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…     

Temperature Dependence of Red Long Afterglow from Y_2O_2S∶Eu, Ti, Mg

Temperature Dependence of Red Long Afterglow from Y_2O_2S∶Eu, Ti, Mg     

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 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…     

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…     

Influence of Rare Earth Elements on Luminescent Properties of Y_2SiO_5∶Tb

Various types of multicomponent oxide phosphorshave been widely studied for the applications in dis-play techniques , such as high definition television(HDTV) ,projection television (PTV) and flat paneldisplays (FPD) .Since the beginning of the 1990s ,anewtype of flat panel display device ,field emissiondisplay (FED) has been developed .In this device ,the phosphors are excited bythe cathode rays withlowvoltage ( <5 kV) and high current density . Due tothese excitation conditions ,the ge…     

阴极射线管(CRT)用Y_2O_2S∶Eu红粉的市场、生产和研究

Ｙ２Ｏ２Ｓ∶Ｅｕ是目前彩电和显示器中广泛使用的红色荧光粉，本文对近年来国内外对Ｙ２Ｏ２Ｓ∶Ｅｕ红粉的市场需求和研究状况以及我国的生产状况进行了综述。     

Site Selective Spectroscopy of Suffactant－Assembled Y2O3：Eu Nanotubes

Y2O3:Eu nanotubes were synthesized by a surfactant assembly mechanism. Under ultraviolet-light excitation,the nanotubes present luminescence properties different from that of Y2O3:Eu nanoparticles. The peak position of the charge transfer band in excitation spectra varies with the monitoring emission peaks, while the emission spectra are dependent on the excitation wavelength. Laser selective spectroscopy was performed to distinguish the local symmetries of the Eu^3 ions in the nanotubes. The results of laser-selective excitation indicate that the emission centers near the surface of nanotube wails exhibit inhomogeneously broadened spectra without spectral structures while the two sites (site B and site C) inside the nanotube walls present resolved spectral structures. It is concluded by the number and peak positions of the spectral lines that the sites B and C possess different site symmetries.     

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…     

Effects of Doping Trace Sm~(3+) and Gd~(3+) on Luminescent Character of Y_2O_2S∶Eu~(3+)

Effects of Doping Trace Sm~(3+) and Gd~(3+) on Luminescent Character of Y_2O_2S∶Eu~(3+)     

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…     

Y_2O_3∶Eu荧光粉的制备方法及性质研究进展

本文报道了近年来人们用来制备 Y2 O3∶ Eu粉末的多种方法 (高温固相合成、微波热合成、溶胶 -凝胶技术、共沉淀法、燃烧法、喷雾干燥法、高分子凝胶包膜法 ) ,并对各种合成方法所得产品的粒径、激发与发射光谱以及粉末的发光亮度做了分析和比较 ,同时对各种方法的特点进行了归纳和总结     

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…     

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…     

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 ,…     

Eu~(2+) Luminescence in BaZnAl_(10)O_(17)∶ Eu Phosphor

Ａｎｉｍｐｏｒｔａｎｔｃｌａｓｓｏｆｆｌｕｏｒｅｓｃｅｎｔｌａｍｐａｎｄｐｌａｓｍａｄｉｓｐｌａｙｐｈｏｓｐｈｏｒｓｉｓｂａｓｅｄｏｎｃｏｍ ｐｏｕｎｄｓｏｆｔｈｅａｌｋａｌｉｅａｒｔｈ ｒａｒｅｅａｒｔｈａｌｕｍｉｎａｔｅｓｙｓｔｅｍｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｈｉｇｈｌｕｍｉｎｅｓｃｅｎｔｅｆｆｉ ｃｉｅｎｃｙａｎｄｓｔａｂｉｌｉｔｙｕｎｄｅｒｕｌｔｒａｖｉｏｌｅｔａｎｄｖａｃｕ ｕｍｕｌｔｒａｖｉｏｌｅｔｌｉｇｈｔｅｘｃｉｔａｔｉｏｎ[1] .Ｅｓｐｅｃｉａｌｌｙ ,ａｌｋａｌｉｎｅｅａｒｔｈｈｅ…     

Na_3AlF_6—Al_2O_3—Y_2O_3—MgF_2熔盐体系密度的研究

采用气泡最大压力法测定了2.7NaF·AlF_3(+6wt%MgF_2)～Al_2O_3—Y_2O_3熔盐体系的密度。研究了Al_20_3含量,Y_2O_3含量及温度三变量对体系密度的影响。Y_2O_3与Al_2O_3含量对体系密度的影响,表现出不同的规律,随Y_2O_3含量增加。体系的密度增加;而随Al_2O_3含量增加,体的密度反而下降。随温度的升高,体系的密度非线性地下降。     

Preparation and Photoluminescent Properties of β-Ga_2O_3∶Dy Nanorod Arrays

Preparation and Photoluminescent Properties of β-Ga_2O_3∶Dy Nanorod Arrays     

Preparation and Upconversion Luminescence of Y_3Al_5O_(12):Yb~(3+),Er~(3+)Transparent Ceramics

Crystalline Y3Al5O12(YAG) exists in the cubicform,having a garnet structure[1 ,2],and has excellentchemical stability ,good optical and high temperaturecreep chemical stability[3 ~5]. YAG single crystal hasdrawn considerable attention since the early 1960s ,asit isthei mportant crystal forfluorescent andsolid-statelasers . However ,it is hard to prepare large size sam-ples and dope high concentrationions in YAGcrystal .Conversely ,the fabrication of YAGtransparent ceram-ics is relatively…