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1、NewfreeformlensesforwhiteLEDswithhighcolorspatialuniformity1211,3,*ShuimingLi,KaiWang,FeiChen,andShengLiu1DivisionofMOMES,WuhanNationalLaboratoryforOptoelectronic,SchoolofOptoelectronicsScienceandEngineering,HuazhongUniversityofScience&Technology,Wuhan430074,China2GuangdongRealFaithOpto-el
2、ectronicCo.,Ltd,Foshan528000,China3InstituteforMicrosystems,SchoolofMechanicalScienceandEngineering,HuazhongUniversityofScience&Technology,Wuhan430074,China*victor_liu63@126.comAbstract:Anovelfreeformlensstructuremadeupoftwosurfacesisproposedandoptimizedtoenhancethecolorspatialuniformity(C
3、SU)ofwhitelight-emittingdiodes(LEDs).Comparedwithourpreviousmethod,animproveddesignmethodbyoptimizingthelightenergymappingrelationshipisproposedtoeliminatethedarkarea,whichappearsintheilluminationpatternduetoadeepbatwingluminousintensitydistribution.Moreover,experimentswithasignificanteval
4、uationfunctionareperformedanddemonstratethattheCSUintermsofcolordifference(Δuv'')canbeenhancedashighas92%.Inaddition,thisnovellenscanfurtherimprovetheCSUofwhiteLEDswithconformalcoating.High-qualityilluminationpatternwithoutyellowringsanddarkareascanberealizedbasedonthisnovelfreeformlenswit
5、hlittlelightloss.©2012OpticalSocietyofAmericaOCIScodes:(220.4298)Nonimagingoptics;(230.3670)Light-emittingdiodes;(220.3630)Lenses;(330.1710)Color,measurement.Referencesandlinks1.M.G.Craford,“LEDsforsolidstatelightingandotheremergingapplications:status,trends,andchallenges,”Proc.SPIE594101,
6、(2005).2.E.F.Schubert,Light-EmittingDiodes(CambridgeUniversityPress,2006).3.S.LiuandX.B.Luo,LEDPackagingforLightingApplications:Design,ManufacturingandTesting(JohnWileyandSon,2011).4.ENERGYSTAR,ProgramRequirementsforSolidStateLightingLuminaires(U.S.EnvironmentalProtectionAgencyandU.S.Depar
7、tmentofEnergy,2007).5.I.Ashdown,“Chromaticityandcolortemperatureforarchitecturallighting,”Proc.SPIE4776,51–60(2002).6.Z.Y.Liu,S.Liu,K.Wang,andX.B.Luo,“OpticalanalysisofcolordistributioninwhiteLEDswithvariouspackagingmethods,”IEEEPhoton.Technol.Lett.20(24),2027
