LED芯片工艺开发与产品性能优化 原理与设计.docx
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LED芯片工艺开发与产品性能优化 原理与设计.docx
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LED芯片工艺开发与产品性能优化原理与设计
LED芯片
工艺改善与新工艺研发
新产品研发与工艺路线
制定方案
光电子、微电子
材料、物理、化学
LEDchip
Processimprovementanddevelopmentofnewtechnology
Newproductdevelopmentandprocessroute
Programming
Optoelectronics,microelectronics
Materials,physics,chemistry
Nanometerrange:
Anewtheoreticalchallengeformicroelectronicsandoptoelectronics
MicroelectronicsJournal
Theequationisidentified,fromacoupleofoddpercussions,whichyieldsthepilotwaveformingtheauraofaparticleinthespaceconjugatetothefour-dimensionalspaceofdirectexperience.ThisleadstoasubstituteoftheCopenhagenInterpretationprovidingtheframefordemonstratingHeisenberg'suncertaintyprinciplethroughatheoremofFourieranalysis.Revisitingthemethodofspace-timedomainpavesthewaytoaneweraofdevelopments,byconsideringthatatrappedparticlelocatedinaboundedbi-dimensionalspace,havinglessthan1 eVofkineticenergy,shouldhaveanassociatedwavelengthrepresentingafractionofawavecycle.Inordertofacethechallenge,anewoptoelectronicsconceptisproposedtocontendwiththebroadeningofthefrequencybandwidthforaparticle-wavetrappedinasingle-electronbox:
quasi-virtualelectrons,trappedinnanometricsingle-electronthinboxes,interactbyabsorption–emissionprocesseswithcoherentelectromagneticradiations.Themigrationisproposedfornanoelectronictransistorfabricationfromsemiconductortosemi-refractormaterials.
ArticleOutline
1.ReminderofMoore'slaw
2.Modelingofelectromagneticwavepropagation
3.Criterionofreality
3.1.Equationoftheaura
4.Complexspaceversusprobabilityspace
5.Anapproachapplyingthemethodofspace-timedomain
6.Pavingthewaytopracticalphysics
References
Life-timeestimationofhigh-powerbluelight-emittingdiodechips
MicroelectronicsReliability
Wehaveproposedanewconceptofmetalpackagebywhichwecanestimatethelifetimeofbluelight-emittingdiode(LED)chipswithhighaccuracy.ComponentsinconventionalLEDpackagewhichmayobscurethedegradationbehaviorofLEDchipitselfwereremovedorreplacedbyothermaterialsorcomponents.Threekindsofchipsfromdifferentmanufacturerswereanalyzedinthisstudyusingproposedmetalpackages.Inthispaper,theopticalandelectricalcharacteristicssuchaslight-outputdegradationandreverseleakagecurrentofhigh-powerblueLEDchipwereinvestigatedandanalyzed.Also,therelationshipbetweenlight-outputdegradationandelectricalcharacteristicsofLEDchipwasdescribed.Withagingtimeof5000 h,onlyonekindofblueLEDchipshowsenoughlight-outputdegradationtoestimatelife-time.
ArticleOutline
1.Introduction
2.Proposedmetalpackage
2.1.Conceptofproposedmetalpackage
2.2.Characteristicsofthemetalpackage
2.3.Experimentalset-up
3.Results
4.Conclusions
References
CharacteristicenhancementoftheblueLEDchipbythegrowthandfabricationonpatternedsapphire(0 0 0 1)substrate
JournalofCrystalGrowth
Bluelight-emittingdiodes(LEDs)withanInGaNmulti-quantumwell(MQW)structurewerefabricatedonapatternedsapphiresubstrate(PSS)usingasinglegrowthprocessofmetalorganicchemicalvapordeposition(MOCVD).TheelectricalandopticalpropertiesoftheseLEDswereinvestigated.ThecrystalqualityofepitaxialGaNfilmwasimprovedbyusingthePSSstructure.At40 mAinjectioncurrent,thepeakwavelengthandthefull-widthathalf-maximumoftheelectroluminescencespectraofPSSwere461and24 nm,respectively.Theelectroluminescenceintensity(EL)ofLEDsgrownonpatternedsubstratewas2.44timesgreaterthanthatofunpatterenedsapphiresubstrate(UPSS).Theoperatingvoltagewasmeasuredabout3.1 VfortheLEDwithaPSSstructure.ThissignificantincreaseresultedfromtheimprovementoftheepitaxialqualityoftheInGaN/GaNepilayersandtheimprovementofthelightextractionefficiencythroughpatternedsapphiresubstrates.
ArticleOutline
1.Introduction
2.Experimental
3.Resultsanddiscussion
4.Conclusions
Acknowledgements
References
Electrical/electrochemicalimpedanceforrapiddetectionoffoodbornepathogenicbacteria
BiotechnologyAdvances
Therealizationofrapid,sensitive,andspecificmethodstodetectfoodbornepathogenicbacteriaiscentraltoimplementingeffectivepracticetoensurefoodsafetyandsecurity.Asaprincipleoftransduction,theimpedancetechniquehasbeenappliedinthefieldofmicrobiologyasameanstodetectand/orquantifyfoodbornepathogenicbacteria.Theintegrationofimpedancewithbiologicalrecognitiontechnologyfordetectionofbacteriahasledtothedevelopmentofimpedancebiosensorsthatarefindingwide-spreaduseintherecentyears.Thispaperreviewstheprogressandapplicationsofimpedancemicrobiologyforfoodbornepathogenicbacteriadetection,particularlythenewaspectsthathavebeenaddedtothissubjectinthepastfewyears,includingtheuseofinterdigitatedmicroelectrodes,thedevelopmentofchip-basedimpedancemicrobiology,andtheuseofequivalentcircuitsforanalysisoftheimpedancesystems.Thispaperalsoreviewsthesignificantdevelopmentsofimpedancebiosensorsforbacteriadetectioninthepast5 years,focusingonmicrofabricatedmicroelectrodes-basedandmicrofluidic-basedFaradaicelectrochemicalimpedancebiosensors,non-Faradaicimpedancebiosensors,andtheintegrationofimpedancebiosensorswithothertechniquessuchasdielectrophoresisandelectropermeabilization.
ArticleOutline
1.Introduction
1.1.Problemswithfoodbornepathogensanddiseases
1.2.Overviewofdetectionoffoodbornepathogens
1.3.Roleofimpedancetechniquesforbacteriadetection
2.Impedancemicrobiology
2.1.Basisofimpedancemicrobiology
2.2.Classicimpedancemicrobiology
2.3.Impedance-splittingmethods
2.4.Equivalentcircuitanalysisforimpedancecomponents
2.5.Interdigitatedarraymicroelectrodes(IDAs)inimpedancemeasurements
2.6.Microchipsforimpedancedetectionofbacteria
3.Impedancebiosensorsforbacterialdetection
3.1.Impedancepropertiesofbiologicalcells
3.2.Electrochemicalimpedancebiosensorsusingredoxprobes
3.3.Non-Faradaicimpedancebiosensorsforbacterialdetectionwithoutredoxprobes
3.4.Impedancecoupledwithdielectrophoresisandelectropermeabilization
4.Conclusionsandperspectives
Acknowledgements
Phosphorsinphosphor-convertedwhitelight-emittingdiodes:
Recentadvancesinmaterials,techniquesandproperties
MaterialsScienceandEngineering:
R:
Reports
Phosphor-convertedwhitelight-emittingdiodes(pc-WLEDs)areemergingasanindispensablesolid-statelightsourceforthenextgenerationlightingindustryanddisplaysystemsduetotheiruniquepropertiesincludingbutnotlimitedtoenergysavings,environment-friendliness,smallvolume,andlongpersistence.Untilnow,majorchallengesinpc-WLEDshavebeentoachievehighluminousefficacy,highchromaticstability,brilliantcolor-rendingproperties,andpricecompetitivenessagainstfluorescentlamps,whichrelycriticallyonthephosphorproperties.Acomprehensiveunderstandingofthenatureandlimitationsofphosphorsandthefactorsdominatingthegeneraltrendsinpc-WLEDsisoffundamentalimportanceforadvancingtechnologicalapplications.Thisreportaimstoprovidethemostrecentadvancesinthesynthesisandapplicationofphosphorsforpc-WLEDswithemphasisspecificallyon:
(a)principlestotunetheexcitationandemissionspectraofphosphors:
predictionaccordingtocrystalfieldtheory,andstructuralchemistrycharacteristics(e.g.covalenceofchemicalbonds,electronegativity,andpolarizationeffectsofelement);(b)pc-WLEDswithphosphorsexcitedbyblue-LEDchips:
phosphorcharacteristics,structure,andactivatedions(i.e.Ce3+andEu2+),includingYAG:
Ce,othergarnets,non-garnets,sulfides,and(oxy)nitrides;(c)pc-WLEDswithphosphorsexcitedbynearultravioletLEDchips:
single-phasedwhite-emittingphosphors(e.g.Eu2+–Mn2+activatedphosphors),red-green-bluephosphors,energytransfer,andmechanismsinvolved;and(d)newcluesfordesigningnovelhigh-performancephosphorsforpc-WLEDsbasedonavailableLEDchips.Emphasisshallalsobeplacedontherelationshipsamongcrystalstructure,luminescenceproperties,anddeviceperformances.Inaddition,applications,challengesandfutureadvancesofpc-WLEDswillbediscussed.
ArticleOutline
Nomenclature
1.Introduction
1.1.Overview
1.2.Challengeandobjectives
2.Fundamentalaspectsofphosphors-convertedwhiteLEDs
2.1.Basicconcepts
2.1.1.Photoluminescence
2.1.2.Energytransfer
2.1.3.CIEchromaticitycoordinatesandcolortemperature
2.1.4.CRIandluminousefficacy
2.2.Experimentaldescription:
materialssynthesisandfabrication
2.2.1.Solid-statereaction
2.2.2.Solution-basedchemicalsynthesis
3.Phosphorsexcitedbyblue-LEDchips
3.1.Garnetphosphors:
materials,techniqueandproperties
3.1.1.CrystalstructureofYAG
3.1.2.CompositiondependentstructureandpropertiesofYAG:
Ce
3.1.3.YAG:
Cephosphor:
materialssynthesis,characterizationandproperties
3.1.4.PackagingperformanceofYAG:
Cephosphor
3.1.5.Temperature-quenchingofYAG:
Ce
3.1.6.Othergarnets
3.2.Non-garnetoxide-basedphosphors
3.3.Sulfides
3.4.Nitridesandoxynitrides
4.PhosphorsexcitedbyNUV-LEDchips
4.1.Single-phasedwhite-emittingphosphorsinpc-WLEDs
4.2.Tri-colorphosphors
4.2.1.Bluephosphors
4.2.2.Greenphosphors
4.2.3.Redphosphors
4.2.3.1.Mn2+asluminescentcenter
4.2.3.2.Eu3+asluminescentcenter
5.Concludingremarksandperspectives
Acknowledgements
Plasmonics:
thenextchip-scaletechnology
MaterialsToday
Thedevelopmentofchip-scaleelectronicsandphotonicshasledtoremarkabledata
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