Eu2+、Er3+共掺杂Sr3MgSi3O10高亮度蓝色荧光粉的制备及性质研究

采用凝胶-燃烧法在活性炭弱还原气氛下成功合成了高亮度蓝色发光材料Sr3 MgSi3 O10:Eu2+,Er3+.用X射线粉末衍射仪、荧光分光光度计对样品的物相结构和发光性质进行了分析和表征.结果表明,所合成的Sr3 MgSi3O10:Eu2+,Er3+的晶体结构与Sr2 MgSi2 O7的相似,属四方晶系.样品激发光谱是位于250 nm～450 nm的宽带,最大激发峰位于357 nm处;发射光谱也是一宽带,最强的发射峰位于466 nm处,属于Eu2+典型的4f65d1→4f7跃迁,呈蓝光发射.根据光谱测定结果和Van Uitert经验公式,推断Eu2+进入Sr3 MgSi3 O10基质后占据八配位Sr的格位.研究发现,共掺杂Er3+能有效敏化Sr3 MgSi3 O10基质中Eu2+的发光,当Er3+的掺杂摩尔分数为0.04时,样品发光强度最大,约为单掺Eu2+样品发光强度的3.3倍.     

Sr2MgSi2O7:Eu,Nd体系中Eu2+向Nd3+的能量传递

通过高温固相法合成了Sr2 MgSi2O7:Eu2+,Nd3+发光材料,测试了样品的物相结构、可见和近红外激发和发射光谱、荧光寿命等,研究了Eu2+对Nd3+的近红外发光性能的影响及近红外发光相对强度变化的规律,考察了煅烧温度、煅烧时间对近红外发光性能的影响.结果表明,1200℃下煅烧的St2 MgSi2O7:0.02Eu2+,0.01Nd3+样品近红外发光强度最强,Eu2+对Nd3+的近红外发光敏化效果最好.证实了在Sr2 MgSi2O7:Nd3+,Eu2体系中Eu2+通过无辐射传递的模式向Nd3+有效传递了能量.     

高亮度白光LED用YAG:Ce3+荧光粉的研制

根据蓝光芯片的发光特性,从激活剂、助熔剂、基质Y3+的替代物等方面较系统地研究了YAG:Ce3+荧光粉的制备.最终的荧光粉产品制成φ5mm封装20mA蓝光激发的白光LED后,光效可达70lm/W,显色指数≥80.     

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．     

复合熔盐法合成Y2O3.Eu3+红色荧光粉

以草酸钇铕(Y2(C2O4)3:Eu3+)为前驱体,采用复合熔盐(NaCl+S+Na2CO3)协助焙烧法合成Y2O3:E.u3+红色荧光粉.利用XRD、SEM、光谱分析等测试和分析荧光粉粒径、颗粒形貌以及发光性能.主要考察复合熔盐配比、用量以及焙烧温度和时间对Y2O3:Eu3+荧光粉发光性能的影响.结果表明,NaCl在...     

Investigation on luminescence properties of Ln^3＋ doped Sr3EuMgSi2O8 （Ln=Dy, Er, Ho）

The luminescent properties of Sr2.97MgSi2O8:Eu2+0.01 phosphors were investigated with different Ln3+0.02(Ln3+:Dy3+,Er3+,Ho3+) co-dopants. The co-dopants had no influence on both the structure of the lattice and the position of the emission peak. However, the afterglow properties of samples were enhanced with different co-dopants. The afterglow duration of the Dy3+ co-doped sample was longer than that of the others. Furthermore, the co-doping samples had stronger thermoluminescence (TL) intensity and therefore longer afterglow duration. At last, the self-reduction of Eu3+→Eu2+ was observed in an silicate compound of Sr3-xMgSi2O8:xEu phosphor in air condition. This is the first time to show a blue long afterglow phosphor synthesized avoiding reducing atmosphere.     

溶胶-凝胶法制备Ca3Al2O6：Eu3+红色荧光粉及其发光性能

采用溶胶-凝胶法合成Ca3Al2O6：Eu3+红色荧光粉,通过XRD、SEM、荧光光谱分别对样品的结构、形貌以及发光性能进行表征,讨论煅烧温度、Eu3+掺杂浓度以及电荷补偿剂对样品发光性能的影响.结果表明：实验所得样品的结构与Ca3Al2O6相同,Eu3+掺杂并没有改变其晶体结构.合成的荧光粉在394 nm近紫外光激发下发出615 nm明亮的红光.样品的红光强度随着煅烧温度的升高先增加后减弱,最佳烧结温度为1200℃.同样红光强度也随着Eu3+掺杂浓度的增加先增加后减弱,最佳Eu3+掺杂浓度为4%（摩尔分数）.加入电荷补偿剂后样品的发光强度均增强,其中加入K+后发光增强的效果最显著.该铝酸盐红色荧光粉性质稳定,在白光LED近紫外芯片激发中具有潜在的应用.     

蓝色荧光粉NaBa0.98PO4:Eu2+0.02的制备和发光性能研究

采用高温固相反应法合成了蓝色荧光粉NaBa0.98P04:Eu2+0.02.利用射线衍射(XRD)、扫描电镜(SEM)和荧光光谱等实验技术,研究了掺杂离子和掺杂浓度对荧光粉的晶体结构和发光性能的影响.结果表明:制备的粉末为单斜晶系NaBaP04,能被从紫外到蓝光波长范围的激发光有效激发,在波长360nm激发光激发下,发射光为波长在430nm左右的蓝光.同时,研究表明最佳掺杂离子为Ca2+,最佳掺杂浓度为7％ mol,荧光粉NaBa0.91Ca0.07PO4:Eu2+0.02的发光强度是NaBa0.98PO4:Eu2+0.02的1.68倍,该方法制备的荧光粉是一种很好的白光LED的蓝色荧光粉材料.     

细颗粒红色荧光粉Y2O3:Eu3+的结构和光谱性质研究

对草酸作为沉淀剂制备的细颗粒红色荧光粉Y2O3∶Eu3+进行结构和光谱性质研究,结果表明:其一次粒径为20nm～30nm,团聚尺寸D50=0.53μm,粉体细且分布均匀。该荧光粉最大激发峰位于252.2nm,最大发射峰位于612nm,荧光粉色品座标x=0.6479,y=0.3442,符合荧光粉要求。     

白光LED用YAG：Ce^3＋荧光粉的研究进展

介绍了近年来自光YAG：Ce^3＋荧光粉发光特性和合成方法,并展望该领域的发展前景及今后的研究趋势。     

Study on Luminescence Properties and Crystal-Lattice Environment of Eu~(2 ) in Sr_(4-x)Mg_x Si_3O_8Cl_4∶Eu~(2 ) Phosphor

ChlorosilicatecrystalmaterialM4 Si3O8Cl4 (M =Ba ,Sr ,Ca)isasuitablehostlatticeforluminescencematerials .Adivalenteuropiumactivatedstrontiumchlorosilicatephosphorisakindofgoodblue greenemissionphotoluminescencematerialunderUVexcita tion .Itsluminescencepropertiesandcrystalstructurehavebeenintensivelystudied[1～4 ] .Inthechlorosili catehost ,theluminescenceofEu2 consistsofa4f6 5d1- 4f7(8S7/2 )broad bandemission ,whichbe longstoelectric dipoleallowedtransitionandhasthepropertiesoflargeabso…     

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。     

Synthesis and Luminescence Properties of Ba2 MgSi2 O7 :Eu2+ under UV Excitation

Eu2 activated pyrosilicate phosphor were prepared under a reducing atmosphere by solid-state reaction.The crystal structure of Ba2 MgSi2 O7: Eu2 was analyzed by XRD method.The excitation spectrum of Ba2MgSi2 O7; Eu2 is composed of two broad bands centered at about 310 nm and 395 nm respectively.In the emission spectra, the peak wavelength is at about 507 nm under 380 nm UV excitation.It was found that the introduction of Zn2 into Ba2MgSi2O7: Eu2 Can effectively increase its emission intensity without changing the position of emission peak.And the Eu2 and Ce3 codoped pyrosilicate phosphor is the efficient bluish green phosphor under the excitation of long UV light and its emission intensity is stronger than Eu2 doped pyrosilicate phosphor.     

Eu~(2+) Luminescence in BaZnAl_(10)O_(17)∶ Eu Phosphor

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Luminescence Properties of Green-Emitting Phosphor (Ba1-x,Srx)2SiO4:Eu2+ for White LEDS

The (Ba1-xSrx)2SiO4∶Eu2 green-emitting phosphors were synthesized by conventional solid-state reaction in a CO-reductive atmosphere, and their luminescent properties were investigated. The XRD data show that the Ba/Sr ratio not only affects the lattice parameters, but also influences the emission peak. The excitation spectra indicate that this phosphor can be effectively excited by UV light from 370 to 470 nm. The emission band is due to the 4f65d1→4f7 transition of the Eu2 ion. With an increase in x, the emission band shifts to longer wavelength and the reason was discussed. The emission spectra exhibit a satisfactory green performance under different excitation wavelength(380, 398, 412, 420, 460 nm). (Ba1-xSrx)2SiO4∶Eu2 is a promising phosphor for green white-lighting-emission diode by ultraviolet chip.     

Synthesis and luminescence properties of bluish-green emitting K2MgSi3O8:Eu2+ phosphor

Eu2+-doped K2 Mg Si3O8 phosphors were synthesized by conventional solid-state reaction method. The phase formation of as-prepared samples was characterized by X-ray powder diffraction. The luminescence properties were investigated by the photoluminescence excitation and emission spectra, decay curve and CIE coordinates. The phosphor showed bluish-green emission centered at 460 nm under the excitation of UV and near UV light with the wavelength range of 250–430 nm. Two Eu2+ emission centers existed in the K2 Mg Si3O8:Eu2+ phosphor according to the luminescence spectra and the decay curves. The critical quenching concentration of Eu2+ doping was determined to be 3.0 mol.% and the concentration quenching mechanism was dipole-dipole interactions between Eu2+ ions. These results suggested that K2 Mg Si3O8:Eu2+ was a potential bluish-green phosphor candidate for white UV-LED.     

细颗粒红色荧光粉Y2O3:Eu3+的结构和光谱性质研究

对草酸作为沉淀剂制备的细颗粒红色荧光粉Y2O3Eu3+进行结构和光谱性质研究,结果表明其一次粒径为20nm～30nm,团聚尺寸D50=0.53μm, 粉体细且分布均匀.该荧光粉最大激发峰位于252.2nm,最大发射峰位于612nm,荧光粉色品座标x=0.6479,y=0.3442,符合荧光粉要求.