电子信息工程基于led的白色光源的寿命毕业论文外文文献翻译及原文

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1、毕业设计（论文）外文文献翻译文献文献文献文献院、资料中文题目.•基于LED的白色光源的寿命、资料英文题目：LifeofLED-BasedWhiteLightSources、资料来源：、资料发表（出版）日期：（部）：专业：班级：姓名：学号：指导教师:翻译日期:2017.02.14英语原文:LifeofLED-BasedWhiteLightSourcesTheinterestforusinglight-emittingdiodes(LEDs)fordisplayandilluminationapplicationshasbeengrowingsteadilyoverthepastfewy

2、ears.Thepotentialforlonglifeandreducedenergyusearetwokeyattributesofthisrapidlyevolvingtechnologythathavegeneratedsomuchinterestforitsuseintheabovementionedapplications.Traditionally,thelamplifeoflightsourcescommonlyusedinilluminationapplicationsisdeterminedbysubjectingthemtoapredeterminedon/of

3、fcycleuntilhalfthenumberoflightsourcesceasetoproducelight.Unlikethesesources,LEDsrarelyfailcatastrophically;instead,theirlightoutputslowlydegradesovertime.EvenifanLEDistechnicallyoperatingandproducinglight,atsomepointtheamountoflightproducedbytheLEDwillbeinsufficientfortheintendedapplication.Th

4、erefore,thelifeofanLEDshouldbebasedontheamountoftimethatthedevicecanproducesufficientlightfortheintendedapplication,ratherthancompletefailure.Basedonthisargument,arecentpublicationfromanindustrygroupdefinesthelifeofanLEDdeviceorsystemforuseingenerallightingapplicationsastheoperatingtime,inhours

5、,forthelightoutputtoreach70%ofitsinitialvalue.ThemostwidelyusedwhiteLEDsincorporatealayerofphosphoroveraGaN-based,short-wavelengthlightemitter.Usually,thephosphorisembeddedinsideanepoxyresinthatsurroundstheLEDdie.Someportionoftheshort-wavelengthradiationemittedbytheLEDisdown-convertedbythephosp

6、hor,andthecombinedradiationcreateswhitelight.EarlywhiteLEDswerepackagedsimilartotheindicator-stylecoloredLEDs,specifically5mmandSMD(surfacemountdevices).Althoughtheseproductsdemonstratedtheconceptofawhitelightsource,theydidnotproducesufficientlightfordisplayandilluminationapplications.Furthermo

7、re,theseindicator-stylewhiteLEDshadarelativelyshortlife,5000-10OOOhtoreach70%lightlevelundernormaloperatingconditions.Toaddressthehigherluminousfluxrequirements,manufacturershavestartedtocommercializehigh-powerilluminatorLEDsthata