 ∶Eu3+ 关键词: 2GeO4 ∶Eu3+')" href="#">Ca2GeO4 ∶Eu3+ 光致发光机理 空气中自还原 颜色转换  相似文献   

9.
Yb3+离子掺杂浓度对Yb∶YAG晶体发光及荧光寿命的影响   总被引:3,自引:3,他引:0  
毛艳丽  丁菲  顾玉宗 《光子学报》2006,35(3):365-368
研究了不同掺杂浓度Yb∶YAG晶体的发光特性和荧光寿命.Yb3+在YAG晶体中的掺杂浓度分别为5at%、10at%、20at%、30at%.Yb3+离子掺杂浓度越高,Yb∶YAG晶体的吸收系数越大.采用940 nm波长的LD泵浦源和TRIA X550荧光谱仪,对这一系列掺有不同浓度Yb3+的Yb∶YAG晶体进行了荧光光谱的测定.结果表明:在1030 nm主发光波段的荧光强度以10at%Yb∶YAG的为最强.同时发现它在450 nm-680 nm波段有明显的可见发光,其强度随Yb3+掺杂浓度的增加而迅速地增强.Yb∶YAG晶体的荧光寿命存在浓度猝灭现象,对猝灭机制进行了分析研究,指出浓度猝灭的主要原因是合作发光和痕量稀土离子的上转换发光.  相似文献   

10.
杨帆  潘尚可  丁栋舟  吴云涛  任国浩 《物理学报》2011,60(11):113301-113301
文章用提拉法生长出Li6Gd(BO3)3:Ce晶体,并对其光谱性能与发光过程进行了探索. 借助于真空紫外-紫外透过光谱测试,发现晶体的透过光谱中存在Ce3+离子和Gd3+的特征吸收峰,同时还存在与Ce4+离子相关的电荷迁移带. 对晶体的真空紫外-紫外激发发射光谱进行研究发现,在晶体存在着Ce3+离子的5d→4f辐射跃迁发光与Gd3+离子的4f→4f辐射跃迁发光,而且存在着Gd3+→Ce3+之间的能量传递. 对Li6Gd(BO3)3:Ce晶体的X射线与γ射线激发发射光谱研究可知,晶体在高能射线激发下的闪烁光主要是Ce3+离子的发光. 关键词: 6Gd(BO3)3:Ce晶体')" href="#">Li6Gd(BO3)3:Ce晶体 真空紫外-紫外透过光谱 真空紫外-紫外激发发射光谱 能量传递  相似文献   

11.
The optical absorption spectra of crystals with garnet structure (A3B2C3O12), containing V or Cr impurity ions, before and after oxidation annealing, γ irradiation, and coactivation with Ca and Mg ions have been experimentally and theoretically investigated. It is shown that V3+ and Cr4+ ions are incorporated into both octahedral and tetrahedral sites of the garnet lattice. The absorption spectra and energy level diagrams of impurity ions are identified.  相似文献   

12.
采用传统提拉法单晶生长技术成功生长出了Cr,Mg:GSGG晶体, 并对生长出的晶体样品进行了氧化气氛和还原气氛退火处理. 通过对比分析退火处理前后样品吸收光谱的变化, 推断出晶体中四面体配位Cr4+离子的形成机理为: 晶体生长和高温氧化气氛退火的过程中, 四价Cr4+离子首先在八面体格位上形成, 然后在热激发作用下与邻近四面体格位上的Ga3+离子发生置换反应, 从而形成一定浓度的四面体配位Cr4+离子. 实验结果还表明, 随着电荷补偿离子Mg2+离子浓度的增大, 更有利于提高四面体配位Cr4+离子的浓度.  相似文献   

13.
We investigated the effect of cerium oxide on the precipitation of Ag nanoparticles in silicate glass via a femtosecond laser irradiation and successive annealing. Absorption spectra show that Ce3+ ions may absorb part of the laser energy via multiphoton absorption and release free electrons, resulting in an increase of the concentration of Ag atoms and a decrease of the concentration of hole-trapped color centers, which influence precipitation of the Ag nanoparticles. In addition, we found that the formed Ag0 may reduce Ce4+ ions to Ce3+ ions during the annealing process, which inhibits the growth of the Ag nanoparticles. PACS 78.55.Qr; 78.67.Bf; 81.05.Pj  相似文献   

14.
20 at.% Yb:YAG single crystals have been grown by the CZ method and gamma-ray irradiation induced color centers and valence change of Fe3+ and Y b3+ ions in Yb:YAG have been studied. One significant 255 nm absorption band was observed in as-grown crystals and was attributed to Fe3+ ions. Two additional absorption (AA) bands located at 255 nm and 345 nm, respectively, were produced after gamma irradiation. The changes in the AA spectra after gamma irradiation and air annealing are mainly related to the charge exchange of the Fe3+, Fe2+, oxygen vacancies and F-type color centers. Analysis shows that the broad AA band is associated with Fe2+ ions and F-type color centers. The transition Y b3+→Y b2+ takes place as an effect of recharging of one of the Y b3+ ions from a pair in the process of gamma irradiation.  相似文献   

15.
The glasses of the composition 10ZnO-30ZnF2-60B2O3 doped with different concentrations of CoO were prepared. Differential scanning calorimetric (DSC) studies, optical absorption, photoluminescence and infrared spectra of these glasses have been carried out. DSC studies have indicated that the resistance of the glass against devitrification increases with the increase in the concentration of CoO. Optical absorption spectra have exhibited one octahedral band due to 4T1g(F)→2T1g(H) and two tetrahedral bands due to 4A2(4F)→4T1(4P) 4A2(4F)→4T1(4F) transitions of Co2+ ions at about 525, 570 and 1400 nm, respectively. As the concentration of CoO is increased the tetrahedral bands are observed to grow at the expense of octahedral band. The luminescence spectra have exhibited two emission bands in the spectral regions of 600-700 nm and 800-900 nm due to 4T1(4P)→4A2(4F) and 4T1(4P)→4T2(4F) tetrahedral transitions of Co2+ ions, respectively. With the increasing content of cobalt ions in the glass matrix, the half width and intensity of these bands are observed to increase. The analysis of the results of these two spectra coupled with IR spectra has indicated that as the concentration of CoO is increased in the glass matrix, the tetrahedral occupancy of cobalt ions dominates over the octahedral occupancy and increase the rigidity of the glass network.  相似文献   

16.
The influence of annealing treatments and gamma-ray irradiation on the absorption and fluorescence spectra of Cr:GSGG crystals grown by the Czochralski method has been investigated. Two absorption bands located near 686 nm and 1050 nm were weakened markedly after the crystal was re-annealed in H2 atmosphere, which is due to the Cr4+ ions being de-oxidized into Cr3+ ions. The other two weak additional absorption bands induced by gamma-ray irradiation appearing near 310 nm and 480 nm are ascribed to the Fe2+ ions and F-type color centers, respectively. In particular, the gamma-ray irradiation with a dose of 100 Mrad has an effect of improving slightly the luminescence properties of Cr:GSGG crystals. The improvement mechanism is analyzed and discussed.  相似文献   

17.
Conclusions Analysis of cobalt contributions to the Faraday rotation spectra in the series of (YCa)3(FeCoGe)5O12 garnet films enabled us to distinguish between single contributions of Co2+ and Co3 ions in tetrahedral sites. It appeared that even the high counterdopes of calcium do not suppress the occurrence of tetrahedral Co2+ ions, although their concentration is greatly reduced in comparison with the original samples not containing any Ca. Noteworthy is also a rather high content of tetrahedral Co3+ in the samples not containing calcium even in cases when Ge content exceeds that of Co ions.  相似文献   

18.
The charge states of the cobalt ions in TiO2 nanopowders with the anatase lattice are studied by soft X-ray absorption spectroscopy. It is found that, at a low cobalt impurity concentration (1.8 at %), the cobalt ions with an oxidation state 2+ are mainly located in the tetrahedral (T d ) environment of oxygen ions. Amorphous titanium dioxide exists on the sample surface before heat treatment. Annealing in vacuum or hydrogen leads to the enrichment of the nanoparticle surfaces with Co2+ ions, a change in the coordination of the remaining part of cobalt ions from octahedral to tetrahedral, stabilization of the anatase structure, and the disappearance of the amorphous phase. The crystal lattice of the samples with a relatively high cobalt concentration (12 at %) is distorted, and annealing does not cause the disappearance of the amorphous phase of TiO2. Cobalt is reduced to its metallic state upon hydrogen annealing of the samples with a high cobalt concentration.  相似文献   

19.
Hydroxyl-doped potassium chloride single crystals are colored electrolytically at various temperatures and voltages using a pointed cathode and a flat anode. Characteristic OH spectral band is observed in the absorption spectrum of uncolored single crystal. Characteristic O, OH, U, V2, V3, O2−-Va+, F, R2 and M spectral bands are observed simultaneously in absorption spectra of colored single crystals. Current-time curve for electrolytic coloration of hydroxyl-doped potassium chloride single crystal and its relationship with electrolytic coloration process are given. Production and conversion of color centers are explained.  相似文献   

20.
Trace amounts of trivalent vanadium in zinc oxide single crystals can be converted into divalent ions by heating the samples in an atmosphere of zinc vapor. The ESR spectra of V2+ have been investigated at low temperature and the parameters of the spin-Hamiltonian were determined by making use of a computer program. The parameter values for V3+ have been refined. The ions are assumed to be at substitutional Zn2+ sites.  相似文献   

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