Crystal Structure and Luminescence Spectra of Novel Coordination Layer of {[Eu(m-BDC)(NO_3)(Phen)(H_2O)]_2·2CH_3CH_2OH}_n

Coordinationpolymersareofgrowinginterestin viewoftheirpotentialapplicationincatalysis,mo lecularrecognition,sensors,storagedevicesandso on[1～3].Asamultifunctionalligand,benzenedicar boxylicacid(H2BDC)hasbeenextensivelyusedin thesynthesisofcoordinationp…     

EGDP/腈混纺针织绒工艺探讨

介绍了ECDP纤维的主要性能,ECDP/腈混纺针织绒的纺纱工艺,对生产过程中出现的困难,提出了解决办法.     

SiO2凝胶玻璃中Eu^＋,Tb^3＋与1,10—邻菲罗啉配合物的原位化学？…

应用原位化学复合方法，将Ｅｕ＾３＋、Ｔｂ＾３＋与，１，１０－邻菲罗啉配合光学均匀复合到ＳｉＯ２凝胶玻璃中，解决了国稀土含氮配合物易水解而难以用溶胶－凝胶工艺将其均匀掺入无机基质的问题。研究了原位配合物的荧光和热学性能。结果表明，由于配合物的形成使稀土离子特征荧光强度显著增加，而无机基质的保护作用则使原位配合物热稳性提高２００℃以上。化学合成纯配合物Ｅｕ（Ｐｈｅｎ）２Ｃｌ３·２Ｈ２Ｏ的高分辨荧光谱表     

MOCVD生长的GaN 薄膜中缺陷团引起的X射线漫散射研究

采用高分辨X射线衍射对在蓝宝石(0001)面生长的GaN外延膜的漫散射进行了研究.结果表明,GaN薄膜中存在缺陷团,其浓度随着穿透位错密度的增加而增加,其平均半径呈相反趋势.基于位错是点缺陷的聚集区,缺陷团优先在位错附近形成的效应对结果进行了解释.同时发现电子迁移率随缺陷团浓度的增加而减少.     

MOCVD生长的GaN薄膜中缺陷团引起的X射线漫散射研究

采用高分辨X射线衍射对在蓝宝石(0001)面生长的GaN外延膜的漫散射进行了研究.结果表明,GaN薄膜中存在缺陷团,其浓度随着穿透位错密度的增加而增加,其平均半径呈相反趋势.基于位错是点缺陷的聚集区,缺陷团优先在位错附近形成的效应对结果进行了解释.同时发现电子迁移率随缺陷团浓度的增加而减少.     

不同方法制备的C60材料的发光行为

采用Sol-Gel溶胶—凝胶的方法制备出了掺杂C     

Er3+掺杂的 MFT玻璃材料2H11/2、4S3/2→4I15/2荧光性质

计算了Er     

稀磁半导体Zn_（1－x）Mn_xSe外延薄膜与超晶格的光学特性研究

用分子束外延生长了不同组分ｘ的Ｚｎ１－ｘＭｎｘＳｅ外延膜和Ｚｎ１－ｘＭｎｘＳｅ／ＺｎＳｅ超晶格．由于Ｚｎ１－ｘＭｎｘＳｅ的能隙Ｅｇ随组分变化在低组分区形成弓形，且弓形的范围随温度变化的反常特性，首次在光致发光谱（ＰＬ）中观测到当温度升高时，Ｚｎ１－ｘＭｎｘＳｅ／Ｚｎｓｅ超晶格中由ＺｎＳｅ为阱、Ｚｎ１－ｘＳｅ为垒转换成Ｚｎ１－ｘＳｅ为阱，ＺｎＳｅ为垒．瞬态光致发光结果表明，Ｚｎ１－ｘＭｎｘＳｅ／ＺｎＳｅ超晶格中Ｍｎ＋＋离子的激发态弛豫时间远大于Ｚｎ１＝ｘＭｎｘＳｅ外延模中Ｍｎ＋＋离子的弛豫时间，这可能是由于     

Study on UV Excitation Properties of Eu^3＋ at S6 Site in Bulk and Nanocrystalline Cubic Y2O3

Increases of emission intensities for Eu^3 at the S6 site relative to that at the C2 site were observed as UV excitation wavelength decreases from 300 nm to 200 nm in both bulk and nanocrystalline cubic Y2O3:Eu^3 . Decomposition of excitation spectra shows that the charge transfer band of Eu^3 at the S6 site lies in the high-energy side of that at the C2 site, resulting in that the energy transfer from the host prefers to the S6 site. Detailed emission and excitation spectral characteristics were analyzed and discussed. In addition, spectral red-shift were found in both charge transfer bands in nanocrystalline Y2O3: Eu^3 compared to the bulk material. The number ratio of S6 sites to C2 sites is also smaller in nanocrystalline Y2O3:Eu^3 than that in the bulk one.     

Preparation and Luminescent Characteristics of LaPO_4∶Eu Nanoparticles and Nanowires

Itiswellknownthatreductionofparticlesizeofcrystallinesystemcanresultinremarkablemodifica tionoftheirpropertieswhicharedifferentfromthoseofbulkbecauseofhighsurfacetovolumeratioandquan tumconfinementeffectofnanometermaterials .In1994 ,Bhargavaetal .reportedthatradiativetransi tionrateofMn2 ionsinZnSnanocrystalincreasedsixorderincomparisonwithbulkone[1] .Despitethisre sultwasstronglycriticizedlater ,studiesonnanosizedluminescentsemiconductorattractedgreatinter ests[2～ 4 ] .Sincecompoundsofra…