Cr3+激活硼-镓酸盐近红外荧光粉结构与性能调控研究

Cr3+激活硼-镓酸盐近红外荧光粉结构与性能调控研究摘要：

本研究针对Cr3+激活硼/镓酸盐近红外荧光粉的结构与性能进行了调控研究。采用高温固相法制备了不同比例的Na2B4O7·10H2O和Ga2O3混合物，经过煅烧得到不同掺杂浓度的Cr3+掺杂硼/镓酸盐近红外荧光粉。通过XRD、SEM、TEM、EDS和XPS等手段对样品的物相结构、形貌和表面组成进行了表征。利用紫外可见光谱和荧光光谱对样品的吸收、发射光谱进行了表征。结果表明：对硼/镓酸盐近红外荧光粉进行Cr3+掺杂能够有效提高荧光强度；随着Cr3+掺杂浓度的升高，荧光峰红移，并且荧光寿命随着掺杂浓度增加而缩短。通过调节煅烧温度、持续时间和Cr3+掺杂浓度等控制粉体颗粒尺寸和晶体结构，进而优化了硼/镓酸盐近红外荧光粉的发光性能和稳定性，为其在生物荧光成像、光学传感、医学检测等领域的应用提供了新的研究思路。

关键词：Cr3+掺杂，硼/镓酸盐，近红外荧光，结构与性能调控

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