助熔剂对微波合成Y2O3:Eu3+红色荧光粉的影响

采用微波法合成Y2O3:Eu3+红色荧光粉,研究了碳酸盐、氟化物、硼酸等助熔剂对其合成过程及发光性能的影响.分别采用光谱分析仪和激光粒度仪对所合成荧光粉的光电性能和粒径进行分析.结果表明,不同助熔剂的加入对样品发射主峰的位置(610 nm)没有产生影响,但可明显影响样品的发光性能和粒径.采用碳酸盐单一助熔剂时,样品的相对亮度比采用氟化物时的高;采用复合助熔剂所制备样品在相对亮度及粒径方面,整体上较采用单一助熔剂样品的更优.     

SrS:Ce3+,K+荧光体的微波辐射合成法及对发光特性的影响

本文首次用微波辐射法（ＭｉｃｒｏｗａｖｅＲａｄｉａｔｉｏｎＭｅｔｈｏｄ，简称ＭＲＭ）合成了纯的ＳｒＳ基质和ＳｒＳ∶Ｃｅ３＋，Ｋ＋蓝色荧光化合物，用ＸＲＤ测定了它们的晶体结构，系统考察了不同浓度的Ｃｅ３＋离子对发光性能的影响。实验发现，微波辐射能使Ｃｅ３＋在ＳｒＳ基质晶格中均匀扩散，并能提高激活剂的掺入量，阻止Ｃｅ３＋离子的簇集，延缓Ｃｅ３＋离子对的形成，从而能得到晶相纯、粒度均匀和发光效率高的ＳｒＳ∶Ｃｅ３＋，Ｋ＋蓝色荧光体。     

微波场作用下La2O2S:Tb绿色荧光粉的快速合成及其发光特性

采用微波法快速合成了La2O2STb绿色荧光粉.用X射线粉末衍射(XRD)、扫描电镜(SEM)、荧光分光光度计等对合成产物的结构、形貌以及发光特性进行了研究.结果表明,材料的晶体结构为六方晶系,与La2O2S的相同.颗粒的形貌多为六边形,分散性很好,尺寸在2μm左右.发射光谱由498nm、547nm、590nm、624nm等一系列窄带发射峰组成,归属于Tb3+从5D4到7FJ(J = 0～6)的跃迁.主发射峰位于547nm,对应于5D4→7F5的能级跃迁,导致一种绿光发射.研究发现Tb的掺杂浓度对样品主发射峰的发光强度有着很重要的影响,在7%(摩尔分数)时达到最大,继续增加Tb的浓度,发光强度反而降低.     

蓝色发光材料Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+)的微波合成及性能

采用微波辐射法合成了Sr2MgSi2O7∶Eu2+,Dy3+粉末,研究了微波辐射功率和加热时间对制备Sr2Mg-Si2O7∶Eu2+,Dy3+的影响,确定了微波法合成Sr2MgSi2O7∶Eu2+,Dy3+的最佳条件,并用x射线衍射(XRD)、荧光光谱等测试手段对其进行了表征。XRD结果表明,合成的Sr2MgSi2O7∶Eu2+,Dy3+属于四方晶系。荧光光谱测试表明,用lem=467nm作为监控波长,在200nm~450nm之间有宽的激发光谱,峰值位于398nm。用lex=398nm激发样品,其发射光谱为一宽带,峰值位于467nm。Sr2MgSi2O7∶Eu2+,Dy3+的荧光强度和余辉性能随辐射功率和时间的不同而发生变化,其中以辐射功率720W,反应时间25min时荧光强度最强,余辉时间可达8h。     

InBO3:Tb3+荧光粉的合成及其发光性质

硼酸盐体系绿色荧光粉具有发光效率高、光色纯、烧结温度低、合成简便、粒径适中等优点,广泛用于等离子彩色电视机.应用高温固相反应法合成In0.98Tb0.02BO3荧光粉,并研究其中Tb3 的光谱性质及能量传递现象.发现激发光谱中Tb3 在274nm处有一最强4f→5d激发峰,能有效地吸收能量.发射光谱在550nm处有一最强峰,属于Tb3 的5D4→7F的跃迁,发绿光.发射峰高而窄,说明荧光粉In0.98Tb0.02BO3发光强度高,且只有一个峰,说明发光颜色纯,有一定的开发价值.还研究了几种因素对In0.98Tb0.02BO3荧光粉相对亮度的影响并得出了合成In0.98Tb0.02BO3荧光粉的最佳实验条件: 焙烧温度1300℃,焙烧时间4h.     

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。     

稀土2-噻吩甲酸系列配合物的合成及其Eu3+的发光

合成了6种稀土2-噻吩甲酸(L)配合物.通过元素分析、摩尔电导及差热-热重分析确定其化学组成为REL3·2H2O(RE= Y,La,Pr,Nd,Sm,Eu;L=C4H3SCOOH),测定了配体及配合物的红外光谱、紫外光谱及铕配合物荧光激发和发射光谱.红外光谱测定表明,配体通过羧基以鏊合双齿的方式与稀土离子(Ⅲ)配位成键.荧光光谱数据表明, 铕配合物具有良好的荧光性能.     

微波场作用下白光LED用绿色荧光粉Ca3Sc2Si3O12∶Ce的快速合成及其发光特性

采用微波法快速合成了Ca3Sc2Si3O12∶Ce绿色荧光粉。用X射线粉末衍射(XRD)、扫描电镜(SEM)、荧光分光光度计等对合成产物的结构、形貌、以及发光特性进行了研究。结果表明:材料的晶体结构与Ca3Sc2Si3O12的相同,属于立方晶系,具有Ia3d空间群。颗粒的形貌为类球形,分散性很好,尺寸小于1μm。激发光谱为一位于400～500 nm的宽带,可与蓝光LED芯片匹配使用。发射光谱也呈现为一宽带,发射主峰位于505 nm,该宽峰对应于Ce3+离子的5d-2F5/2及5d-2F7/2能级跃迁。研究发现Ce的掺杂浓度对样品主发射峰的发光强度有着很重要的影响,Ca3-xSc2Si3O12∶Cex荧光粉的最佳掺杂浓度为x=0.10时达到最大,继续增加Ce的浓度发光强度反而降低。     

Microwave Radiation Synthesis Method of CaS:Eu2+, Sm3+ and Studies of Their IR Up-Conversion Properties

IR up-conversion material CaS: Eu2 , Sm3 was synthesized by microwave radiation method (MRM). The effect of the different concentrations of Eu2 ion and Sm3 ion on properties of the up-conversion material CaS: Eu2 ,Sm3 was discussed. The crystal structure was determined by XRD. The experimental results show that the MRM compared to the traditional high temperature solid reaction method exhibits interesting features.     

Preparation and Characteristics of Optical Storage Material CaS:Ce3+, Sm3+

CaS: Ce3+, Sm3 + optical storage material was prepared by wet-method under the reducing atmosphere. Influence of sintering atmosphere on luminescence intensity was studied to get the result that active-carbon reducing atmosphere is better. XRD analysis shows that CaS crystal structure was formed at 700 ℃. The excitation spectrum is in the range of 250 ～ 500 nm with peaks at 260.2, 353.4 and 461.2 nm, the fluorescence spectrum shows a broadband spectrum with peaks at 503, 568 and 604 nm and the emission spectrum of the sample stimulated by 980 nm laser also shows a broadband spectrum with peaks at 508,565 and 600 nm. The result of spectra analysis indicates that this material can absorb and "trap" incoming light energy from ultraviolet and visible light (Information write-in), and release that stored energy in the form of green luminescence (information read-out) upon stimulation from a longer IR wavelength. The optical storage physical mechanism was also discussed.     

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.     

掺杂 Eu3+ 的 Na24P2Mo22O83 的合成及其发光特性

采用固相反应法合成了掺杂Eu3 的新型杂多酸盐Na2 4 P2 Mo2 2 O83 荧光体 ,并通过元素分析、红外光谱、X射线粉末衍射对其组成及结构进行了表征 ,新型杂多酸盐Na2 4 P2 Mo2 2 O83 属正交晶系 ,晶胞参数a =1 4774nm ,b =1 1896nm ,c=1 10 42nm ,属D2 4 -P2 12 12 1(No.19)空间群。测定了其激发光谱和发射光谱 ,探讨了掺杂Eu3 离子的Na2 4 P2 Mo2 2 O83 的发光特性。     

Low Temperature Luminescence Properties of Tm3+ Doped Aluminate Phosphor

(Ba0.66Sr0.33)Mg0.8Al11.47O19:Tm0.013 (BSMA:Tm3 ) phosphor was synthesized by solid-state reactions. The sample was characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), vacuum ultraviolet (VUV) spectra, ultraviolet (UV) spectra and FT-IR spectrum. XRD pattern reveals that BSMA:Tm3 has the same structure as BaAl12O19 phase. SEM image illustrates that the phosphor has the hexagonal shape and deep slice structure. VUV and UV emission spectra at 20, 50 and 100 K show that the low temperature luminescence intensities become weak gradually with the increasing of the temperature under 147 and 254 nm excitation. The strong broadband peaks at around 357 and 397 nm and the peak at 516 nm under 147 nm excitation all correspond to the characteristic transitions of Tm3 ions. However, under UV (254 nm) excitation, the main peak becomes 530 nm which has very high line intensity, and the peaks at about 362 and 403 nm are very weak. The excitation spectrum at 20 K shows that there are three absorption peaks at around 153, 186 and 193 nm when 516 nm emission is monitored. The absorption peaks of [AlO4], [AlO6] and Al-O can be observed in FT-IR spectrum.     

Synthesis and photoluminescence properties of novel red-emitting Ca14Mg2(SiO4)8:Eu3+/Sm3+ phosphors

Novel red-emitting Eu3+, Sm3+ singly doped and co-doped Ca14Mg2(SiO4)8 phosphors were prepared by conventional solid- state reaction. Powder X-ray diffraction patterns were employed to confirm phase pu...     

九配位Sm3+,Eu3+和Gd3+与EDTA配合物的合成及结构研究

详细报道了Sm3+,Eu3+和Gd3+分别与乙二胺四乙酸(EDTA)配体形成配合物的合成及结构测定.通过单晶X-射线衍射仪和元素分析的测定,确定了这些配合物的结构都是以Sm3+,Eu3+和Gd3+为中心的九配位单帽四方反棱柱体结构,组成分别为Na[Sm(EDTA)(H2O)3]·5H2O,Na[Eu(EDTA)(H2O)3]·4H2O和Na[Gd(EDTA)(H2O)3]·5H2O.