Preparation and Long Persistence Red Luminescence of M0.2Ca0.8TiO3∶Pr3+(M=Mg2+,Sr2+,Ba2+,Zn2+)

M0.2Ca0.8TiO3∶Pr3 (M=Mg2 , Sr2 , Ba2 , Zn2 ) long persistence red phosphors were prepared by solid state reaction. The influence of the partially replacing Ca2 in CaTiO3 with Mg2 , Sr2 , Ba2 , Zn2 on the excitation spectra, the emission spectra and the long persistence properties were studied. The results suggest that certain quantity of Mg2 , Sr2 , Ba2 , Zn2 which partially replace Ca2 can enhance the luminescent intensity and prolong the afterglow persistence of the samples. The intensity of Mg0.2Ca0.8TiO3∶Pr3 is above all of the samples. Take Mg0.2Ca0.8TiO3∶Pr3 as the basic sample, the influence of Pr3 concentrations(C(Pr3 )) on the long afterglow properties were also studied. The results suggest that when the C(Pr3 ) is 0.10%(mol fraction) the intensity of the sample is the highest. The excitation spectra of all these samples show broad band spectra ranging from 300～500 nm peaking at about 342 nm. The emission spectra also exhibit a broad band peaking at 613 nm(CaTiO3∶Pr3 is 612 nm). XRD research indicates that the crystalline phases change due to the replacement of divalent metal ions.The research on the thermoluminescence spectra of Mg0.2Ca0.8TiO3∶Pr3 indicates that the peak is at 107.35 ℃ and the depth of the trap energy is about 0.852 eV.     

基于DOPPP的高效白光OLED器件

采用真空热蒸镀的方法,以荧光染料1-(2,5-d imethoxy-4-(1-pyrenyl)-phenyl)pyrene (DOPPP)为蓝发光 层,5,6,11,2-Tetraphenylnaphthacene (Rubrene)为黄发光层,制备了结构为ITO/m-M TDATA(10nm)/NPB(30nm)/ Rubrene (0.2nm)/ DOPPP (x nm)/TAZ(10nm)/Alq₃(30nm)/LiF(0.5nm)/Al的双发光层的高效白色有机电 致发光器件(OLED)。通过调整DOPPP层的厚度,研究器件的发光性能。当DOPPP层厚小 于25nm时,器件以 黄光发射为主;当DOPPP层厚为25nm时器件的性能最佳,在电流密度为209.18mA/cm²时,获得最 大亮度为9232cd/m²,在电流密度为103.712mA/cm²时获得最大电流效率4.68cd/A, 并随着驱动电压 的升高,器件的色坐标从(0.366,0.365)变化到(0.384,0.399),都在白光的范围之内;当DOPPP层厚度超过25nm时,器件的效率和亮度 都开始下降。     

SrS:Eu,Sm的制备与光谱性能

采用高温固相法制备了SrS:Eu,Sm光激励发光材料.研究了稀土掺杂量对样品光激励发光性能的影响.XRD分析表明,在1000℃灼烧1 h的样品为SrS面心立方结构,晶格常数α=0.6020 nm;激发光谱表明,样品在紫外和可见光均有较强激发峰;样品的荧光发射光谱由3个发射峰组成,其主峰位于602.1 nm.红外光激励发射光谱是峰值位于602 nm附近的宽带谱,样品的光激励激发光谱是峰值位于1046 nm宽带谱,带宽在800～1400 nm.最佳稀土掺杂量为0.15%.     

沉积法制备CaS∶Eu2+,Sm3+红外上转换荧光屏工艺的研究

以固相法制备的上转换荧光粉CaS∶Eu2+,Sm3+为原料制备荧光屏,对电解质的种类及用量、水玻璃的用量、沉积厚度对荧光屏性能的影响进行了研究.研究结果表明:采用硝酸钡为电解质时,荧光屏表面平整;当水∶粉体∶水玻璃∶电解质=100∶0.03∶2.88∶0.027(质量比),退火温度为400℃时,得到的荧光屏表面平整,不存在褶皱,粉体与玻璃基片粘结效果佳;沉积厚度为0.0163 g/mm2时,荧光屏的发光性能达到最佳.     

Preparation of CaS:Eu2+, Sm3+ by Solid Reaction Method and Its Photostimulated Luminescence

The CaS:Eu2 , Sm3 powders were prepared by high-temperature solid method in a reducing atmosphere. The influences of temperature and fired-time on properties of samples were studied. XRD analysis shows that crystal structure of CaS has formed at 700 ℃. Spectrum analysis results show that the samples which were stimulated by 980 nm laser after excited by ultraviolet lamp emit red luminescence peaking at 649 nm.     

CaS：Eu，Sm的微波合成与发光性能研究

采用微波合成法快速合成了红外光激励发光材料CaS：Eu，Sm。研究了输出功率对样品发光性能的影响，Eu，Sm双掺杂离子的不同掺杂浓度对发光性能的影响（确定了最佳掺杂浓度），不同助熔剂对发光性能的影响。XRD测试结果表明，CaS：Eu，Sm样品为面心立方结构；SEM照片显示样品粒径在400～500nm范围内；光谱分析表明，样品的红外光激励发光响应范围位于800-1600nm，上转换发光峰值位于655nm，对应于Eu^2＋离子4f^65d→4f^7（^8S7/2）跃迁。     

Yb3+和Er3+双掺氟氧玻璃的制备与荧光特性的研究

为了提高上转换玻璃在蓝绿波段的发光效率，以期望实现蓝绿波段的短波长激光器．以45PbF2 45GeO2 10WO3为基质组份，双掺Yb^3 和Er^3 稀土离子．采用熔融技术，退火温度为380℃，恒温4h以上．制得样品。用V-棱镜测得基质折射率为1．517．样品折射率为1．65。同时利用紫外-可见-红外光谱仪在0．35～2．5μm的波长范围内测试得到样品的透过率，发现基质玻璃在可见与近红外的透过率大于73％．而掺入Er^3 /Yb^3 的上转换玻璃透过率大于50％，并且有稀土离子的特征吸收峰。用日本生产的Hitachi F-4500荧光光度计．激发波长为980nm．观测激发光谱，样品在545nm处有一较强的发光峰，在650nm处有一个相对弱的发光峰。     

Li2B4O7微晶玻璃的制备及其检测放射线的性能

阐述了Ｌｉ２Ｂ４Ｏ７微晶玻璃的制备及其热激外电子发射（ＴＳＥＥ）特性，并研究了Ｌｉ２Ｂ４Ｏ７微晶玻璃在ＬｉＦ单晶表面上的薄膜及其ＴＳＥＥ特性。结果表明，Ｂ２Ｏ３－Ｌｉ２Ｏ－ＳｉＯ２系统玻璃经热处理后可在一定范围内获得微晶玻璃，微晶化程度直接影响材料的ＴＳＥＥ特性。射线强度不同，微晶玻璃的ＴＳＥＥ曲线不同。这表明，可以利用这种微晶玻璃检测射线强度。不同种类的射线照射Ｌｉ２Ｂ４Ｏ７微晶玻璃在ＬｉＦ单晶     

SrAl2O4：Eu^2＋，Dy^3＋长余辉光致发光材料的固相反应法合成与特性

采用高温固相反应法，在还原气氛下制备了掺稀土离子Eu^2 和Dy^3 的铝酸锶长余辉光致发光材料。XRD研究表明，所制备的铝酸盐具备SrAl2O4的晶体结构。SrAl2O4：Eu^2 ，Dy^3 发光材料的发光光谱是中心位于520nm的带状谱，激发峰波长范围位于300nm～500nm，发光余辉可持续12h以上。研究了SrAl2O4：Eu^2 ，Dy^3 发光材料的耐温性和耐水性，结果表明，随热处理温度升高，发光亮度下降；水浸使发光材料与水反应生成水化物，使发光性能下降。     

Optimization of synthesis of upconversion luminescence material NaYF4：Er^3＋,yb^3＋ nanometer-phosphor by low-temperature combustion synthesis method

A kind of Er3+-Yb3+ co-doped natrium yttrium fluoride nanometer-phosphor sensitive to 980 nm was synthesized by the low-temperature combustion synthesis method, which expanded the application range of the low-temperature combustion synthesis (LCS) method which is always used in the synthesis of oxides and compound oxides. The synthesis conditions were optimized with orthogonal experiments and the optimum technological parameters were obtained. Intense upconversion emissions at 522, 540 and 653 nm corresponding to the 2H11/2, 4S3/2, and 4F9/2 transitions to the 4I15/2 ground state were observed when excited by continuous wavelength (CW) laser radiation at 980 nm. The effect of the carbamide amount on the phase formation and the luminescence intensity was analyzed. The average particle size of the sample was 30-40 nm.