Study on Luminescence Properties and Crystal-Lattice Environment of Eu^2＋ in Sr4-xMgxSi3O8Cl4：Eu^2＋ Phosphor

According to the Van Uitert experimental equation, crystal-lattice environment of Eu^2 in the Sr4Si3O8C14 crystal was discussed. By adding Mg^2 to the host lattice, Sr4-xMgxSi3O8C14:Eu^2 was synthesized and the emission peak shifted from blue-green (488nm) to blue-violet (411nm) with the increase of amount of the magnesium which replaced the strontium. By analyzing the spectra of Sr4-xMgxSi3O8C14:Eu^2 the two Eu^2 emission centers were found because of the change of crystal-lattice environment in the host and the crystal structure was obtained by X-ray diffraction data.     

Luminescence and Preparation of LED Phosphor Ca_8Mg(SiO_4)_4Cl_2∶Eu~(2 )

Eu2 isthemostwell knownandextensivelyused activatorinmanysilicates,boratesandotherinorganic compounds[1～4].Itsemissioncomesfrom5d→4ftran sition,andtheemissionwavelengthcanvaryinvery broadranges.Sincethe5delectronsarelocatedat outershelloftheeuropiumion,…     

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…     

Vibrational Spectrum and Luminescence Properties of CaAl_2B_2O_7∶Eu~(3 )

Ｉｎｒｅｃｅｎｔｙｅａｒｓｃｏｍｐｏｕｎｄｓｗｉｔｈｍｉｘｅｄｏｘｉｄｅａｎｉｏｎｓｈａｖｅｂｅｎｓｔｕｄｉｅｄｅｘｔｅｎｓｉｖｅｌｙ［１～６］．Ｉｎａｄｄｉｔｉｏｎｔｏａｆｕｎｄａｍｅｎｔａｌｉｎｔｅｒｅｓｔ,ｔｈｅｐｏｓｉｂｌｅｕｓｅｏｆｔｈｅ...     

Synthesis of Long Afterglow Phosphor CaAl_2Si_2O_8∶Eu~ (2 ), Dy~(3 ) via Sol-Gel Technique and Its Optical Properties

Inrecentyears,thelongafterglowphotolumines centmaterialhasbeenwidelyusedinmanyfields[1,2].Therareearthionsactivatedsilicatesbasedphosphor isbelievedasapromisinglongafterglowmaterialin thenearfutureforitshighchemicalandphysicalsta bility,especiallytheirwat…     

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

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

Luminescence Properties of Eu~(2 ) and Mn~(2 ) Co-Doped Ca_8Mg(SiO_4)_4Cl_2

The green phosphor for white LED, Ca8Mg(SiO4)4Cl2∶Eu2+, Mn2+, was synthesized by high temperature solid state reaction under reducing atmosphere. During the process of the phosphor prepared, the excess CaCl2 can improve the intensity of emission. The experimental results indicate that there is an effective energy transfer from Eu2+ to Mn2+in Ca8Mg(SiO4)4Cl2 host. This kind of energy transfer may be due to resonance transfer, and this energy transfer is limited.     

Luminescence Properties of Green-Emitting Phosphor (Ba_(1-x),Sr_x_2SiO_4∶Eu~(2+) for White LEDS

Whitelightemittingdiode(LED)iswell known assolid statedevicesthatconsistsofablueornear UVLEDchipandblue yelloworblue green red phosphors[1].AwhiteLEDthatcombinesablueLED andaYAGphosphorwasmadeavailableonthemar ketin1996[2].However,furtherstudyindicatedthat whiteLEDbypre coatingblue green redphosphors ontoalongUVLEDchipismuchmoreopticallysta blethantheconventional“blueyellow”whiteLED.Becauseitispossibletoimprovetheluminousefficacy ofwhiteLEDSexcitedbynear UVLEDSinthenear UVtob…     

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…     

Luminescence and Defect Properties of Novel Bluish-Green Phosphor β-Zn_3(PO_4)_2∶Zr~(4 )

Duringlastdecade ,manyresearchershaveshowngreatinterestinluminescencepropertiesofcompoundscontainingM4 ions (M =Ti ,ZrandHf)withtheclosed shell (nd0 )becausetheyhavemorepracticalandpotentialapplications ,suchasphosphorusedinX rayintensifyingscreenandapromisingmaterialap pliedinfracturedetectionsystemofstructureceramicsinthefieldofengineeringmaterials[1,2 ] .Theopticaltransitionsinthesecompoundsareoftheligand -to -metalchargetransfer (LMCT)type .WithinthemtheZr4 -O2 chargetransfertran…     

Displacement and Luminescence of Eu~(3 ) in CaYBO_4

Ａｇｒｅａｔｄｅａｌｏｆｉｎｖｅｓｔｉｇａｔｉｏｎｈａｓｂｅｅｎｃａｒ ｒｉｅｄｏｕｔｏｎｔｈｅｌｕｍｉｎｅｓｃｅｎｃｅｏｆＥｕ3 ｉｎｍａｎｙｈｏｓｔｓ,ｓｕｃｈａｓｔｈｅｃｏｍｍｅｒｃｉａｌｒｅｄｐｈｏｓｐｈｏｒＹ2 Ｏ3∶Ｅｕ ,ｗｈｏｓｅｌｕｍｉｎｅｓｃｅｎｔｑｕａｎｔｕｍｅｆｆｉ ｃｉｅｎｃｙｈａｓａｔｔａｉｎｅｄｎｅａｒｌｙ 1 0 0 %ｕｎｄｅｒ 2 5 4ｎｍｅｘｃｉｔａｔｉｏｎ .Ｉｔｉｓａｌｓｏｔｈｅｈｉｇｈｅｓｔｑｕａｎｔｕｍｅｆｆｉ ｃｉｅｎｃｙｏｆａｌｌｔｈｅｃｏｍｍｅｒｃｉａｌｐｈｏｓｐｈｏ…     

Synthesis,Luminescence and Magnetic Properties of YGa_(3-x)Cr_xB_4O_(12)

Ｓｙｎｔｈｅｓｉｓ，ＬｕｍｉｎｅｓｃｅｎｃｅａｎｄＭａｇｎｅｔｉｃＰｒｏｐｅｒｔｉｅｓｏｆＹＧａ３－ｘＣｒｘＢ４Ｏ１２ＹａｎｇＪｉａｎｍｅｉ（杨健美），ＳｕＱｉａｎｇ（苏锵）（ＬａｂｏｒａｔｏｒｙｏｆＲａｒｅＥａｒｔｈＣｈｅｍｉｓｔｒｙａｎｄＰｈｙ...     

Study on VUV and UV Excitation Spectrum of GdVO_4∶Eu~( 3 )

Ｔｈｅｍｅｒｃｕｒｙ ｆｒｅｅｆｌｕｏｒｅｓｃｅｎｔｔｕｂｅｓａｎｄｐｌａｓｍａｄｉｓｐｌａｙｐａｎｅｌｓｈａｖｅｕｒｇｅｎｔｒｅｑｕｉｒｅｍｅｎｔｔｏｔｈｅｈｉｇｈｌｙｅｆｆｉｃｉｅｎｔａｎｄｓｔａｂｌｅｐｈｏｓｐｈｏｒｆｏｒｅｘｃｉｔａｔｉｏｎｉｎｔｈｅｕｌｔｒａｖｉｏｌｅｔｓｐｅｃｔｒａｌｒｅｇｉｏｎ(ＶＵＶ ,Ｅ >50 0 0ｃｍ-1,λ <2 0 0ｎｍ ) .Ｔｈｅｘｅｎｏｎｄｉｍｅｒｄｉｓｃｈａｒｇｅｉｎｈｉｇｈｐｒｅｓｓｕｒｅｇｉｖｅｓｔｈｅｈｉｇｈｅｓｔｅｆｆｉｃｉｅｎｃｙｏｆａｌｌｎｏｂｌｅｇａｓｅ…     

Study on Luminescence Properties of High-Density Phosphors BiTaO_~(3+) and BiTaO_4

Theparticleenergydetectedbymodernaccelera torsisgettinghigherandhigher ,whichrequiresbetterperformanceforscintillators .Thehigherthedensityofscintillators ,thelargeritslinearattenuationcoeffi cient ,whichcanreducethevolumeofthedetectingcrystalsandcomplicatedandhugeequipmentsoutsideit ,thenreducetheequipmentcostofacceleratorsgreatly .Itsdetectingcrystalconsistsofthousandsup onthousandsofcrystalarrays .Currently ,becauseofitsprominentmeritsofhighdensity (thatis 8.2 9g·cm- 3) ,shortradiationleng…     

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     

Study on Spectra of La_2CaB_(10)O_(19)∶Eu~(3 ) in VUV-VIS Range

Manyboratesareexcellenthostsforrareearthlu minescence ,forexample ,nowbestredphosphorinplasmadisplaypanel (PDP )is (Y1-xGdx)BO3∶Eu[1] .Boratephosphorsdopedwithrareearthionshavebeenrichlystudiedinthepastfewdecades[2 ,3] .RecentlyWuYichengetal .[4 ] synthesizedanewbo rateLa2 CaB10 O19,whichispotentialnonlinearopticalmaterials.InthisworkweselectedLa2 CaB10 O19ashostofluminescencematerialsbecauseitprobablyisabetterhostforrareearthluminescence .Duetotherequirementofplasmadisplaypenal(PDP)…     

Hydrothermal Preparation and Luminescence of LaF_3∶Eu~(3 ) Nanoparticle

Hydrothermal Preparation and Luminescence of LaF_3∶Eu~(3 ) Nanoparticle     

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…     

VUV Spectroscopy of GdPO_4∶Eu~(3 ) and GdBO_3∶Eu~(3 )

VUV Spectroscopy of GdPO_4∶Eu~(3 ) and GdBO_3∶Eu~(3 )@Zimmerer G$Institut für Experimentalphysik der Universitt Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany     

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…