氟化物微晶玻璃制备与其上转换发光特性研究

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1、北京交通大学硕士学位论文氟化物微晶玻璃制备与其上转换发光特性研究姓名：佟鹏申请学位级别：硕士专业：光学指导教师：徐叙瑢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