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1、北京交通大學(xué)碩士學(xué)位論文氟化物微晶玻璃制備與其上轉(zhuǎn)換發(fā)光特性研究姓名：佟鵬申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：光學(xué)指導(dǎo)教師：徐敘瑢20080501ABSTRACTUp—conversionluminescencematerialsdopedrareearthionsispaidmuchattentiontointhefieldofrareearthluminescentmaterialsallthetime，itwaswidelyappliedinopticalstorage，opticalcommunicationsystem，nightvisionsystem，las
2、ermedicalinstrumentsandapparatusandsensingdevice，etc．ThelongerlifetimeofexcitedstateelectronwasrequiredSOthattheexcitedelectronCanreceivetheexcitingphotonandtransittohigherlevel．Sothelowphononenergyofhostmaterialsiscritical．Fluorideglassesarehighlydesirablematerialsforup—conversionh
3、ostglasses，withhightransparencyandhighsolubilityforrareearthions．10werphononenergyismostimportant．However,theapplicationoffluorideglassesWasrejected，becauseoftheexpensiveprice，poorstability,noteasytopreparegeneralfiber．Oxidematerialdopedwithrareearthionshassatisfiedchemicalandmechan
4、icalproperties，butphononenergyistoohightodetecttheup—conversionluminescence．Oxyfluoridematerialsarecomposedoffluoridemicro-crystalwhichisinsertedintooxideglasshost．Rareearthionswereprioritydepositedintofluoridemicro-crystal，withlowerphononenergyenvironment．Becausetheoxidatewasdisper
5、sedinthematerial，oxyfluoridematerialshaveexcellentchemicalandmechanicalproperties，moreeasytobepreparedthanthefluorideglassesorcrystal．Sooxyfluoridematerialsarehighlydesirablematerialsforopticalamplification，up-conversionlasersanddisplaydevices．Inthepaper，aseriesoftransparentoxy-fluo
6、rideglass—ceramicsdopedwithEr3十waspreparedbysol-gelmethod，XRDpatternofthesampleindicatetheexistenceofLaF3micro·crystal．TheparticlediameterdatawasobtainedthroughScherrerEquationandSEM．Theup-conversionpropertiesandluminescencemechanismWasinvestigatedthroughtheanalysistoup-conversionsp
7、ectra．Thedataindicatethatup—conversionemissioninthesamplewith5wt％LaF3wasnotobserved，theluminescentdensityincreaseswiththeincreaseofErj+ionsconcentrationinthesamplewithlOwt％LaF3．buttheluminescentdensityreducedinthesampleofEr3+ionsconcentrationmorethan1％．thisreasonresultfromconcentrat
8、ionquench．Therelati
