共查询到17条相似文献,搜索用时 390 毫秒
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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。 相似文献
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《中国照明电器》2017,(7)
以主波长为535 nm的(Lu,Y)AG:Ce绿粉和主波长为625 nm的(Ca,Sr)Al Si N3:Eu红粉为研究对象,研究其复合荧光粉的光谱耦合性质和封装LED器件光效、色坐标和色温性能。复合荧光粉以绿粉比红粉为1.1:0.1、1.2:0.1、1.3:0.1、1.4:0.1这四种比例复合而成,随绿红比增加,复合荧光粉发光色坐标在色坐标图上线性变化,根据光学耦合特点,快速得到了2 500 K、2 700 K、3 000 K色温的LED封装需要的绿粉和红粉的比例,结果显示采用该两种粉获得的3 000 K色温的LED器件光通量、光效、显色指数等性能均最佳。 相似文献
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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。 相似文献
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AbstractNanoscale 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. 相似文献
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Luminescent properties of Sr2ZnSi2O7: Eu2+ phosphors prepared by combustion-assisted synthesis method 总被引:1,自引:0,他引:1
A blue-emitting phosphor Sr2ZnSi2O7: Eu2+ was prepared by combustion-assisted synthesis method and an efficient blue emission under from ultraviolet to visible light was observed. The emission spectrum shows a single intensive band centered at 475?nm, which corresponds to the 4f65d1??4f7 transitions of Eu2+. The excitation spectrum is a broad band extending from 250 to 450?nm, which matches the emission of ultraviolet light-emitting diodes (UV-LEDs). The effect of doped Eu2+ concentration on the emission intensity of Sr2ZnSi2O7: Eu2+ was also investigated and the corresponding concentration quenching mechanism is verified to be an electric multipole-multipole interaction. 相似文献
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采用一种新颖的高温熔融淬火的方法,成功地在硼硅酸盐微晶内部制备了CsPbBr3量子点。为了探究钙钛矿量子点形成的最佳条件,对钙钛矿原料分别以Cs∶Pb∶Br=1∶1∶3的摩尔比和Cs∶Pb∶Br=6∶1∶4的摩尔配比进行了对比研究。通过扫描电子显微镜(SEM)对钙钛矿量子点微晶进行了形貌上的表征分析;通过荧光光谱、CIE色度坐标分析其荧光特性。SEM研究结果表明,微晶表面均匀分布着CsPbBr3量子点。在荧光光谱检测下,实现了在360 nm的紫外光激发下,量子点呈现出较强的绿光发射。CIE色度坐标图上显示,钙钛矿原料在Cs∶Pb∶Br=6∶1∶4的摩尔配比下处于较高纯度的绿光区域。因此,量子点可应用于高光效的新型固体发光器件的中。 相似文献