三井矿业研发出新型高效硫化物荧光粉

日本三井矿业冶炼公司（MitsuiKinzoku）研发了一种白光LED用硫化物荧光粉材料。公司称,已经发明了红色和绿色荧光粉,可以结合蓝光LED产生白光,这与传统采用蓝光LED激发氧化物荧光粉产生白光的方法并不相同。     

白光LED用稀土红色荧光粉的研究进展

白光LED具有低压、低功耗、高可靠性和长寿命等一系列优点,是一种符合环保和节能的绿色照明光源。现阶段制造高显色指数、低色温,大功率白光LED是白光LED发展的总体趋势。而红色荧光粉性能对白光LED的显色指数及色温的影响极其显著。本方法着重介绍和评述了白光LED用红色荧光粉硫化物、氮化物、钼酸盐和钨酸盐等几大主要体系的发光性质及最新研究成果和发展现状,并对白光LED用荧光粉的发展进行了展望。     

白光LED及其涂敷用荧光粉的研究进展

白光LED因其低能耗、无污染、长寿命等优点被称作第四代照明光源,应用前景广阔.简要介绍了LED的特点,比较了实现白光LED的几种方法.综述了光转换法中白光LED用荧光粉的制备方法,总结了白光LED用荧光粉种类,重点分析介绍了紫外激发型白光LED用荧光粉的优缺点和发展现状,并对白光LED及其涂敷用荧光粉的发展进行了展望.     

白光LED用红色荧光粉的研究进展

白光LED具有低压、低功耗、高可靠性和长寿命等一系列优点,是一种符合节能环保的绿色照明光源.现阶段的白光LED显色指数低、色温较高,限制了白光LED在室内照明等领域的发展,而红色荧光粉能对白光LED的显色指数的提高及色温的改善影响极其显著.主要介绍白光LED用红色荧光粉几大主要体系的发光性质及最新发展现状.     

硼酸盐体系单一基质白光LED荧光粉的研究进展

白光发光二极管(LED)具有低能耗、高效率、长寿命和无汞污染等优点,被誉为新一代固体照明光源。紫外-紫外光激发的白光LED用单一基质白光荧光粉具有独特优势,成为白光LED的研究热点。主要探讨了硼酸盐体系单一基质的白LED光荧光粉的研究进展。     

单一基质白光LED用荧光粉的研究进展

白光LED被称为第四代照明光源,具有广阔的应用前景。单一基质白光LED用荧光粉因其具有独特的优势而被广泛关注,研制单一基质白光LED用荧光粉具有十分重要的意义。详细介绍了目前国内外单一基质白光LED用荧光粉的研究进展,重点对硅酸盐、磷酸盐等几类单一基质白光LED用荧光粉的研究现状作了评述,指出了当前存在的问题,并展望了其发展前景。     

白光LED用荧光粉的研究进展

白光LED被称作第四代照明光源,有着庞大的市场.综述了目前国内外白光LED用荧光粉的几种制备方法,总结了它们的优缺点,概述了白光LED用荧光粉的激发光谱和发射光谱的特性,并指出了白光LED用荧光粉发展中需要解决的问题.     

白光LED用氮化物及氮氧化物红色荧光粉的研究现状

白光LED是一种符合环保和节能的绿色照明光源,而红色荧光粉的性能对白光LED的显色指数及色温的影响极其显著.氮/氮氧化物体系红色荧光粉是一种非常优质的LED用荧光粉.介绍了氮/氮氧化物红色荧光粉的研究现状、晶体结构、主要的制备方法,针对目前还存在的一些问题,指出了今后的研究方向.     

白光LED用荧光粉最新研究进展

白光LED具有节能、环保、寿命长等优点,被称为第四代照明光源,具有广阔的应用前景。主要阐述了几种白光LED用荧光粉的最新研究发展,提出了各种荧光粉存在的问题并对各种白光LED用荧光粉的发展方向进行了展望。     

白光LED用单一基质白光荧光粉的研究进展

白光LED以其独特优势被称为第四代光源,具有广阔的应用前景。单一基质白光荧光粉(SMWP)因颜色稳定、色彩还原性好,成为白光LED用光转换材料的研究热点。概述了由近紫外LED芯片激发的白光荧光粉的研究现状,指出了该荧光粉存在的问题并对其发展趋势做了展望。     

近紫外光激发的白光LED用单基质硅酸盐荧光粉的研究进展

白光LED被称作第4代照明光源,有着庞大的应用市场.荧光粉光转换白光LED是当今固态照明的主流方案.研制近紫外光激发的白光LED用单基质硅酸盐荧光粉具有十分重要的意义.综述了目前国内外这一领域的研究进展,并指出了当前存在的问题及未来的发展方向.     

Use of LiF flux in the preparation of Ca3Sc2Si3O12:Ce3+ phosphor by sol-combustion method

LiF flux was added when prepare Ca₃Sc₂Si₃O₁₂:Ce³⁺ phosphors with sol-combustion method using urea as a fuel and chelating agent. Investigation of phase, morphology and photoluminescence of the phosphors reveals that this kind of method can decrease the phase-forming temperature by 400–500 °C and the phosphors show more uniform morphology and more excellent photoluminescence properties compared to conventional solid-state method. As one of the most important parameters for phosphors used in white light emitting diodes, the thermal quenching properties of the prepared samples are compared and discussed. The fabrication of single-color light emitting diodes show the Ca₃Sc₂Si₃O₁₂:Ce³⁺ phosphor prepared by sol-combustion method with LiF flux can be considered as a more promising high efficiency candidate used for white light emitting diodes than the phosphor made by solid-state method.     

固体照明光源-白光LED的研究进展

回顾了照明光源的历史,介绍了实现白光LED的基本原理和方案,分析了国内外固态照明的发展现状,指出白光LED目前存在的问题,并对发展白光LED进行了展望.     

单基质白光LED荧光粉研究进展

白光LEDs(White Light-Emitting Diodes, WLEDs)作为一种新型的固体照明光源, 相对于已有光源(白炽灯、荧光灯等)具有发光效率高、响应速度快、寿命长等优势, 在照明和显示领域有着广阔的应用前景。目前获取WLEDs最常用的方法是蓝光LED芯片激发YAG : Ce ³⁺黄光荧光粉以及紫外-近紫外芯片激发三基色荧光粉(RGB混合荧光粉), 相比于以上两种方式, 单基质WLEDs荧光粉由于能克服传统RGB荧光粉颜色再吸收及配比调控的问题, 获得较高的流明效率及较高色彩还原性而受到越来越多的关注。目前关于单基质白光荧光的研究已有大量文献报道, 涉及多种材料体系, 按照发光原理的不同, 可以将其地简单分为单离子激发体系、多离子激发体系以及不依赖于稀土离子发光的其他体系等。本文综述了单基质WLEDs荧光粉的研究进展, 指出了其发展中存在的问题, 并对未来发展趋势作了展望。     

白光LED用光转换材料的研究与发展

白光LED是新一代半导体照明光源,高效光转换材料的合成制备是其关键技术之一.简要介绍了白光LD的基本原理,分析了光转换材料的光转换性及其影响因素,综述了白光LED用光转换材料体系和性能特点,最后探讨了光转换材料的发展趋势.     

Synthesis and luminescence properties of Sr2SiO4: Eu3+, Dy3+ phosphors by the sol-gel method

The Sr2SiO4:Eu3+, Dy3+ phosphors for white light emitting diodes (LEDs) were synthesized by the sol-gel method. The microstructure and luminescent properties of the obtained Sr2SiO4:Eu3+, Dy3+ particles were well characterized. The results demonstrate that the Sr2SiO4:Eu3+, Dy3+ particles, which have spherical morphology, emitted an intensive white light emission under excitation at 386 nm. The phosphors show three emission peaks: the blue emission at 486 nm corresponding to the 4F(9/2)-6H(15/2) transition of Dy3+, the yellow emission at 575 nm corresponding to the 4F(9/2)-6H(13/2) transition of Dy3+, and the red emission at 615 nm corresponding to the 5D0-7F2 transition of Eu3+. At the same time, the effect of Eu3+ concentration on the emission intensities of Sr2SiO4:Eu3+, Dy3+ was investigated in detail. The phosphors used for white LEDs were obtained by combining near ultraviolet (NUV) light (386 nm) with Sr2SiO4:0.04Dy3+, 0.01Eu3+ phosphors with the characteristic of Commission Internationale de l'Eclairage (CIE) chromaticity coordinate (x, y) of (0.33, 0.34), and color temperature Tc of 5,603 K. In addition, the effect of the charge compensators (Li+, Na+, and K+ ions) on the photoluminescence (PL) emission intensities were studied.     

Photonic Crystal Phosphors Integrated on a Blue LED Chip for Efficient White Light Generation

Following the proof‐of‐concept experiment in the unit structure level, photonic crystal (PhC) phosphors—structurally engineered phosphor materials based on the nanophotonics principles—are integrated with a blue light‐emitting diode (LED) chip to demonstrate a compact and efficient white light source. Red‐ or green‐emitting CdSe‐based colloidal quantum dots (CQDs) are coated on a Si₃N₄ thin‐film grating to fabricate PhC phosphors. The underlying PhC structure is designed such that the photonic band‐edge modes at the zone center (k_∣∣ = 0) are tuned to the energy of the blue excitation photons. By progressively stacking the PhC phosphor plates on a blue LED chip, the blue, green, and red emission intensities can be tightly controlled to obtain white light with the desired properties. The chromaticity coordinates, (0.332, 0.341), and correlated color temperature, 5500 K, are obtained from a stack of 3 red and 11 green PhC phosphor plates; in contrast, a stack of 5 red and 16 green reference phosphor plates are required to generate a similar white light. Overall, the PhC phosphors produce 8% higher total emission intensity out of 33% less amount of CQDs than the reference phosphors.     

Optical properties of Eu<Superscript>3+</Superscript> activated SrLa<Subscript>2</Subscript>O<Subscript>4</Subscript> red-emitting phosphors for WLED applications

The SrLa_2?xO₄:xEu³⁺ phosphors are synthesized through high-temperature solid-state reaction method at 1473 K with various doping concentration. Their phase structures, absorption spectra, and luminescence properties are investigated by X-ray diffraction (XRD), UV–Vis spectrophotometer and photoluminescence spectrometry. The intense absorption of SrLa_2?xO₄:xEu³⁺ phosphors have occurred around 400 nm. The prominent luminescence spectra of the prepared phosphors exhibited bright red emission at 626 nm. The doping concentration 0.12 mol% of Eu³⁺ is shown to be optimal for prominent red emission and chromaticity coordinates are x?=?0.692, y?=?0.3072. Considering the high colour purity and appropriate emission intensity of Eu³⁺ doped SrLa₂O₄ can be used as red phosphors for white light emitting diodes (WLEDs).