Effects of Doping Trace Sm^3＋ and Gd^3＋ on Luminescent Character of Y2O2S：Eu^3＋

After trace Sm^3＋ ions and Gd^3＋ ions doping, the emission intensity of red phosphors Y2O2S： Eu^3 ＋ was enhanced and the voltage character （relation between emission intensity and excitation voltage） was improved while the other properties of physics and chemistry were not changed. The origins of enhancement and improvement are discussed. Probably the distortion and the defect of crystals are decreased by the substitution of Gd^3＋ for Y^3＋ instead of Eu^3＋ for Y^3＋ , and thus the Eu^3＋ crystal field is improved, and radiationless process and energy loss resulted from crystal defect are weakened, which leads to increased luminescence intensity and voltage character improvement. The overlapping fluorescent spectra of Y2O2S： Sm^3＋ emission and Y2O2S：Eu^3＋ excitation as well as Eu^3 ＋ excitation spectra transitions spectra lead to energy transfer from Sm^3 ＋ sensitization of Sm^3＋ ions fectively. containing Sm^3＋ excitation the possibility of resonance ions to Eu^3＋ ions, and the to Eu^3＋ ions is achieved effectively.     

Eu^3＋在（GdO）3BO3中的发光特性

研究了紫外光（ＵＶ）和阴极射线（ＣＲ）激发下（ＧｄＯ）＿３ＢＯ＿３：Ｅｕ的发光特性及其光谱随组成和结构变化的规律。在这两种激发条件下，（ＧｄＯ）＿３ＰＯ＿３中的Ｅｕ￣（３＋）均能发出明亮的红色荧光。ＣＲ激发下，在加速电压１０～２０ｋＶ、电流密度１～５μＡ／ｃｍ￣２内，Ｅｕ￣（３＋）的发光亮度与电压或电流密度之间均呈良好的线性关系，并具有耐电子束轰击的能力。根据３９５ｎｍＵＶ激发下（Ｇｄ＿（１－ｘ）ＥｕｘＯ）＿３ＢＯ＿３体系中Ｅｕ￣（３＋）的５Ｄ＿１→￣７Ｆ＿１跃迁（５３５ｎｍ）及￣５Ｄ＿ｏ→￣７Ｆ＿２跃迁（６１１ｎｍ）发射强度与Ｅｕ￣（３＋）浓度的关系，证明其浓度猝灭机理分别为电偶极－电偶极相互作用和交换作用。     

A white long-lasting phosphor Y2O2S： Tb^3＋ , Sm^3＋： an improvement of Y2O2S：Tb3＋

As an improvement of reported Y2O2S：Tb^3＋, a white-light long-lasting phosphor： Y2O2S：Tb^3＋, Sm^3＋ was prepared by the solid-state reaction. The photo-luminescence spectra showed that the position and shape of Tb^3＋ and Sm^3＋ emissions under UV excitation were similar in this host, which ensured a stable white emission color （daylight standard of IEC） under different excitations. The decay curves of co-doped samples indicated that the decay times of emissions of the two ions were close. The thermo-luminescence measurement suggested that the traps created by the doped Sm^3＋ ions were helpful to postpone the white afterglow of co-doped samples. Therefore, the function of co-doped Sm^3＋ ions was confirmed as improving the white emission colors of samples and acting as new trap centers.     

Luminescent and Thermal Properties of Sm^ 3＋ Complex with Salicylate and o-Phenanthroline Incorporated in Silica Matrix

A ternary Sm（ Ⅲ ） complex with salicylate （sal-） and o-phenanthroline （phen） was synthesized and incorporated in silica matrix by sol-gel method. The luminescence behavior of the complex in silica gel was studied compared with that of the pure complex by means of emission, excitation spectra and thermogravimetic analysis. The results indicate that the fluorescence intensity ratio of the ^4G5/2→^6H9/2 transition to the ^4G5/2→^6H5/2 transition in silica gel doped with Sm（sal）3 （phen） is lower than that of the pure Sm（sal）3（phen）. The thermal stability of Sm（sal）3（phen） is enhanced greatly by the introduction of the complex into silica matrix. An isolated and chemical inert environment of the complex appears to be responsible for the thermal stability enhancement in silica gel.     

Ca3La3（BO3）5基质中Tb^3＋的光致发光

在２５４ｎｍ紫外光激发下，研究了Ｃａ３Ｌａ３（ＢＯ３）５基质中Ｔｂ＾３＋的激发光谱，发光光谱、发光寿命与Ｔｂ＾３＋的４ｆ＾８→４ｆ＾７５ｄ＾１允许迁的激发带位于２３０～２６０ｎｍ光谱区，故Ｔｂ＾３＋能很好地吸收激活能而发光，成为一种有发展前途的绿粉。Ｃｅ＾３＋可能与Ｔｂ＾３＋争夺激活能而猝灭Ｔｂ＾３＋的发光，一定量的Ｄｙ＾３＋能敏化Ｔｂ＾３＋的发光。     

Eu^3＋在钒磷酸钆中的发光

本文研究了Ｅｕ＾３离子在钒磷酸中的发光。通过实验，确定了Ｙ（Ｐ．Ｖ）Ｏ４：Ｅｕ＾３＋的最佳合成条件。研究了助熔剂种类、浓度、激活剂浓度对体系发光效果的影响。     

CaTiO_3∶Pr~(3+)的合成及发光特性

本文采用高温团相反应合成TCaTiO3∶Pr3+红色发光材料、报道了Pr3+激活的CaTiO3的光谱特征及长余辉特性，并与CaS∶Eu的光谱特性及长余辉进行了比较。CaTiO3∶Pr3+将是一种具有广泛用途的新材料     

CaTiO3：Pr^3＋的合成及发光性质

报道了稀土离子Ｐｒ＾３＋激活的ＣａＴｉＯ３发光材料的合成方法ＣａＴｉＯ３：Ｐｒ＾３＋位于６１３ｎｍ发射与Ｐｒ＾３＋离子＾１Ｄ２－＾３Ｈ４和光谱发射相一致，讨论了不同合成条件对ＣａＴｉＯ３：Ｐｒ＾３＋发光性持的影响。Ｃ     

GaN:Eu,Dy薄膜的结构和发光特性研究

通过离子注入方法制备了一系列稀土Eu和Dy掺杂的GaN薄膜,研究了其结构、发光特性和能量传递机制。拉曼(Raman)光谱和X射线衍射(XRD)的研究一致表明：当Eu剂量保持不变时,随着Dy剂量增加,GaN晶格应变出现了先张应变后压应变的变化趋势。阴极荧光(CL)光谱表明：Eu,Dy共掺GaN样品的发光峰和单掺GaN样品的发光峰基本一致,这说明Eu和Dy共掺时并没有显著改变彼此的局域晶体场环境。在GaN中,对于Eu离子,⁵D₀→⁷F₂跃迁所对应的625 nm发光最强;对于Dy离子,⁴F_9/2→⁶H_13/2对应的583 nm发光最强。在Eu离子剂量保持不变的情况下,随着Dy离子注入剂量的增加,583 nm的发光逐渐变强,而625 nm的发光变弱。进一步,结合计算分析表明Eu离子主要通过电偶极-电偶极共振方式传递能量给Dy离子。最后发现随着离子注入剂量的改变,发光颜色在白色和红色间变化,色温在3889～4839 K变化...     

新型Eu3+三元复合发光材料研究

合成了一种新型三元复合物Eu^3 －AAOM－TTA[TTA：2－噻吩甲酰三氟丙酮：聚丙烯酰胺（70％）／丙烯酸（30％），数均相对分子质量为10000]并测定了其荧光光谱。该三元复合物的发光强度比强发光物质NaEu(TTA)4的荧光强度还大，而且比二元复合物Eu^3 AAOM的发光强度大20倍，研究了合成条件对复合物发光强度的影响，该三元复合物是一种潜在的优良发光材料。     

掺杂Eu3+离子的YPO4的合成及其发光特性

用BPO4和稀土氧化物为原料，采用固相反应法合成了掺杂Eu^3 离子的YPO4，并用X射线粉末衍射对其结构进行了表征，X射线粉末衍射实验结果表明，YPO4属四方晶系，晶胞参数α=0.6894nm,c=0.6020nm，属I41/αmd(No.141)空间群，测定了其激发光谱和发射光谱，探讨了掺杂Eu^3 离子的YPO4的发光特性。     

红色荧光粉La2O3：Eu3＋的合成及发光性质

利用复合沉淀法制备了性能稳定的红色荧光粉La2O3：Eu3＋,同时研究了煅烧温度及掺杂Eu3＋浓度对La2O3：Eu。’发光性能的影响．通过X射线粉末衍射（XRD）和扫描电子显微镜（SEM）来表征荧光粉的晶体结构和颗粒大小及形貌：用激发光谱和发射光谱以及荧光衰减曲线来袁征荧光粉的荧光性能．结果表明：煅烧温度在900℃时,所制备样品为六方晶系La2O3：Eun;SEM图显示掺杂Eu0＋含量为5％的La2O3颗粒直径为15μm左右．最大发射波长和激发波长分别为626nm和396nm,发射光谱中596nm和626nm的发射峰对应的是Eu3＋离子的0D—F1和5D—F2跃迁,其荧光寿命为0．754ms．     

微波场作用下类球形亚超细 CaS:Sm3+的快速合成及其发光特性

在微波场作用下,快速合成了ＣａＳ：Ｓｍ＾３＋琥珀色荧光材料。系统考察了微波场对不同浓度Ｓｍ＾３＋离子掺杂的ＣａＳ：Ｓｍ＾３＋磷光体发光特性的影响。采用含Ｌｉ＾＋、Ｎａ＾＋、Ｋ＾＋、ＮＨ＾＋４四种不同＋１价阳离子的无机盐作助熔剂时,所得ＣａＳ基质平均粒径为２００～５００ｎｍ,且以采用Ｌｉ＾＋离子的无机盐作助熔剂制得的类球形亚超细ＣａＳ：Ｓｍ＾３＋磷光体荧光强度最强。将微波法与传统合成法进行了比较。     

掺杂Tb~(3 )的Ba_2WO_3F_4荧光体的合成及其发光特性

本文采用固相反应法合成了 Ba2 WO3F4及掺杂 Tb3 的 Ba2 WO3F4荧光体 ,测定其 X射线粉末衍射光谱、激发光谱和发射光谱。所合成的 Ba2 WO3F4荧光体为单斜晶系 ,属 CC空间群 (C4S) ,晶胞参数为 :a=1.15 11nm,b=0 .9382 nm,c=0 .7188nm,β=12 6 .0 5°。探讨了 Ba2 WO3F4及掺杂 Tb3 离子的 Ba2 WO3F4荧光体的发光特性     

Co-Precipitation Synthesis and Spectral Characteristics of Long Afterglow Phosphor Y2O2 S： Sm^3＋, Mg^2＋ , Ti^4＋

Y2O2S：Sm^3＋, Mg^2＋, Ti^4＋ phosphor was synthesized by co-precipitation method. The crystalline structure of all synthesized phosphors was investigated by XRD. The result showed that all synthesized phosphors had a hexagonal crystal structure, which was the same as Y2O2S. The emission spectrum and excitation spectrum were measured, and the effect of Sm^3 ＋ molar ratio on the spectra was discussed. The emission spectra of the phosphors showed three emission peaks due to typical transitions of Sm^3 ＋ （4G5/2→6HJ ,J = 5/2, 7/2, 9/2）, and the emission peaks at 606 nm was stronger than others. With the increase of Sm^3 ＋ molar ratio, the emission intensity was strengthened. The excitation peaks were ascribed to the representative energy transition 4f→4f of Ti^4＋ phosphor prepared by co-precipitation method was Sm^3＋ ions. The results indicated that the Y2O2S ： Sm^3＋ , Mg^2＋ , an efficient long afterglow phosphor.     

CaTiO_3∶Pr~(3 )的合成及发光性质

报道了稀土离子Ｐｒ３＋激活的ＣａＴｉＯ３发光材料的合成方法，ＣａＴｉＯ３∶Ｐｒ３＋位于６１３ｎｍ发射与Ｐｒ３＋离子１Ｄ２３Ｈ４光谱发射相一致。讨论了不同合成条件对ＣａＴｉＯ３∶Ｐｒ３＋发光性质的影响     

掺Ce~（3＋）、Tb~（3＋）的四硼酸铝钇的发光特性

本文采用固相反应法合成了一系列掺Ｃｅ￣（３＋）、Ｔｂ￣（３＋）的四硼酸铝钇（Ｙ＿（１－ｘ－ｙ）Ｃｅ＿ｘＴｂ＿ｙＡｌ（ＢＯ＿３）＿４）磷光体。测定了它们的结构、属于三方晶系、空间群Ｒ＿（３２）、Ｌｎ￣（３＋）离子处于六个氧形成的三棱柱中。测定了磷光体中Ｃｅ￣（３＋）、Ｔｂ￣（３＋）和Ｃｅ￣（３＋）－Ｔｂ￣（３＋）共掺时的光谱，观察到Ｃｅ￣（３＋）、的Ｓｔｏｋｅｓ位移相当小（～１７００ｃｍ￣（－１））、Ｔｂ￣（３＋）的能级劈裂较明显和Ｃｅ￣（３＋）能将能量传递给Ｔｂ￣（３＋），测定了磷光体中Ｃｅ￣（３＋）、的荧光寿命，探讨了Ｃｅ￣（３＋）－Ｃｅ￣（３＋）之间的能量传递。     

用于白光LED的荧光粉Sr3MgSi2O8:Eu2+的发光特性

使用高温固相法制备不同NH4Cl(作为助熔剂)加入量和不同Eu2+浓度的Sr3MgSi2O8:Eu2+,并研究其成相和发光性质.研究结果表明:NH4Cl加入量为24%时,样品为纯相,发光最强.Sr3MgSi2O8:Eu2+样品在近紫外区存在强激发带(250～400 nm),谱峰位于366 nm相应的发射谱带位于蓝光区(420～500nm),为一个不对称宽带,谱峰位于457 nm,该发射带由两个发射峰组成,其位置较接近,因此不能复合出白光,Sr3MgSi2O8:Eu2+仅适合作为紫外LED芯片激发的蓝光荧光粉.