Led用含氮化物红色荧光粉研究VIP免费

摘要摘要近年来,InGaN基白光LED因为其出色的发光性质在照明世界中被广泛应用。传统的白光产生方式是由InGaN基蓝光芯片激发黄色荧光粉产生白光,但是这种白光光谱中的红色光的缺失造成该白光的色温高、显色性能差,因此,为了获得高显色性低色温的白光,红色荧光粉被应用于白光LED中。Eu2+激活的氮化物红色荧光粉可以被蓝光或紫外光有效激发,发射出590-680nm的红光。这种荧光粉具有出色的温度特性和化学稳定性,且波长可调范围广、发光效率高,从而吸引了越来越多的关注。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。关键词:氮化物荧光粉发光白光LEDCaAlSiN3：Eu2+ABSTRACT摘要InGaN-basedwhiteLEDiswidelyappliedinthelightingworldforitsexcellentLuminescentproperties.ThetraditionalwhitelightconslstsofahighperformanceblueledandyellowPhosPhor,butthewhitelightsPeetrumProdueedbythiswaylacksred1ightandcausedhighcolortemperatureandpooreolorperformance.Therefore,inordertomeettheLEDneedsofhighCRI(colorrenderingindex)andlowcolortemperature,redphosphorsareappliedtowhiteLED.Eu2+aetivatednitrideredphosphorcanbeeffectivelyexcitedbyultravioletorbluelightandemit590-68Onmred1ight.Thisphosphornotonlyhasexcellentthermalstabilityandchemicalstability,butalsohaswideemissionwavelengthrangeandhighluminouseffieiency,forwhichattractedmoreandmoreattention.WhiteLEDisakindofenvironmentalandenergy-savinggreenlighting.HowevertheperformanceoftheredemittingphosphorcanaffectthecolorrendingindexandthecolortemperatureofthewhiteLEDextremely.Andthenitrideoroxynitrideredphosphorisaveryhigh-qualitykindforthewhiteLED.Thepresentresearchsitua-tion,crystalstructure,primarypreparationtechnologyofthenitrideandoxynitrideredphosphorsareintroduced.Fortheexistingproblemsintheresearch,thenewresearchdirectionispointedout.KeyWord：:nitrides;phosphorus;luminescence;whiteled;CaAlSiN3：Eu2+目录第一章绪论...........................................................11.1研究意义.......................................................1摘要1.2白光LED氮化物荧光粉简介.......................................21.3国内外白光LED研究现状及发展前景...............................31.4荧光型白光LED的实现途径及其应用...............................5第二章白光LED基本原理................................................92.1荧光粉的发光原理...............................................92.1.1发光的定义和发光材料的分类................................92.1.2发光的主要特征............................................92.1.3Eu2+离子的发光特性.......................................102.1.4荧光材料的能量传输机理...................................102.2LED基本工作原理...............................................112.3LED主要性能指标及其产品分类...................................122.3.1LED主要性能指标.........................................122.3.2LED产品分类.............................................13第三章氮化物荧光粉的研究现状及合成...................................153.1氮化物红色荧光粉的研究现状.....................................153.2氮化物荧光粉的主要类型及特性..................................163.3氮化物荧光粉的性能优势.........................................173.4氮化物荧光粉的主要合成方法....................................17第四章氮化物荧光粉的发光特性研究.....................................23...