上转换发光机理总结课件

几种基本的上转换过程一.双光子吸收几种基本的上转换过程一.双光子吸收1二.激发态吸收几种基本的上转换过程二.激发态吸收几种基本的上转换过程2三.能量共振传递几种基本的上转换过程三.能量共振传递几种基本的上转换过程3四.光子雪崩几种基本的上转换过程四.光子雪崩几种基本的上转换过程4五.其他合作敏化合作发光几种基本的上转换过程五.其他合作敏化合作发光几种基本的上转换过程5Inordertoobservebimolecularquenchingofthetripletexcitedstateofthesensitizerthetripletacceptorenergymustbelowerthanthetripletenergyofthesensitizer.Thegreatertheenergydifferencebetweenthetripletsensitizerandtripletacceptor,thegreaterthedrivingforceforthisreactionandgenerallyspeaking,themorefavorablethetripletenergytransferprocess.Itisalsoadvantageoustouseacceptors/annihilatorswithnearunityfluorescencequantumyieldssincethisvalueultimatelycontributestotheoverallupconversionquantumefficiency.Thesensitizer(donor)moleculeischosensothatitssingletexcitedstateliesbelowthatoftheacceptor'ssingletmanifoldwhilethesensitizer'stripletstateliesabovethatoftheacceptor.Inessence,thesingletandtripletexcitedstatesofthesensitizershouldbestrategicallynestedbetweenthesingletandtripletexcitedstatesoftheacceptor/annihilator.Aslongasthesespecificenergycriteriaaremetandthecombinedtripletenergyfromtwoacceptormoleculesisgreaterthanorequaltotheacceptor'ssingletstateenergy,thenconditionsareappropriatefortheobservationofupconvertedfluorescencefromthesampleTTET-TTA过程Inordertoobservebimolecula6镧系三价离子能级图镧系三价离子能级图7实例（1）Yb/Er,Yb/TmJournalofAlloyandCompoundsVolume509,Issue5,10February2011实例（1）Yb/Er,Yb/TmJournalof8实例（1）Yb/Er,Yb/Tm实例（1）Yb/Er,Yb/Tm9实例（2）Yb/Ho/Ce,Yb/Ho实例（2）Yb/Ho/Ce,Yb/Ho10实例（2）Yb/Ho/Ce,Yb/Ho实例（2）Yb/Ho/Ce,Yb/Ho11实例(3)Gd(Ⅲ)的能量传递实例(3)Gd(Ⅲ)的能量传递12实例（4）Mn