Ce^3＋离子敏化Eu^3＋：Cr^3＋：Sm^3＋：YAG外延层的荧光现象

对Ce^3 :Eu^3 :Cr^3 :Sm^3 :YAG外延层中的荧光敏经现象进行了报道和分析，在较高浓度的Ce^3 离子掺杂时，外处层在蓝色、绿色波段出现了新的荧光谱线，可解释为在Ce^3 离子每化作用下，Eu^3 离子产生了由高位激发态能级^5Di(i=1,2,3）直接到基态能级^7Fj(j=0,1,2,3）的辐射跃迁过程，并且这种Ce^3 :Eu^3 :Cr^3 :Sm^3 :YAG外延层还是一种新颖的白色单晶荧光材料。     

A novel strong green phosphor： K3Gd（PO4）2：Ce^3＋, Tb^3＋ for a UV-excited white light-emitting-diode

A series of K3Gd1-x-y（PO4）2：xCe^3＋, yTb^3＋ phosphors are synthesized by the solid-sate reaction method. X-ray diffraction and photoluminescence spectra are utilized to characterize the structures and luminescence properties of the as-synthesized phosphors. Co-doping of Ce^3＋ enhances the emission intensity of Tb^3＋ greatly through an efficient energy transfer process from Ce^3＋ to Tb^3＋. The energy transfer is confirmed by photoluminescence spectra and decay time curves analysis. The efficiency and mechanism of energy transfer are investigated carefully. Moreover, due to the non- concentration quenching property of K3Tb（PO4）2, the photoluminescence spectra of K3Tb1-x（PO4）2：xCe^3＋ are studied and the results show that when x = 0.11 the strongest Tb^3＋ green emission can be realized.     

YAG晶体中Ce^3＋对Er^3＋的敏化作用

通过求解（Ｃｅ，Ｅｒ）：ＹＡＧ和Ｅｒ：ＹＡＧ的能级跃迁速率方程，讨论了Ｃｅ＾３＋对Ｅｒ＾３＋离子的敏化作用。表明掺Ｃｅ＾３＋可增强Ｅｒ＾３＋离子１．６６μｍ波长的激光强度，但仅改变了１．６６μｍ波长激光粒子数反转，即Ｎ２（＾４Ｉ１２／２）〉Ｎ１（＾４Ｉ１５／２）与Ｅｒ＾３＋离子浓度的关系。     

Ln（BO3,PO4）[Ln=La,Y]基质中Ce^3＋、Tb^3＋、Gd^3＋的光谱

研究了硼磷酸镧和硼磷酸钇基质中Ce^3 、Tb^3 、Gd^3 的发射光谱和激发光谱。结果表明：La(BO3,PO4):Ce,Tb体系中加入钆后,Ce^3 的 发射降低,Tb^3 的发射增强,Y（BO3,PO4）：Ce,Tb体系中加入钆后,Ce^3 和Tb^3 的发射均增强,且前者增加的幅度高于后者。因此在La(BO3,PO4):Ce,Tb,Gd体系中Gd^3 离子起着能量传递中间体和敏化剂的作用;在Y（BO3,PO4）：Ce,Tb,Gd体系中Gd^3 离子只起敏化剂作用,并且阻碍Ce^3 →Tb^3 的能量传递。与Y（BO3,PO4）：Ce,Tb,Gd相比,La(BO3,PO4):Ce,Tb,Gd对紫外吸收强,254nm激发下发出的光绿色纯度,强度大,更适合做荧光灯中的绿粉。     

结构稳定的高质量荧光材料CaAl4O7：Tb^3＋,Ce^3＋

在本文中制作了CaAl4O7:Tb^3 ,Ce^3 新荧光材料。烧结温度为1300℃,烧结环境为N2＋5％H2还原气。TEM实验结果表明样品的粒度小于1μm。X－射线和HRTEM实验证实,样品的晶格点阵十分规则,而且没有发现掺杂和助溶剂对基质结构的影响,表现出十分好的材料质量。光学实验观测到对应于Tb^3 离子的^5D4到^7FJ(J=6,5,4,3)的跃迁发射峰在485,545,590和630nm。CaAl4O7:Tb^3 ,Ce^3 降低了基质结构的不确定性,同时保持了Tb^3 发光中心的特性。     

Spectroscopic investigation of a new crystal： Nd^3＋,Yb^3＋：YVO4

The absorption and emission spectra of the YVO4 single crystal co-doped with 1 at.% Nd^3＋ and 1 at.% Yb^3＋ are investigated. The efficient Nd^3＋ → Yb^3＋ energy transfer and the back transfer （Yb^3＋ → Nd^3＋） are observed at room temperature. The fluorescence lifetime of the 4F3/2 level of Nd^3＋ in Nd,Yb：YVO4 is measured under 808 nm laser light excitation. The efficiency of Nd^3＋ → Yb^3＋ energy transfer in YVO4 is determined to be about 34%.     

Ca3Al2M3O12（M=Si,Ge）石榴石中Ce^3＋离子的荧光光谱

本文研究了Ｃａ３Ａｌ２Ｍ３Ｏ１２（Ｍ＝Ｓｉ，Ｇｅ）石榴石中Ｇｅ＾３＋离子的荧光光谱。在这两种石榴石中，Ｃｅ＾３＋的发射光谱均为Ｃｅ＾３＋的５ｄ→４ｆ能级跃迁发射宽谱带，但有很大差异。在锗酸盐中，Ｃｅ＾３＋的发射强度很弱，而在硅酸盐中发射强，２９５和７７Ｋ下在Ｃａ３Ａｌ２Ｓｉ３Ｏ１２中Ｃｅ＾３＋的荧光寿命分别为４６和４９ｎｓ。Ｇｄ＾３＋和助溶剂的引入可提高Ｃｅ＾３＋的发射强度。     

Ce^3＋可调谐固体紫外激光器研究进展

本文介绍了固体紫外可调谐激光的发展现状和研究进展,并对几种常用的掺稀土元素Ce^3 的紫外激光晶体的性质进行了介绍。     

硼酸镁中Ce^3＋,Gd^3＋对Dy^3＋发光的敏化作用

本文研究了铈、钆、镝激活硼酸镁的激发光谱、发射光谱、发光寿命和能量传递过程。     

Na2SrSiO4：Ce^3＋,Tb^3＋,Yb^3＋的制备及近红外量子剪裁发光性质

采用高温固相法制备了新型N a2SrS iO4：C e3＋,Tb3＋,Yb3＋的近红外发光材料。对样品可见和近红外激发光谱、发射光谱及荧光寿命的研究表明,N a2SrS iO4：C e3＋,Tb3＋,Yb3＋中存在高效的Tb3＋→Yb3＋的量子剪裁下转换效应,下转换量子效率约为182.4%。Ce3＋的共掺大大提高了样品的紫外光吸收,显著敏化了样品的近红外发光效率。研究了Ce3＋,Tb3＋和Yb3＋掺入量对其发光性质的影响。结果表明,当Ce3＋的浓度为2%,Tb3＋的浓度为13%和Y b3＋的浓度为16%时,样品的近红外发光最强。     

同步辐射与GGG：Nd^3＋晶体的相互作用

用北京同步辐射489A-VUV束线作为连续光源测定了GGG:Nd~(3+)晶体的短波吸收光谱。用束线4B9A-WX作为光源激发GGG:Nd~(3+),测定了它的XEOL(X-ray excited optical luminescence)。     

Enhanced NIR emission in Ce^3＋/Er^3＋-doped YAG induced by Bi^3＋ doping

Ce^3＋/Er^3＋/Bi^3＋ triply-doped yttrium aluminum garnet （YAG） is synthesized using co-precipitation method. The Bi^3＋ concentration-dependent near-infrared （NIR） emission behavior is systemically in- vestigated. The NIR emission of Er^3＋ ions at 1531 nm is enhanced threefold by the addition of 7 mol% Bi^3＋. Bi^3＋doping results in the formation of exciton in YAG and the variation in the local environment of the doped rare-earth ions. The enhancement in NIR luminescence is ascribed to the combined effects of the sensitization of exciton→Ce^3＋ →Er^3＋ and the Bi^3＋ doping-induced adjustment of the local environment for Ce^3＋ and Er^3＋ ions.     

白光LED用YAG：Ce^3＋荧光粉的温度猝灭性质

荧光粉的温度猝灭性质是影响白光LED的光效、光色参数和可靠性的关键因素之一。研究了不同激活剂浓度，不同元素掺杂的Y3-xCexAl5O12（YAG：Ce^3＋）荧光粉在460nm光激发下的变温亮度和发射光谱。结果表明温度显著影响YAG：Ce^3＋荧光粉的发光性能，随着温度的升高，发光强度下降，同时发射光谱红移。Ce含量为0．07（原子数分数）的YAG：Ce^3＋荧光粉，150℃下亮度值约为室温时的89％，200℃时的发射光谱相对室温的红移了约10nm。Ce含量的改变对YAG：Ce^3＋荧光粉的热猝灭性质影响较小。Lu的掺杂使YAG：Ce^3＋荧光粉的发射波长蓝移，同时会显著改善荧光粉的热猝灭性能。Gd的掺杂使荧光粉的发射波长红移，同时也会导致热猝灭性能的劣化。     

Y3Al5O12：Ce^3＋的合成及真空紫外发光性质

采用高温固相反应及共沉淀法合成Y3-xAl5O12:Ce3 x(x=0.01,0.03,0.05,0.07,0.09)黄色系列粉末状发光材料.经X射线衍射分析产物为单相,属立方晶系,其结果与JCPDS标准卡(88-2047)相符.分析了两种方法合成的粉末样品的SEM照片,发现共沉淀法不仅能降低合成温度,对细化粉体晶粒粒度也有较大作用.检测了材料的真空紫外激发光谱和发射光谱.发现,Y3Al5O12:Ce3 的真空紫外激发光谱,在100~300 nm范围内呈三个带状峰,峰值分别在126,177,230 nm附近.随着Ce3 含量x由0.01增加到0.05,YAG:Ce3 发射强度逐渐增加到最大值,之后随着x继续增加其发射强度逐渐下降,呈现明显的浓度猝灭现象.     

SrTiO3：Cr^3＋晶体荧光光谱及荧光寿命的热效应

测量了SrTiO~3:Cr(3+)晶体5～200K的荧光光谱和寿命。并用单声子吸收与发射过程相关的电子振动跃迁理论较好地解释了150K以下荧光寿命随温度变化的规律。     

Improved Fluorescence from Tm^3＋/Er^3＋/Ce^3＋ Triply Doped Bismuth-Silicate Glasses for S＋C-bands Amplifiers

Fluorescence of Tm^3＋/Er^3＋ codoped bismuth-silica （BS） glasses and the sensitization of Ce^3＋ are investigated, It shows that Ce^3＋ codoping with Tm^3＋/Er^3＋ in BS glasses results in a quenching of Tm^3＋ ion emission from ^3F4 to the ^3H6 level. Consequently, the 1.47μm emission occurs after the population inversion between the ^3H4 and ^3F4 levels. Furthermore, the codoped glasses show the broad emission spectra over the whole S and C bands with full-width at half-maximum （FWHM） up to about 119nm, as it combines 1.55μm emission band of Er^3＋ with 1.47μm emission band of Tm^3＋ under 800hm excitation.     

KAlF4：Ce,Tb磷光体的发光特性及Ce^3＋对Tb^3＋的敏化作用

采用溶液反应法和高温固相反应法合成了ＫＡ１Ｆ４基质化合物及ＫＡ１Ｆ：Ｃｅ，Ｔｂ磷光体，测定了磷光体的激发光谱和发射光谱，研究了在碱金属氟铝酸盐基质中Ｃｅ＾３＋对Ｔｂ＾３＋的能量传递，根据Ｃｅ＾３＋，Ｔｂ＾３＋在ＫＡｌＦ４中的能级关系，分析了其发光特性和Ｃｅ＾３＋对Ｔｂ＾３＋能量传递过程。     

氟锆酸盐玻璃中Tm^3＋和（Tm^3＋＋Ho^3＋）离子的光谱研究

给出氟锆酸（ＺＢＬＡＮ）玻璃中＾Ｔｍ＾３＋和Ｈｏ＾３＋离子的Ｑｔ参量，并与氧化物玻璃中Ｔｍ＾３＋和Ｈｏ＾３＋的Ｑｔ参量进行了比较，用３７５ｎｍ和４６８ｎｍ波长激发单掺ＺＢＬＡＮ中Ｔｍ＾３＋离子，获得来自Ｄ，２，＾３Ｈ４，Ｇ４能级不同发射波长的发光强度随掺杂浓度的变化，而用小于１μｍ的激发波长激发发单掺Ｔｍ＾３＋或Ｈｏ＾３＋样品，获得近红外区发射光谱。文中给出掺杂浓度对于Ｔｍ＾３＋和Ｈｏ＾＋近红外区     

Spectral Hole-Burning of Eu^3＋：Y2SiO5 Crystal at 16 K

By using an Ar^＋ ion laser, a tunable Rh 6G dye laser （linewidth 0.5cm^-1） pumped by the second harmonic of a YAG：Nd laser and a Coherent 899-21 dye laser as light sources and using a monochromator, a phase-locking amplifier and a computer as the data detecting system, we detect the optical properties of Eu^3＋-doped Y2SiO5 crystal. Persistent ,spectral hole burning （PSHB） are observed in the Eu^3＋ ions spectral lines （^5 Do-T Fo transition） in the crystal at the temperature of 16K. For 15mW dye laser burning the crystal for 0.1 s spectral holes with hole width about 80 MHz both at 579.62nm and at 579.82nm are detected and the holes can remain for a long time, more than 10h.