Eu~(3+)掺杂浓度对Gd_(6-x)WO_(12)∶xEu~(3+)红色荧光粉发光特性的影响

采用高温固相法制备了Gd_(6-x)WO_(12)∶xEu~(3+)(x=0. 05,0. 1,0. 2,0. 3,0. 4,0. 5)红色荧光粉,并对此荧光粉的结构及发光性能进行了探讨。结果表明,其激发光谱分布在350～550 nm波长范围,较强谱峰位于395 nm、465 nm,可以被In Ga N管芯产生的360～480 nm辐射有效激发;在波长为395 nm近紫外光或者465 nm蓝光激发下,其发射光谱谱峰位于613 nm处。随着掺杂离子Eu~(3+)浓度x的增大,荧光粉荧光强度会随之增强,当强度达到最高时,Eu~(3+)掺杂浓度为x=0. 3,随着掺杂浓度x的进一步增大,强度逐渐降低,发生浓度猝灭。根据Dexter能量共振理论,其自身的浓度猝灭是由电偶极-电偶极相互作用引起的。     

钨酸锂铕荧光粉的制备及封装性能研究

文章简单介绍了钨酸锂铕（LiEuW2O8）荧光粉的制备方法,分析了该荧光粉的激发光谱、发射光谱的测试结果。该荧光粉具有较宽的激发光谱,适合与近紫外、蓝光以及绿光芯片配合使用。其发射光谱主峰位于615nm,色坐标位于（x=0．666,y=0．331）左右,具有较高的色纯度。通过分别对钨酸锂铕荧光粉及硫化物荧光粉进行封装,发现该荧光粉能有效降低色温,且对光效影响较小,适于低色温白光LED封装。     

高温固相法制备红色荧光粉Ca_(1-x)WO_4:xEu~(3+)及其发光性能研究

采用高温固相法合成了红色荧光粉Ca_(1-x)WO_4:xEu~(3+)(x=0.02~0.40)。运用X射线衍射仪(XRD),扫描电子显微镜(SEM)以及荧光光谱仪(PL)等对所得材料的结构、形貌以及光学性能进行了表征。结果表明,由于在基体Ca WO_4中,Eu~(3+)取代Ca2+成为发光中心,红色荧光粉Ca WO_4:Eu~(3+)的发光强度随着Eu~(3+)浓度的增加而增加,当x=0.25时,强度达最大值。     

Ca（Eu1-xLax）4Si3O13红色荧光粉的研究及其在三基色白光LED上的应用

研发了更适合应用于三基色白光LED的Ca(Eu1-xLax)4Si3O13红色荧光粉,它在395nm峰值的近紫外光的激励下能放射出峰值为613nm的红色光.当x=0.5时,此红色荧光粉的转换效率能达到最大值0.14.用外部量子效率为0.40的近紫外LED与Ca(Eu1-xLax)4Si3O13红色荧光粉和绿色、蓝色荧光粉共同组合的三基色白光LED,白光的光效和平均显色指数分别达到了21.61m/W和83.9.     

(Sr,Ca)AlSiN_3:Eu~(2+)荧光粉的常压合成及其LED封装性能研究

通过常压合成工艺成功制备了一系列高亮度的(Sr,Ca)AlSiN_3:Eu~(2+) 氮化物荧光粉,比较了常压合成和高压合成工艺对荧光粉晶体结构、光谱特性和晶体形貌的影响。荧光光谱分析表明,常压合成工艺制备的(Sr,Ca)AlSiN_3:Eu~(2+)荧光材料表现出优异的荧光强度,其发射波长位于615 nm~640 nm的红光范围,实现了一定范围内的光谱调控。X射线衍射结果表明,该氮化物红色荧光材料具有正交晶系的CaAlSiN_3晶体结构,且产物中不存在杂质相。峰值波长位于615 nm和625 nm的样品能够作为光谱中的有效红色组成部分用以制备高显色性的白光LED光源。通过LED封装的优化实验,所获得的白光LED光源具有86.8 lm/W的流明效率,并具有良好的显色指数(Ra=85)。进而,通过改变氮化物红粉的组成和比例能够制备具有不同色温(4 000 K~6 000 K)的白光LED光源。     

双色荧光粉封装3014器件的光谱耦合特性及其性能

以Lu_(2.54)Y_(0.4)Al_5O_(12):0.06Ce绿色荧光粉和Sr_(0.65)Ca_(0.35)AlSiN_3:0.05Eu红色荧光粉为研究源,通过研究不同质量比的双色荧光粉封装的3014器件的发光光谱及其光效、色坐标、色温和显色指数,得出双色荧光粉封装3014器件的光谱耦合规律为:每组质量比封装的3014器件的色坐标在CIE图上的落点分布情况均可描绘出一条曲线,其与黑体辐射线有唯一的交点即为该3014器件对应的色温。封装的3014器件的显色指数均大于80,光效大于100 lm/W,满足市场需求。     

高显色荧光粉的新型体系

0　前言荧光灯显色性的改善主要取决于所用荧光粉材料。紧凑型荧光灯由于采用稀土激活的三基色荧光粉,其显色指数达到80以上。尽管显色性可以得到改善,但荧光粉的价格太高,难以在普通荧光灯中大量推广。卤粉价格便宜,但发射光谱缺乏长波段的宽带红光,显色性较差。为弥补荧光灯中红色调的不足,我们做了一系列实验,研制了(La,Ce)(Mg,Mn)B5O10铈锰共激活的硼酸盐红粉,外观白色,粉末比重为4.3,在253.7nm紫外线激发下主峰波长为624nm,半宽度80nm,色坐标X=0.6546,Y=0.3451,是一种较经济、较理想的发红色宽带荧光的荧光粉。为改善卤粉的显色性,…     

YAG荧光粉在白光LED封装中的应用

采用蓝光芯片涂敷黄色钇铝石榴石(Yttrium Aluminum Garnet,YAG)荧光粉封装制成白光LED,详细讨论了荧光粉的主波长对白光LED色坐标的影响,同时考察荧光粉涂敷浓度对光效、显色指数的影响。结果表明,随着荧光粉涂敷浓度的增加,制得的白光LED的色坐标x和y可以回归成1条直线,主波长越短的荧光粉其回归直线斜率越大,回归直线相交于蓝光芯片的色坐标点;白光LED的光效和显色指数均随荧光粉涂敷浓度的增加先增加再减少。     

低色温高显色性白光LED制备及其性能的研究

通过在YAG黄色荧光粉中掺杂两种红色荧光粉进行白光LED封装测试,研究了这两种红粉对白光LED色温和显色性的影响,实验表明,调整YAG荧光粉与两种红色荧光粉的配比,能够制造出低色温、高显色性的白光LED。     

白光LED用荧光粉相关专利简介

1 一种白光LED用钒酸盐基质荧光粉及其制备 方法 公开(公告)号:CN102618270A 摘要:本发明公开了一种白光LED用钒酸盐基质荧光粉及其制备方法,该工艺采用高温固相法制备M2V2O7:Eu3+单一基质荧光粉,并采用二次煅烧的方法改善荧光粉结晶性能,提高发光强度.所用原料为Al2O3(99.9％),MCO3(99.9％,M=Ca,Sr,Ba),V2O5 (99.9％)、Eu2O3,同时还加入N2CO3 (N:Li,Na,K)作为电荷补偿剂,所得产物在500nm和600～ 630nm有发射峰,分别归属于VO43-和Eu3+的发射,两发射峰复合发射白光,最佳色坐标为(0.324,0.317),非常接近于正白点(0.330,0.330).本发明制备方法工艺简单,合成反应温度低,所Sr2V2O7:Eu3+荧光粉的色坐标可以通过调节Eu3+的掺杂浓度来调整,发光效率高,热稳定性好,具有应用于紫外激发的白光LED的前景.     

R2MgSi2O7：Eu（R=Ca，Sr,Ba）荧光粉发光性能及应用

采用高温固相法制备R2MgSi2O7：Eu（R=Ca,Sr,Ba）荧光粉,并对其发光性能及封装应用进行研究。详细讨论碱土元素的种类及锶／钙的比例对激发与发射光谱的影响,同时考察激活剂Eu^2＋浓度对发光强度的影响,也考察了将Ba2MgSi2O7：Eu0.005荧光粉封装于紫光芯片中的发光特性。结果表明,荧光粉基质中碱土元素的种类及碱土元素锶钙的含量对其发射及激发光谱有较大影响,随着碱土离子Ca。’含量的增加,发射光谱逐渐红移,发光强度逐渐减弱。本文对这一变化机理进行了初步分析。当激活剂Eu^2＋摩尔浓度为0．005时,荧光粉具有较好的发光强度,并且当荧光粉的质量浓度达到19％时,LED具有较好的光效。     

白光LED用几种Eu^2＋激活的红色荧光体的性能

本文对固态照明白光LED用Eu^2＋激活硫化钙、Eu^2＋激活的氮化物和氮氧化物三种高效红色荧光体的物理化学和发光特性进行对比和分析。氮（氧）化物红色荧光体的性能稳定。四种材料适合用作InGaN蓝光LED光转换红色荧光体,和YAG：Ce黄粉组合,使制作的白光LED的显色指数Ra大大提高,有利实现LED普通照明。     

白光LED用Li2+y(Gd1-xEux)4（MoO4）7-y（BO3）y新型红色荧光体

首次报道了采用高温固相反应合成Li2+y(Gd1-xEux)4(MoO4)7-y(BO3)y(0相似文献   

Photoluminescence properties of Y2O3co-doped with Eu and Bi compounds as red-emitting phosphor for white LED

Bismuth doped Y₂O₃: Eu was used as a red phosphor with a very high efficiency and an appropriate emission wavelength of around 310–400 nm. This red phosphor was synthesized by the solid state reaction which is normally used in the field of white LEDs. In this study, we synthesized Y₂O₃: Eu, Bi phosphors using a solid state reaction. We investigated the effect of the Eu^{3 +} and Bi^{3 +} concentrations and additive fluxes on the emission characteristics. The fabricated phosphors were investigated by analyzing their particle size and crystal structure with scanning electron microscopy and X-ray diffraction (XRD). Their photoluminescence (PL) spectra were also measured at room temperature.     

Characteristics of ZnGa2O4 phosphors synthesized by solution combustion method

ZnGa₂O₄ phosphors were synthesized by both SCM (solution combustion method) and SSRM (solid state reaction method). The characteristics of the both ZnGa₂O₄ phosphors were investigated by TGA (Thermogravimetric analysis), SEM (scanning electron microscope), BET (Brunauer Emmett Teller), PL (photoluminescence) and XRD (X-ray diffraction). The particle size of SCM phosphor was about one-hundredth of SSRM phosphor. The PL intensity of SCM phosphor was about 1.5 fold higher than that of SSRM phosphor. The SCM phosphor was also tried to be doped with Mn⁺² ions. The highest PL peak was observed with Mn⁺² ions of 0.003 mole fraction. The peak was shifted from blue (470 nm) to green (513 nm) color. These results might be very useful for high efficiency phosphors for displays such as field emission displays and plasma display panels.     

Preparation and Luminescence Properties of Glass Ceramics Precipitated With $hbox{M}_{bf 2}hbox{MgSi}_{bf 2}hbox{O}_{bf 7}{:},hbox{Eu}^{bf 2+}$ (M = Sr, Ca) Phosphor for White Light Source

$hbox{Eu}^{2+}$-doped silicate glasses were prepared in the system $42hbox{SiO}_{2}$– $gamma hbox{CaO}$– $(38gamma)hbox{SrO}$–$20hbox{MgO}$– $0.2hbox{EuO} (gamma = 0, 10, 20, 30, 38)$ by melting under reducing atmosphere. Glass ceramics precipitated with $hbox{M}_{2}hbox{MgSi}_{2}hbox{O}_{7}{:}hbox{Eu}^{2+}$ (M = Sr, Ca) phosphor were obtained by heat-treatment of the glass. They showed broad emission band due to the 5d $rightarrow$ 4f transition of $hbox{Eu}^{2+}$. The peak wavelength shifted from 470 to 530 nm with increasing CaO content. Their emission wavelength can be controlled by changing the compositional ratio of Ca and Sr. Their color coordinates were widely changed from blue to yellowish green region. We have successfully obtained glass ceramic phosphors with excellent durability for a high-power white LED based on near-UV LED.      

硅酸盐橙红色荧光粉的制备与发光性能研究

通过高温固相合成法制备了高效橙红色荧光粉Sr2.96Eu0.04SiO5,研究了烧结温度、保温时间、助熔剂含量对荧光粉发光性能的影响。通过XRD和光谱测试表征得出：最佳的烧结温度为1 500℃,保温时间为4h;当助熔剂H3BO3为3wt%含量时,荧光粉的结晶程度、发光强度最好。荧光粉的激发峰为宽带激发谱（300～500nm）,发射主峰为597nm。     

Structural and Optical Properties of Size and Morphology Controllable Nanoscale SrAl2O4: Eu2+, Dy3+

Abstract

Nanoscale SrAl₂O₄: Eu²⁺, Dy³⁺ with controllable size and morphology was synthesized by sol-gel auto-combustion method. The surface morphology and structural characterization were carried out with TEM and XRD. Optical properties were analyzed by comparing excitation spectra, emission spectra and afterglow decay of the nanoscale phosphor with that of the bulk phosphor. The results showed that citric acid acted as a soft template in the reaction system. The morphology and size changed clearly with pH value and sintering temperature. The crystallinity was affected by the quantity of citric acid. Both the nanoscale phosphors with different particle size and the bulk one have the strongest emission at 525?nm. But their strongest peaks in excitation spectra are very different from each other. The phosphorescence of nanoscale phosphor decays more rapidly than that of the bulk phosphor.     

Spectroscopy of Pure and Eu 3+ Doped ZnO

Pure and Eu 3+ doped ZnO piezoelectric ceramics and thin films were prepared via solid state chemical reaction and by sol-gel method, respectively. Strong green emission band were observed from all samples. Both broad band emission from ZnO and line emission from Eu 3+ were observed in the sample ZnO doped with Eu 2 O 3 . In contrast to the report in the literature, excitation spectrum showed that energy transfer from ZnO host to Eu ions in these samples was very weak and the transfer was through Eu 3+ absorption of the green emission of ZnO.