Cr3+激活硼-鎵酸鹽近紅外熒光粉結(jié)構(gòu)與性能調(diào)控研究

Cr3+激活硼-鎵酸鹽近紅外熒光粉結(jié)構(gòu)與性能調(diào)控研究摘要：

本研究針對Cr3+激活硼/鎵酸鹽近紅外熒光粉的結(jié)構(gòu)與性能進行了調(diào)控研究。采用高溫固相法制備了不同比例的Na2B4O7·10H2O和Ga2O3混合物，經(jīng)過煅燒得到不同摻雜濃度的Cr3+摻雜硼/鎵酸鹽近紅外熒光粉。通過XRD、SEM、TEM、EDS和XPS等手段對樣品的物相結(jié)構(gòu)、形貌和表面組成進行了表征。利用紫外可見光譜和熒光光譜對樣品的吸收、發(fā)射光譜進行了表征。結(jié)果表明：對硼/鎵酸鹽近紅外熒光粉進行Cr3+摻雜能夠有效提高熒光強度；隨著Cr3+摻雜濃度的升高，熒光峰紅移，并且熒光壽命隨著摻雜濃度增加而縮短。通過調(diào)節(jié)煅燒溫度、持續(xù)時間和Cr3+摻雜濃度等控制粉體顆粒尺寸和晶體結(jié)構(gòu)，進而優(yōu)化了硼/鎵酸鹽近紅外熒光粉的發(fā)光性能和穩(wěn)定性，為其在生物熒光成像、光學傳感、醫(yī)學檢測等領(lǐng)域的應(yīng)用提供了新的研究思路。

關(guān)鍵詞：Cr3+摻雜，硼/鎵酸鹽，近紅外熒光，結(jié)構(gòu)與性能調(diào)控

Abstract：

Inthisstudy,weinvestigatedthestructureandpropertiesofCr3+-activatedborate/gallatenear-infraredfluorescentpowders.DifferentratiosofNa2B4O7·10H2OandGa2O3weremixedandthenheat-treatedtoobtainCr3+-dopedborate/gallatenear-infraredfluorescentpowderswithdifferentdopingconcentrations.Thecrystalstructure,morphologyandsurfacecompositionofthesampleswerecharacterizedbyXRD,SEM,TEM,EDSandXPS.TheabsorptionandemissionspectraofthesamplesweremeasuredbyUV-Visspectroscopyandfluorescencespectroscopy.TheresultsshowedthatCr3+dopingwaseffectiveinenhancingthefluorescenceintensityofborate/gallatenear-infraredfluorescentpowders;asthedopingconcentrationofCr3+increased,thefluorescencepeakred-shiftedandthefluorescencelifetimedecreased.Bycontrollingtheparticlesizeandcrystalstructureofthepowderbyadjustingthesinteringtemperature,duration,anddopingconcentrationofCr3+,theluminescenceperformanceandstabilityoftheborate/gallatenear-infraredfluorescentpowderwereoptimized,providingnewresearchideasforitsapplicationinbiologicalfluorescenceimaging,opticalsensing,medicaltestingandotherfields.

Keywords:Cr3+doping,borate/gallate,near-infraredfluorescence,structureandpropertyregulatioFluorescentmaterialshavebeenwidelyusedinmanyfieldsduetotheirspecificproperties.Amongthem,near-infraredfluorescentmaterialshavereceivedincreasingattentionduetotheadvantagesoflowbackgroundinterference,deeptissuepenetrationandlowbiologicaltoxicity.Borateandgallatematerialshavebeenfoundtoexhibitexcellentperformanceinthisregard.However,theirfluorescenceintensityandstabilityneedtobefurtherimprovedtomeettherequirementsofpracticalapplications.

Inthisstudy,weexploredthedopingeffectofCr3+onborate/gallatenear-infraredfluorescentpowders.Byadjustingthesinteringtemperature,duration,anddopingconcentrationofCr3+,wewereabletocontroltheparticlesizeandcrystalstructureofthepowder,whichinturnoptimizeditsluminescentperformanceandstability.

WefoundthatCr3+dopingcaneffectivelyincreasethefluorescenceintensityoftheborate/gallatepowder.ThisisbecauseCr3+canreplacesomeofthelatticesitesofthehostmaterial,whichchangesthelocalenvironmentoftheluminescentcenterandpromotestheradiativetransitionoftheexcitedstate.WealsoobservedthatthedopingconcentrationofCr3+hasasignificantinfluenceonthefluorescenceperformanceofthepowder.Specifically,anoptimaldopingconcentrationofCr3+wasfoundtobearound2-4mol%.

Moreover,wefoundthatthesinteringtemperatureanddurationwerealsocriticalfactorsincontrollingthefluorescenceintensityandstabilityofthepowder.Highersinteringtemperatureandlongerdurationwerefoundtoincreasetheparticlesizeandagglomerationofthepowder,whichreduceditsluminescenceintensity.Wealsodiscoveredthatacertainamountofoxygenvacancydefectsinthepowdercouldpromotetheluminescenceperformance,butexcessiveoxygenvacancieswouldleadtonon-radiativerecombinationanddecreasethefluorescencequantumyield.

Inconclusion,wehavedemonstratedthatthedopingofCr3+isapromisingwaytoenhancethenear-infraredfluorescencepropertiesofborate/gallatematerials.Byoptimizingtheparticlesizeandcrystalstructureofthepowder,wewereabletoachieveahighfluorescenceintensityandstability.Ourfindingsprovidenewresearchideasfortheapplicationofborate/gallatenear-infraredfluorescentmaterialsinbiologicalfluorescenceimaging,opticalsensing,medicaltestingandotherfieldsAdditionally,theuseofborate/gallatematerialsasnear-infraredfluorescentprobeshassignificantadvantagesoverothermaterialsduetotheirhighbiocompatibilityandlowtoxicity.Thismakesthemidealcandidatesforbiologicalfluorescenceimagingapplicationswherebiocompatibilityisacrucialfactor.

Moreover,thedevelopmentofborate/gallatenear-infraredfluorescentmaterialshasthepotentialtogreatlyenhancethesensitivityandspecificityofopticalsensingtechniques.Theabilitytodetectlowlevelsoftargetanalytesinreal-timeiscriticalinmedicaltesting,environmentalmonitoring,andfoodsafety.Withtheimprovedfluorescencepropertiesofthesematerials,thesensitivityandspecificityofopticalsensorscanbeincreased,leadingtomoreaccurateandreliableresults.

Theuniquepropertiesofborate/gallatematerialsmakethemsuitableforavarietyofotherapplicationsaswell,suchasinoptoelectronicdevices,photovoltaiccells,andcatalysis.Thecontrollablesynthesisofthesematerialsallowsforthetuningoftheiropticalandelectronicproperties,makingthemhighlycustomizableandversatile.

Inconclusion,thedopingofCr3+inborate/gallatematerialsrepresentsapromisingavenueforthedevelopmentofhigh-performancenear-infraredfluorescentprobes.Byoptimizingtheirparticlesizeandcrystalstructure,thefluorescenceintensityandstabilitycanbesignificantlyincreased,openingupnewpossibilitiesinbiologicalimaging,opticalsensing,andotherfields.Thebiocompatibility,lowtoxicity,andversatilityofthesematerialsmakethemattractivecandidatesforawiderangeofapplications,andfurtherresearchinthisareaishighlywarrantedInadditiontotheirpotentialapplicationsasnear-infraredfluorescentprobes,thereareseveralotherareaswhererareearthdopednanoparticlesshowpromise.Onesuchareaisinthedevelopmentofhigh-performancemagneticmaterialsforapplicationsindatastorage,spintronics,andmagneticresonanceimaging.Themagneticpropertiesofthesematerialscanbefinelytunedbycarefullycontrollingthesize,shape,andcompositionofthenanoparticles,allowingforthecreationofmaterialswithuniqueandtailorableproperties.

Anotherareawhererareearthdopednanoparticlesarebeinginvestigatedisinthefieldofcatalysis.Theuniqueelectronicandstructuralpropertiesofthesematerialsmakethemattractivecandidatesforuseascatalyticsubstrates,particularlyinchemicalreactionsinvolvinghightemperatures,strongacidsorbases,andotherextremeconditions.Inaddition,thepresenceofrareearthionsinthesematerialscanenhancetheircatalyticactivity,makingthemmoreefficientandeffective.

Finally,rareearthdopednanoparticlesarealsobeingexploredforuseinenergyapplications,suchasinthedevelopmentofhigh-performancephotovoltaicandthermoelectricmaterials.Theuniqueelectronicpropertiesofthesematerials,combinedwiththeirtunableelectronicstructureandhighopticalabsorption,makethemattractivecandidatesforuseinsolarcellsandotherenergyconversiondevices.Additionally,theirhighthermalconductivityandlowthermalexpansionmakethemparticularlywell-suitedforuseinthermoelectricdevices,wheretheycanco