紫外激发白光led用三基色荧光粉的制备与性能分析-(6088)

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1、摘要粉是一种发光性能比较好的蓝白色荧光粉。3+3+利用Sm离子作为激活剂采用高温固相法制备了Ca3SiO4Cl2:xSm红色荧光材料。测量了荧光粉的XRD衍射谱，激发光谱和发射光谱。在紫外光的激发下，该荧光粉的发射光谱为峰值位于564nm、608nm和648nm的三峰谱线，其中位于648nm处的红光发射最强。监测648nm发射峰得到的材料的激发光谱主峰位于363nm、376nm和404nm3+的线状谱线，说明该荧光粉可被紫外光和近紫外光有效的激发。研究了Sm的掺杂浓度对样品发光性能的影响及猝灭机理。结果表明该荧光粉是一种较好的用

2、于白光LED的红色发光材料。关键词白光LED激发光谱发射光谱浓度猝灭能量传递IIAbstractAbstractWhitelight-emittingdiodes(LEDs)areconsideredtobethenextgenerationsolidstatelightingdevicesduetotheirattractiveattributessuchasdurability,smallvolume,longlifetimeandenvironmentfriendly.ThedevelopmentofLEDsisaccel

3、eratedwiththearisingofeffectivelynearUVchipthatcanemit350~400nmlight,whichputforwardhigherrequirementsforeffectivelytri-colorphosphorthatcanbeexcitedbynearUVlight.2+AnovelSr3SiO5:Euphosphorwassynthesizedbyhightemperaturesolidstatemethod.Theemissionspectraarecomposedo

4、ftwoemissionbandscenteredat476and578nm,2+respectivelywhentheconcentrationofEuionsislower.Theblueemissionpeakweakens2+2+graduallywithincreasingofEuconcentrationanddisappearswhenEuconcentration2+reaches1mol%.TheyellowemissionpeakenhanceswithEuconcentrationandthe2+conce

5、ntrationquenchingoccurswhenEuconcentrationreaches1mol%.ThecriticaldistanceRcare3.06and2.62nm,respectivelyaccordingtoDextertheoryandBlasse2+equation.Furthermore,EuionshaveenergytransferinthetwoemissioncenterofSr3SiO5andtheconcentrationquenchingisattributedtoelectricdi

6、pole-dipoletransition(d-d).3+RedSrBPO4:Euphosphorwaspreparedbyhightemperaturesolidstatemethodandthe3+influenceofEuconcentration,typesandcontentoffluxandchargecompensatorontheluminescentpropertiesisinvestigated.TheXRDpatternsindicatethattheSrBPO5samplesaresimplephasea

7、ndthesinteringagainhelpthegrowthofcrystallattice.Thereareemission57peaksat589,596,614,653and687nm,whichthepeakat596nmattributedtotheD0→F1transition,isthebiggest.Theexcitationspectrumconstituteofawidebandattheregionof225to228nmandaseriesofnarrowpeaksfrom280to450nm.The

8、excitationpeakat395nmisthestrongest.TheresultindicatethatthephosphorcanbeexcitedbyUVlightandemitbetterredlight.Theconcentrationquen