高温高压合成的硅酸锶有铕铋的发光特性

用高温高压方法合成了Ｓｒ２ＳｉＯ４Ｅ＾３＋ｕ，Ｂｉ＾３＋和ＳｒＳｉＯ３Ｅｕ＾３＋＿，Ｂｉ＾３＋，研究了合成压力对其发光性能的影响，与用溶胶－凝胶共沉淀法和常压高温法合成的产品作比较，常压制备的ＳｒＳｉＯ３Ｅｕ＾３＋，Ｂｉ＾３＋为六角结构，而在２．３４－４．１０ＧＰａ的合成压力范围内，它转变为赝正交结构；常压下Ｓｒ２ＳｉＯ４；Ｅｕ＾３＋，Ｂｉ＾３＋，为单斜结构，在４．２ＧＰａ的合成压力下，未发现其结     

Eu3+在SiO2气凝胶薄膜中的发光动力学过程

利用溶胶－凝胶法制得了Ｅｕ＾３＋掺杂ＳｉＯ２气凝胶薄膜,通过原子力显微镜对样品的形貌结构进行了观测,测量了样品的激发－发射光谱和时间分辨光谱,研究了Ｅｕ＾３＋的发光动力学过程,所得结构与实验值的拟合结果相一致。     

共沉淀包膜掺杂法制备氧化锌压敏陶瓷粉料条件的研究

本研究旨在建立以ＺｎＯ为主体，五元掺杂物共沉淀包膜法制备氧化锌压敏陶瓷用粉料的新方法。在实验测定Ｚｎ＾２＋及Ｂｉ＾３＋、Ｓｂ＾３＋、Ｃｏ＾２＋、Ｍｎ＾２＋、Ｃｒ＾３＋碳酸盐－氢氧化物沉淀溶解度曲线的基础上，研究各种因素对恒定ＺｎＯ及五元掺杂物组成ｍｏｌ％的影响，确定最佳共沉淀包膜条件。     

（Y,Zn,Sr）3（P,VO4）：Eu^3＋,Bi^3＋发光性质的研究

合成了组成为（Ｙ，Ｚｎ，Ｓｒ）３（Ｐ，ＶＯ４）：Ｅｕ＾３＋，Ｂｉ＾３＋的荧光材料，经Ｘ射线结构分析确定为Ｚｎ３（ＰＯ４）２结构，属于单斜晶系，空间群为Ｐ２１／ｎ。讨论了基质组成对Ｅｕ＾３＋离子发光性质的影响，用Ｙ＾３＋取代了一部分Ｚｎ＾２＋；用ＶＯ４取代了一部分ＰＯ４由于基质的４３６ｎｍ发射与Ｅｕ＾３＋的激发态能级的能量重叠，Ｅｕ＾３＋产生较强的５９８ｎｍ和６１８ｎｍ发射。另外，掺入少量Ｂｉ＾３＋     

碘化亚铜微晶掺杂硼硅酸盐玻璃的制备及其电致二阶非线性光学效应

采用可分相的Ｎａ２－Ａｌ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２系为基础玻璃，以ＣｕＯ／ＳｎＯ、ＮａＩ为原料，分别引入Ｃｕ＾＋、Ｉ＾－，成功地制备出ＣｕＩ微晶掺杂硼硅酸盐玻璃。通过Ｘ射线粉末衍射（ＸＲＤ）和高分辨透射电镜（ＨＲＴＥＭ）分析观察到了玻璃中的晶相及其分布；由玻璃的室温透射光谱研究了玻璃的热处理条件下光吸收性的关系。首次报道了该半导体微昌掺杂玻璃中的电致二次谱波发生，并讨论了该效应的机理。     

SiO2气凝胶薄膜中Eu3+离子的跃迁

利用溶胶－凝胶法制得了Ｅｕ＾２＋掺杂ＳｉＯ２气凝胶薄膜,并对其发光及跃迁性质进行了研究。使用原子力显微镜对样品的型貌结构做了观测、采用ＸＲＤ和ＩＯＲ对所得样品的结构进行了研究,测量了样品的激发一发光谱、吸收光谱和时间分辨光谱。通过Ｊｕｄｄ－Ｏｆｅｌｔ理论计算了Ｅｕ＾３＋的＾Ｄ０的辐射跃迁几率,并根据时间分辨光谱研究了＾５Ｄ１的无辐射跃迁几率及弛豫性质。虽然结果与掺Ｅｕ＾３＋的体硅玻璃没有很大差别,     

B3+,Zn2+掺杂与SiO2薄膜驻极体的改性

用粉体制备和高温熔凝工艺在ｎ〈１１１〉型单晶硅基片上制备了非晶态ＳｉＯ２－ＺｎＯ－Ｂ２Ｏ３复合膜驻极体。实现对ＳｉＯ２薄膜驻极体的改性,恒栅压电晕充电、等温表面电位衰减及热刺激放电（ｔｈｅｒｍａｌｌｙ ｓｔｉｍｕｌａｔｅｄ ｄｉｓｃｈａｒｇｅｄ,ＴＳＤ）实验表明,Ｂ＾３＋、Ｚｎ＾２＋的掺杂对ＳｉＯ２薄膜驻极体的电荷动态特性有较大影响：ＴＳＤ放电电流峰稳定于ｔ＝２３８℃处,峰位不随充电温度和充电电压     

BaFCl：Eu^2＋,Eu^3＋的光激励发光过程

本文首次报道了ＢａＦＣｌ：Ｅｕ＾２＋,Ｅｕ＾３＋的光激励发光。实验结果发现,在ＢａＦＣｌ：Ｅｕ中Ｅｕ＾３＋对Ｅｕ＾２＋的光激励发光有增强作用。在ＢａＦＣｌ：Ｅｕ的光致发射光谱中同时观察到对Ｅｕ＾２＋、Ｅｕ＾３＋及基质的本征发射,而光激励发射光谱中只观察到Ｅｕ＾２＋的发射,表明光致发光与光激励发光存在着很大的差异。这些结果表明,发光中心Ｅｕ＾２＋、Ｅｕ＾３＋及基质之间存在着相互作用和能量传递。本文提     

高温高压合成的硅酸锶铕铋的发光特性

用高温高压方法合成了Ｓｒ２ＳｉＯ４：Ｅ３＋ｕ，Ｂｉ３＋和ＳｒＳｉＯ３：Ｅｕ３＋，Ｂｉ３＋研究了合成压力对其发光性能的影响，与用溶胶－凝胶共沉淀法和常压高温法合成的产品作比较．常压制备的ＳｒＳｉＯ３：Ｅｕ３＋，Ｂｉ３＋为六角结构，而在２．３４—４．１０ＧＰＳ的合成压力范围内，它转变为反正交结构；常压下Ｓｒ２ＳｉＯ４：Ｅｕ３＋，Ｂｉ３＋为单斜结构，在４．２ＧＰａ的合成压力下，未发现其结构相变．高压合成产物的发光强度和相对量子发光效率降低，半宽度明显增加，且伴有红移发生．发光强度的改变是压致晶场的变化引起的     

氟化物中Eu^2＋,Ce^3＋的浓度猝灭及其机理

本文详细地研究了ＢａＹＦ５和ＫＣａＦ３基质中Ｅｕ＾２＋、Ｃｅ＾３＋浓度对其发光的影响，发现两基质中Ｅｕ＾２＋、Ｃｅ＾３＋的猝灭浓度都较低；提出了Ｅｕ＾２＋、Ｃｅ＾３＋的浓度猝灭机理，计算了猝灭浓度和临界距离，并与实验结果进行了比较。     

Optical characterization of Bi doped SrS nanophosphors

Optical properties of Bi³⁺ doped SrS nanophosphors synthesized by solid state diffusion method in the presence of sodium thiosulfate as a flux have been reported. UV-vis absorption and photoluminescence (PL) spectra of SrS phosphors doped with trivalent Bi³⁺ ions either alone or in combination with charge compensating ions, were also studied. These studies reflect that the incorporation of Bi³⁺ into host lattice is facilitated by the charge compensating Na⁺ ions. PL emission for SrS:Bi shows a peak at 481 nm at an excitation wavelength of 430 nm, which is attributed to the transition from the ³P₁ to ¹S₀ states of Bi³⁺. We have also investigated the effect of different dopant concentrations on PL emission intensity.     

Rapid synthesis and characterization of SrS:Eu,Sm infrared up-conversion materials

In this paper, SrS:Eu,Sm infrared up-conversion luminescent materials were successfully prepared by carbon assisted microwave sintering technology. X-ray diffraction and photoluminescence spectra were used to characterize the as-prepared SrS:Eu,Sm phosphors. The results indicated that the phosphors possessed the highest luminous efficiency when the microwave output power amounted to 750 W and the sintering time was 4 min. The SrS:Eu,Sm phosphors exhibited excellent luminescent properties under the ultraviolet and visible light. Upon the excitation of 276 nm ultraviolet light, five emission peaks centered at 379, 567, 589, 602 and 648 nm could be observed. The up-conversion response spectra ranged from 800 to 1600 nm, peaking at 1100 nm. The emission peak of up-conversion luminescence located at 599 nm.     

蓝光激发余辉型荧光粉的研究进展

白光LED具有节能、环保、响应速度快等优点,逐渐成为新一代照明光源,其普遍采用蓝光LED芯片激发黄色YAG∶Ce3+荧光粉合成白光的模式。由于这类LED加入直流(DC)/交流(AC)转换器和散热器,使得市售灯具价格偏高,严重阻碍了白光LED的进一步推广。AC-LED采用市电直接驱动,是LED发展的必然方向,余辉型荧光粉使得AC-LED变成了可能。主要针对应用于AC-LED的具有蓝光激发余辉功能的荧光粉的国内外研究现状进行了总结,并对用于消除LED频闪的余辉发生时间、余辉时间长度进行了计算,对余辉强度、余辉衰减速率进行了初步判断,得出荧光粉的余辉时间为6.67ms≤Tx≤10ms,余辉强度最小值需大于0.032mcd/m2,余辉衰减速率满足式(1),且余辉发生在T/2~2T/3时对于消除频闪最有益。     

Luminescence and afterglow in Sr2SiO4:Eu, RE [RE = Ce, Nd, Sm and Dy] phosphors—Role of co-dopants in search for afterglow

Luminescence of Eu²⁺ in Sr₂SiO₄:Eu²⁺, RE³⁺ [RE = Ce, Nd, Sm and Dy] phosphors was studied with a view to obtain an afterglow phosphor. The synthesized phosphors were characterized by powder X-ray diffraction (XRD), diffuse reflectance, photo- and thermoluminescence spectroscopic techniques. Afterglow was observed only with Dy³⁺ co-doped phosphor. The observed afterglow with Dy³⁺ co-doping originated from the formation of suitable traps which was supported by thermoluminescence results.     

蓄光型自发光材料及制品发展概况

论述了蓄光型自发光材料及制品的发展概况，对第一代和第二代蓄光型自发光材料的发展、典型代表材料及其特点、应用做了详细介绍，同时对蓄光型自发光材料的发展前景进行详细分析。     

Synthesis of Long Afterglow SrAl2O4: Eu2+, Dy3+ Phosphors Through Microwave Route

A novel and fast microwave route is used for the synthesis of SrAl₂O₄: Eu²⁺, Dy³⁺ powder phosphors. Based on the XRD peaks, the powder phosphors were identified as SrAl₂O₄ phase, which is monoclinic (a = 8.4424Å, b = 8.822 Å, c = 5.1607Å, = 93.415°). Compared with those synthesized by solid-state reaction process, the phosphors show a smaller grain size (about 4.8 m). It exhibited broadband peaks in both the excitation and emission spectra. A clear blue shift occurs in the excitation and emission spectra of these phosphors compared to those synthesized by solid-state reaction process. The excitation peaks lied between 300 nm and 450 nm, and the main emission peaks lied around 507 nm. The afterglow curve shows that the initial luminescent intensity of the phosphors synthesized through microwave route decreases greatly.     

Microwave synthesis and luminescence properties of YVO<Subscript>4</Subscript>:Eu<Superscript>3+</Superscript>

Europium-doped YVO₄ phosphors have been synthesized using microwave radiation of 700 W power. The uniformity and high rate of microwave heating, as well as “nonthermal” effects of microwave radiation, considerably accelerate the decomposition of precursors and YVO₄:Eu³⁺ synthesis. The europium concentration was varied from 1 to 8 at %. The luminescence intensity of YVO₄:Eu³⁺ was shown to depend on Eu³⁺ concentration, with a maximum at 8 at % Eu³⁺. According to transmission electron microscopy data, the synthesized phosphors consist of nanoparticles 6 to 8 nm in size, with an appreciable degree of agglomeration.     

Y2O2S:0.03Eu,0.03Ti的长余辉特性及Ti向Eu3+的余辉传能机制

采用高温还原法合成了Eu，Ti共激活橙红色Y2O2S长余辉发光材料，并测量了Y2O2S：0．03Eu,0．03Ti磷光体的荧光光谱，余辉分辨和余辉衰减曲线谱．实验结果表明，Y2O2S：0．03Eu,0．03Ti磷光体的发射谱由一系列Eu^3＋离子内部能级跃迁的尖峰组成；余辉分辨谱则不同，由一个主峰位于565nm的宽发射带和一系列波长范围位于500nm以上的窄发射带两种峰形组成，可分别归为Ti离子的宽带余辉发射和三价Eu^3＋的线状余辉发射,分析认为，样品中存在Ti余辉发射向Eu^3＋内部能级间产生选择性的余辉传能机制，从而导致Y2O2S：0．03Ti，0．03Eu磷光体中同时出现两种发光中心离子的余辉分辨谱现象．     

Cr<Superscript>3+</Superscript> activated Zn<Subscript>3</Subscript>Al<Subscript>2</Subscript>Ge<Subscript>3</Subscript>O<Subscript>12</Subscript>: a novel near-infrared long persistent phosphor

The near-infrared (NIR) long persistent phosphors have gained considerable attention owing to the potential applications in in vivo imaging. A novel NIR long-persistent phosphors Zn₃Al₂Ge₃O₁₂:Cr³⁺ was successfully synthesized by a high temperature solid-state reaction. The luminescent properties and the afterglow behaviors of the Zn₃Al₂Ge₃O₁₂:Cr³⁺ were investigated in detail. On the basis of thermoluminescence analyses, the mechanism of the persistent afterglow of the phosphors was also discussed briefly. The afterglow duration of this phosphor can last more than 12 h with the 650–750 nm emission range after stoppage of 254 nm ultraviolet light irradiation. Specifically, the persistent luminescence intensity and duration were regulated by changing Cr³⁺ doping concentration. All the results indicate that the Cr³⁺ activated Zn₃Al₂Ge₃O₁₂ has promising potential of practical applications.     

Luminescent properties of a reddish orange emitting long-lasting phosphor CaO:Pr

A novel reddish orange emitting long persistent phosphor CaO:Pr was prepared by a high temperature solid-state reaction method. All as-prepared phosphors were studied systematically by X-ray diffraction, photoluminescence (PL) spectra, decay curves, afterglow spectra and thermoluminescence (TL) glow curves. The intensity of PL and the performance of afterglow are dependent on the concentration of Pr³⁺ ions. The trap depth in the range between 0.5 and 0.7 eV is suitable for long afterglow (LAG). The optimal concentrations of Pr³⁺ ions for the best characteristic PL emission and afterglow were experimentally calculated to be 0.05 mol%. After irradiation by 273 nm for 3 min, the duration of reddish orange afterglow can last nearly 1 h. The decay processes and mechanism of LAG in CaO:Pr³⁺ were also discussed in detail.