共查询到20条相似文献,搜索用时 31 毫秒
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采用高温固相法合成了Ba3Tb(BO3)3和Ba3Tb(BO3)3:Ce3+两种绿色荧光粉,并研究了材料的发光性质.Ba3Tb(BO3)2材料呈多峰发射,发射峰位于439,493,547,589和629 nm,分别对应Tb3+的5D3→7F4和5D4→7F1=6,5,4,3跃迁发射,主峰为547 nm;监测547 nm发射峰,所得激发光谱由4f75d1宽带吸收(200-330 nm)和4f4f电子吸收(330-400 nm)组成,主峰为380 nm.以Ce3+激活Ba3Tb(BO3)3,所得Ba3Tb(BO3)3:Ce3+与Ba3Tb(BO3),材料的发射光谱分布相同,但发射强度明显增强,说明Ce3+对Tb3+产生了很好的敏化作用;监测547 nm最强发射峰,所得激发光谱为宽带,主峰位于360 nm.改变H3BO3量,Ba3Tb(BO3)3:Ce3+材料的发射强度随之变化,当H3BO3过量15 wt%时,发射强度最大.上述研究结果表明Ba3Tb(BO3)3:Ce3+是一种很好的适于UV-LED管芯激发的白光LED用绿色荧光粉. 相似文献
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首次用X射线激发YALO_3:Nd~(3+)的光致发光(X-ray excited optical luminescence, XEOL),观察到在液氮温度(LNT)和室温(RT)下的一系列荧光谱,指认了这些谱线,并从此定出了一些新的高斯塔克能级。 相似文献
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用紫外可见光谱(UV/Visible Spectra)测试并研究了坩埚下降法生长的LiNbO3、Fe:LiNbO3,以及Zn:Fe:LiNbO3晶体的吸收特性。分析了产生这些吸收特性的原因以及与工艺生长方法的内在联系。研究结果表明:LiNbO3单晶沿晶体生长方向,其紫外吸收边向长波方向移动,且在350—450nm波段的吸收也逐渐增大,这是由于Li的分凝与挥发,逐渐产生缺锂所造成的;在Fe:LiNbO3单晶中观察到Fe^2 离子在480nm附近的特征吸收峰,并发现沿生长方向,Fe^2 离子的浓度逐渐增加,这与提拉法生长得到的晶体不同;在Fe:LiNbO3单晶中掺入质量分数为1.7%ZnO后,吸收边位置发生蓝移,而掺杂质量分数达到3.4%时,观察到有红移现象。Fe^2 离子在Zn:Fe:LiNbO3单晶中的浓度与ZnO掺杂量有密切关系。在掺杂质量分数1.7%ZnO的Fe:LiNbO3单晶中,Fe^2 离子从底部到顶部的浓度变化比在掺杂质量分数3.4%ZnO晶体中大,这是由于Zn^2 抑制Fe^2 离子进入Li位的能力随掺杂量的增加而逐渐减弱造成的。就该下降法工艺技术对Fe^2 离子在晶体中的浓度分布的影响作了分析。 相似文献
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Cr:LiNbO_3PlanarWaveguide¥ZHUShengxiang;JIANGXuyang;QIUYuanwu(PohlInstitute,TongjiUniversity,shanghai200092)WUYongjian;XUZhen?.. 相似文献
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Y.J. Chen Y.F. Lin J.H. Huang X.H. Gong Z.D. Luo Y.D. Huang 《Optics Communications》2012,285(5):751-754
Efficient eye-safe 1.6 μm monolithic laser was realized in a c-cut, 0.7-mm-thick Er3+:Yb3+:YAl3(BO3)4 microchip end-pumped by a quasi-continuous-wave 970 nm diode laser. At incident pump peak power of 20.4 W, a maximum output peak power of 2.6 W with a slope efficiency of 19% was obtained when the waist radius of pump laser beam was 220 μm. The spectra and profiles of output beam of the Er3+:Yb3+:YAl3(BO3)4 monolithic laser were measured. The influences of the waist radius of pump laser beam on the slope efficiency and threshold of the monolithic laser were also investigated. 相似文献
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采用微乳液法合成了Ce3 ,Tb3 单掺和双掺KZnF3纳米晶。分析了样品的结构与形态,结果表明,所合成的样品均为单相,颗粒粒度分布均匀。讨论了光谱特性,并与高温固相法合成的产物作了对比。研究发现,KZnF3:Ce3 纳米晶的发射光谱与体相多晶相比,最强峰位置红移约35nm;在KZnF3纳米晶双掺体系中存在Ce3 →Tb3 能量传递,尤其是Tb3 的5D4→7F5跃迁发射显著增强,有望成为一种有发展前途的绿色荧光材料。 相似文献
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Spectroscopic properties and excited-state absorption (ESA) of Ti3+ doped YAlO3 are investigated in detail. The fluorescence band is centered at 623 nm with a room-temperature lifetime of 11.4 s and a quantum efficiency nearby one. Till now laser action could not be detected because of strong excited-state absorption into a charge transfer band located 45 500 cm–1 above the Ti3+ ground state. At the Ar-laser pump wavelength the ESA cross-section is determined to be ESA=1×10–18 cm2. This value is a factor of 44 higher than the ground-state absorption cross-section. Consequently the pumping efficiency is decreased by one or two orders of magnitude. The Ti:YAlO3 results are compared with the spectroscopic data of Ti:Al2O3.Dedicated to Prof. Dr. Herbert Welling on the occasion of his 60th birthday 相似文献
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YAIO_3:Nd~(3+)的激光感生荧光 总被引:2,自引:1,他引:1
首次用Ar~+激光5145(在300K和90K下)和用染料激光5891(在300K下)激发YAlO_3:Nd~(3+)的感生荧光,并用Ar~+激光4880A激发了它的~4F~(3/2)→4I~(9/2)跃迁的荧光(在300K和90K下)。观察到在300K和90K下荧光相对强度的比值关系I_(R1→Z1)/I_(R2→Z1)的反转 相似文献
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当用582.6nm的黄色激激发Nd^3+:LaCl的^2G7/2+^4G5/2能级时,观察到了^4D3/2和^2G9/2能级的兰光和紫外发射。研究表明,^2D3/2上转换的机理是能量传递和激发态吸收而^2G9/2则是由于^4G5/2+^G5/2→^2G9/2+^F7/2交叉驰豫过程。通过对12K下^4D3/2→^4I11/2荧光衰减曲线的分析, 得到 能量传递几率为wt1=1468s^-1。测量和讨论了Nd^3+:LaCl3和NdCl3主要发光能级室温和12K下的寿命。 相似文献
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MA Dong-Ping ZHANG Ji-Ping 《理论物理通讯》2001,(10)
By taking into account all the irreducible representations and their components in the electron-phonon interaction (EPI) as well as all the levels and the admixtures of basic wavefunctions within d3 electronic configuration,the values of the parameters in the expressions of thermal shift (TS) from EPI for the ground level, R level and R line of SrTiO3:Mn4 have been evaluated; the R-line TS and various contributions to it have been calculated in the low-temperature region. It is found that all the three terms of R-line TS from EPI relevant to the lattice vibration are red shifts. The Raman term is the largest, the neighbor-level term is the second, and the optical-branch term is very small over the range of T ≤ 80 K. The contribution to R-line TS from thermal expansion has been approximately neglected in this work. The very strong EPI relevant to its lattice vibration for SrTiO3:Mn4 causes its R-line TS to be an unusually large red-shift. Only by taking into account the strong softening of the low-frequency acoustic modes of the lattice vibration at low temperatures, can we successfully explain the variation of R-line TS of SrTiO3:Mn4 with temperature.`` 相似文献
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An increase of the Nd~(3 ) doping concentration and an enhancement of the laser induced fluorescence in the single crystal of YAlO_3: (Lu~(3 ), Nd~(3 )) have been observed and are attributed to the size compensation effect. The low temperature (4.2K) fluorescence spectra indicate that the structure of the sharp lines arising from the radiative transitions of Nd~(3 ) ions is not changed by the existence of Lu~(3 ) ions, but the emission lines are inhomogeneously more broadened. Besides, it has been observed that the fluorescence due to the radiative transition from the Stark's sublevel R_2 of the metastable level ~4F_(3/2) to the sublevels Y_1 of the manifold ~4I_(11/2) decreases with decreasing temperature and the fluorescence arising from the transitions R_1→Y_1 is relatively increased. The experimental fact is qualitatively interpreted. 相似文献