熒光材料粉體顆粒形貌的控制.pdf

1、蘭州大學(xué)博士學(xué)位論文熒光材料粉體顆粒形貌的控制姓名：李秀娟申請學(xué)位級別：博士專業(yè)：無機化學(xué)指導(dǎo)教師：曾正志荊西平20080501AbstractThisdisserrcationisfocusedonthestudiesoftheparticlemorphologycontrolandtheluminescentpropeniesofthe1uminescentmaterialsThemainresults甜esumm撕zedaSfol

2、lows：1Y3A15012：Tb3andY2Si05：Ce3phosphorS塒thfinemorphologyand900dphotoluminescencewerepreparedbyuSingasolgelmethodCatllodo一1uminescenceintensityofY3A15012：1Fis140％ofcommercialphosphorsatlowVoltlage2Theprocessofparticlegro

3、、vthofY3A15012：Tb3andY2Si05：Ce3phosphorswereinvestigated，andthereasonablemechallismsofpaniclegrowthweregiVen：Withe11llallcingtheheatingtemperature，melargeparrticlesbrokeint0smaUonescominually、vhilethegrainsizeslightlyinc

4、reaSedThefinalproducthasthepaniclesizeaboutlpm，wIlichisagglomeratedbysevemlsmall伊ainswimtensnanometersize3Apotentiall岫inescentmaterialwaSproVided：鋤。叩housY3A15012：Tbj十phosphors塒thgoodphotoluminescence、№repreparedbyusingas

5、ol—gelmethodPhotoluminescenceimensit)rof鋤。甲houSY3A15012：Tb3s鋤pleisabout70％ofpolyc巧stallinephosphorsatlowtempe均t1鵬suchas600℃4AuIlusualbri曲tblueemissionin鋤orphouSY3A15012：TbjSystem、VaSobserved，a11dareaLsonableluminescentme

6、chaIlismisgiVenaSfolloWS：theblueemissionmayarisefbmsomedan91ingbondsorunsaturatedbondsontllesurfaceofsanlplesBesides，aseriesofuniqueexcitationspectraofaⅡlorphousYY3A15012：n3Wc孵inVestigated，thedominatingpeakshiRswithvaria

7、tionalheatingtemperature5AnovelmethodforimproVingparticledistributionauldlumirlescentpropertiesofY2Si05：Ce3pllosphorsbycoatingmethod、vereproVidedAndamechanismfortheparticlesizereductionwaSproposed：Aftercoatinglayersarcpr

8、ecipitatedonthesurfaceofthe伊ains，somestufrisfilledintheneckareaformeddueto蓼aincontactWhenthes鋤pleisarmealed，tllet11icknessofthecoatedlayerssllrim(andtheintemalstressfonnedintllecoatinglayeraroundtheneckareaIfthes骶ssisⅢlb