SrAl_2O_4∶Eu~(2+),Nd~(3+) and Dy~(3+) Long Afterglow Phosphor

Longafterglowphosphorabsorbingenergyfromsolar,lampandotherlightsourcesforashorttimestorestheenergyandexhibitsbrightandlong lastingphosphorescencewhichsuitsthevisualperceptionofthehumaneyewithminimumbrightness 0 32mcd·m- 2 andlastingtimemorethan 8h) .TheSrAl2 O4 ∶Eu2 +,Dy3+phosphorhasbeenknowntobeagreenlongafterglowphosphorwithanemissionpeakat 5 2 0nm[1～ 7] .ThepropertiesofthephosphorwerefurtherexaminedbythegroupofTangMingdaoandMatsuzawaTindetailin 1995and 1996respectively[1,2 ] .Inorde…     

Preparation of Stable CaS∶Eu~(2+), Tm~(3+) Phosphor

Alkalineearthsulfides (AES)havebeenfoundtobeexcellentandversatilephosphor ,andrareearthsasactivatorshavebeenintensivelyinvestigated[1～ 7] .Theyholdpromiseforapplicationsinphoto ,electro ,cathoderay ,fieldemissiondisplaysandluminescencepaints[8,9] .However ,alkalineearthsulfidesasaphos phorhosthavebeenfoundtobelimitedinapplica tion ,duemainlytoitssensitivetomoistureandotheratmosphericcomponents .Theirchemicalstabilityagainstatmosphericcarbondioxideandmoisturecouldbeenhancedthroughthegoodcryst…     

Eu^2＋ Luminescence in BaZnAl10O17 ： Eu Phosphor

Eu^2 -doped BaZnAl10O17 phosphor was successfully obtained by coprecipitation method, in which oxalic acid and ammonia were used as precipitants, and precipitates were calcined at 1400 ℃ for 3 h. Its luminescent intensity was much stronger than the one obtained by solid-state reaction at high temperature. According to XRD, the crystal was identified as BaZnAl10O17 with β-Al2O3 structure.     

Preparation, Structural Analysis and Luminescence Properties of Nanocrystalline Phosphor Gd_2O_3∶Eu

Gd2 O3isagoodhostmaterialforluminescenceandhasbeenstudiedwelltheseyears .Gd2 O3dopedwithrareearth (RE)ionsisanidealsystemforfunda mentalresearchsuchasenergytransfer[1] .Moreover ,Gd2 O3∶REhasextensiveuse .Especially ,asahighefficientred emissionluminescentmaterial ,cubicGd2 O3∶EuhasbeenwidelyusedinX rayscintillatormaterial ,highdefinitionprojectiontelevisions ,flatpaneldisplaysandphotoelectronicapparatus[2 ,3] .Inthepastcoupleofdecades ,therehasbeenadramaticgrowthofinterestinnanocrystal…     

Synthesis and Luminescence Properties of Gd_2O_3∶Eu~(3+) Phosphors

Gd2 O3∶Eu3+ isanefficientredemittinglumines centmaterial ,whichcanbeappliedindisplays[1,2 ] .TheconventionalcommercialGd2 O3∶Eu3+ ismainlysynthesizedbyhightemperaturesolid statereactionandchemicalco precipitationmethods .Anadvancedperformanceofdisplaysrequireshighqualityphospho rssuchashighbrightnessandefficiency ,monodisper sityandfinegrainsize .Muchresearchhasanticipatedthatsubmicrometer sizedandnanometerluminescentmaterialswillhavethesepotentialadvantages[3～ 8] ,sosubmicrometer sizedan…     

Characterization of Y_2O_2S∶Eu ~(3+), Mg~(2+), Ti~(4+) Long-Lasting Phosphor Synthesized by Flux Method

Long lastingphosphorescence(LLP)isaproper tyofphosphorswithlongdecaytime,rangingfroma fewminutestotensofhours[1].Inrecentyears,LLP materialshavebeenwidelyusedinmanyfieldssuch asroadsigns,emergencylighting,graphicarts,inte riordecoration,automobileinstrument,andoptical datastorage[2～4].Buttodate,theprogressonred phosphorescenceisveryslow.TheredLLPmaterialbasedonsulfide(CaS∶Eu3+)hasnearly3hafterglow.However,itisex tremelysensitivetomoistureandthuschemicallyun stable[5].CaTiO3∶Pr3+,BaT…     

Synthesis and Photoluminescence of BaMgAl_(10)O_(17)∶Eu~(2 ) Phosphor by Oxalate Co-precipitation Process

Color plasma display panels (PDPs) have attract-ed considerable interest in recent years as componentsof wall-mounted television sets that are large ,flat andthin .In PDPs ,tricolor phosphors are used to convertthe vacuum ultraviolet (VUV) radiation into …     

Synthesis and Luminescence of SrZnO_2∶Eu~(3 ), Li~ Phosphor by Long Wavelength UV Excitation

Synthesis and Luminescence of SrZnO_2∶Eu~(3 ), Li~ Phosphor by Long Wavelength UV Excitation     

Effect of TSL and PSL in Al~(3+)-Doped BaFBr∶Eu~(2+) at Difference Synthesis Conditions

BaFBr∶Eu2 +,asphoto gatedholeburningmateri al[1] ,scintillatorcrystallinematerialandX rayimagestoragematerial ,iscalledphotostimulatedluminescence(PSL)material[2 ] .Theimagingplate (IP)madeofthesephosphorsisnowusedwidelyasdisplayoftwo dimen sionalimagescausedbyionizationradiation[3] .Thecommercialapplicationofthesematerialsbe ganin 1983.Becauseofapplicationofthesephospho rs ,theconventionalX rayfilmmaybereplacedbythescreenmadeofPSLphosphors (alsocalledimagingplate ,IP) [4 ] .IPhasnotab…     

Fluorescence Effect of SrAl_2O_4∶Eu and Diffuse Reflectivity of SrAl_2O_4∶Eu Based Ceramics

Ａｇｒｏｗｉｎｇｉｎｔｅｒｅｓｔａｎｄｐｒｏｍｉｓｉｎｇｐｏｔｅｎｔｉａｌｏｆｈｉｇｈｐｏｗｅｒｓｏｌｉｄｓｔａｔｅｌａｓｅｒｓｈａｖｅｂｅｅｎｓｈｏｗｎｉｎｍａｎｙｈｉｇｈｔｅｃｈｎｉｃａｌｅｎｇｉｎｅｅｒｉｎｇｆｉｅｌｄｓ.Ｉｎｓｏｌｉｄｓｔａｔｅｌａｓｅｒｓ,ｏｎｅｏｆｔｈｅｋｅｙｏｐｔｉｃａｌｐａｒｔｓｉｓｔｈｅｐｕｍｐｉｎｇｃａｖｉｔｙｗｈｉｃｈｒｅｆｌｅｃｔｓｔｈｅｌａｍｐｌｉｇｈｔｔｏｌａｓｅｒａｃｔｉｖｅｃｒｙｓｔａｌｓｏｕｒｃｅ.Ｉｎｔｅｒｍｓｏｆｔｈｉｓａｐｐｌｉｃａｔｉｏｎ,ｔ…     

Preparation and Luminescence Properties of the New Long Phosphorescent Phosphors Ba_(1-x)Ca_xAl_2O_4∶Eu ~(2 ), Dy~(3 )

Inrecentyears ,SrAl2 O4 ∶Eu2 ,Dy3 ,CaAl2 O4 ∶Eu2 ,Nd3 [1～ 8] andBaAl2 O4 ∶Eu2 ,Dy3 [9]havebeenconsideredasusefulblueandgreenphos phorsbytheirlongdurationphosphorescence .Howev er ,toourknowledge ,thephosphorBa1-xCaxAl2 O4 ∶Eu2 ,Dy3 hasnotbeeninvestigated .TheluminescenceofEu2 isverystronglydepen dentonthehostlattice ,whichcanoccurfromtheul traviolettotheredregionoftheelectromagneticspec trum .Itiswellknownthatthepersistentluminescenceisduetothetrappingofenergyinthed…     

Characterization of (Y,Gd)B_xV_(1-x)O_(4-x)∶Eu Phosphor Prepared by Coprecipitation Reaction

The PDP have been widely used for large flatpanel displays.Phosphors for the application in PDPare required to have high conversion efficiency by theVUVradiation of147and/or172nmfromthe Xe andXe-He gas plasma[1].In order to have a good picturequality,much attention has been paid to i mprove ordevelop novel PDP phosphors[2~6].The commercialred emitting PDP phosphor(Y,Gd)BO3∶Eu3+showsthree sharp emissions peaked at593,612and627nm,which are corresponding to the transitions of5D0→7F1,5…     

Luminescent Properties of Y_2O_3∶Eu Nanocrystalls Synthesized by EDTA Complexing Sol-Gel Process

Ｎａｎｏｐａｒｔｉｃｌｅｓａｎｄｎａｎｏｃｌｕｓｔｅｒｍａｔｅｒｉａｌｓａｒｅａｎｅｗｃｌａｓｓｏｆａｄｖａｎｃｅｄｍａｔｅｒｉａｌｓｅｘｈｉｂｉｔ ｉｎｇｕｎｉｑｕｅｃｈｅｍｉｃａｌａｎｄｐｈｙｓｉｃａｌｐｒｏｐｅｒｔｉｅｓｃｏｍｐａｒｅｄｔｏｔｈｏｓｅｏｆｔｈｅｉｒｂｕｌｋｍａｔｅｒｉａｌｓ[1 ] .Ｙ2 Ｏ3 :Ｅｕｉｓａｎｅｆｆｉｃｉｅｎｔｒｅｄ ｅｍｉｓｓｉｏｎｐｈｏｓｐｈｏｒｗｈｉｃｈｈａｓｂｅｅｎｕｓｅｄｉｎｆｌｕｏｒｅｓｃｅｎｔｌｉｇｈｔｓ (ＦＬ)ａｎｄｃａｔｈｏｄｅｒａｙｔｕｂｅ (ＣＲＴｓ…     

Site Selective Spectroscopy of Surfactant-Assembled Y_2O_3∶Eu Nanotubes

Nanometermaterialshaveattractedagreatdealofattentioninthelastdecadebecauseoftheirgreatpo tentialfornanotechnologicalapplicationsandforun derstandingsomefundamentalconceptsabouttherolesofdimensionalityandsizein ,forexample ,optical ,electrical ,andmechanicalproperties[1,2 ] .Differentshapes ,suchasparticles ,films ,wires ,andtubes ,havebeenfabricatedwithvarioustechniques[3～ 6 ] .Inparticular ,thenanotubesusuallypresentnovelproper tiesassociatingwiththeirsmalldimensions ,highanisotropy ,andintr…     

Colour Centres and Energy Transfer in BaF_(2-x)Cl_x∶Eu~(2+) Phosphors

Electron trapping materials(ETMs)have shownpromise in optical storage.The doubly or multi rare-earth doped alkaline-earth sulfides are a class of sti m-ulatable phosphors,which are expected to be used inthe field of optical Parallel Boolean operation,erasable and re-writable optical memory[1~3].In addition,BaFX∶Eu2+(X=Cl,Br)phosphor,which exhibits photo-sti mulated luminescence(PSL)and offers an alternative to conventional X-rayi magingtechnology to increase the i mage definition anddec…     

Sr_2MgSi_2O_7∶Eu,Nd体系中Eu~(2+)向Nd~(3+)的能量传递

通过高温固相法合成了Sr2MgSi2O7∶Eu2+,Nd3+发光材料,测试了样品的物相结构、可见和近红外激发和发射光谱、荧光寿命等,研究了Eu2+对Nd3+的近红外发光性能的影响及近红外发光相对强度变化的规律,考察了煅烧温度、煅烧时间对近红外发光性能的影响。结果表明,1200℃下煅烧的Sr2MgSi2O7∶0.02Eu2+,0.01Nd3+样品近红外发光强度最强,Eu2+对Nd3+的近红外发光敏化效果最好。证实了在Sr2MgSi2O7∶Nd3+,Eu2+体系中Eu2+通过无辐射传递的模式向Nd3+有效传递了能量。     

A New Yellow Long Lasting Phosphor Y_2O_2S∶Ti

Longphosphorescencephosphorshaveattractedconsiderableattentioninrecenthalf century[1] becauseoftheirpotentialapplicationsinsuchfieldsaslumi nouspaint ,safetyindicatorinemergencycase ,etc[2～ 4 ] .Sincethediscoveryofalkali earthaluminatelonglastingphosphorsin 1996 [1] ,theyhavebeenstudiedextensivelyastheyhavebetterstabilityandlongerpersistenttimethanthesulfidephosphorswhichwerewidelyusedinmanycases .Uptonow ,poly crystallinephosphorsofblueCaAl2 O4 ∶ (Eu2 ,Nd3 ) ,greenSrAl2 O4 ∶(Eu2 ,…     

微波合成法制备BaMgAl10O17∶Eu2+蓝色荧光粉

采用微波合成法制备了BaMgAl10O17∶Eu2+(即BAM∶Eu2+)蓝色荧光粉。通过正交试验研究了合成温度、保温时间和升温速率对BAM∶Eu2+蓝粉发光性能的影响。X射线衍射分析表明,微波合成法制备的BAM∶Eu2+蓝粉样品属六方晶系,具有P63/mmc空间群。光谱分析结果表明,样品的峰值波长为450nm,对应于Eu2+的4f65d→4f7(8 S7/2)宽带跃迁,色品坐标x=0.146 3,y=0.069 3,相对亮度为106.8%。粒度分析显示,样品的中心粒径D50=7.00μm,且粒度分布集中。     

Optimization of BaMgAl₁₀O₁₇:Eu²⁺ phosphors by the substitution of Si-N bonds for Al-O bonds

We proposed a simple method to improve the thermal stability of BaMgAl10O17:Eu2+(BAM) phosphors by the substitution of Si-N bonds for Al-O bonds in the host lattice.Both photoluminescence properties and thermal stability under ultraviolet(UV) and vacuum ultraviolet(VUV) excitation could be significantly improved through Si-N incorporation.After thermal degradation at 600 °C for 1 h in air atmosphere,the Si-N doped sample(Ba0.88Eu0.12MgAl9.97Si0.03O16.97N0.03) had the highest emission intensity which was 22% and 40% stronger than that of as-received sample under UV and VUV excitation,respectively.This could be attributed to the stable local structure surrounding the Eu2+ ions and the lower electronegativity of nitrogen.