Luminescent Properties of A Novel Terbium Complex Tb（o-BBA）3（phen）

A novel rare earth complex of terbium ion with 2-benzoylbenzoic acid and 1, 10-phenathroline （Tb（o-BBA）3 （phen）, o-BBA-2-benzoylbenzoic acid, phen = 1, 10-phenathroline） was used as an electroluminescent material for the first time. The Tb complex was blended with poly（N-vinylcarbazole） （PVK） in different weight ratios and spinn to coated into films （noted as PVK ：Tb films）. The photoluminescence （PL） properties of films were investigated and the optimum weight ratio between PVK and Tb（o-BBA）3（phen） was found to be 3：1. Monolayer devices with the structure ITO/PVK： Tb/AI were fabricated and emitted green light, which was characteristic of Tb^3＋ emission. The results show that mecha- nisms for PL and EL are different. The PL is considered to be caused because of energy transfer and direct excitation to the Tb（o-BBA）3（phen） molecule, while EL is mainly on charging trapping.     

Emission of Rare Earth Complex Tb0.5Eu0.5 （asprin）3phen

The coprecipitate Tho.sEuo.5(asprin)3phen was synthesized. By doping the rare earth complex into polymer PVK, the EL device was fabricated with the structure of ITO/PVK: RE/PBD/AI. Compared with the device using PVK/Eu (asprin)3phen blend as the light emitting layer, the emission of Eu^3 in the PVK/Th0.5Eu0.5(asprin)3 phen blend is great-ly enhanced along with the quenching of the emission of PVK.     

Study on Luminescence Properties of a Novel Rare Earth Complex Eu（ TTA）2 （N-HPA） Phen

A novel rare earth complex Eu（TTA）2（N-HPA）Phen （TTA = thenoyltrifluoroacetone, N-HPA = N-phenylanthranilic acid, and phen = 1,10-phenathroline ）, which contains three different ligands, was synthesized. The Eu complex was blended with poly N-vinylcarbazole （PVK） in different weight ratios and spin coated into films. The luminescence properties of films were investigated and energy transfer between PVK and the complex was discussed. Multilayer structural devices consisting of ITO/PVK： Eu （TTA）2 （N-HPA） phen/BCP/Alq3/Al were fabricated with PVK ： Eu （TTA）2（N-HPA） as light-emitting layer. Increasing the concentration of Eu in the PVK thin film would inhibit the emission of PVK to different degrees. Finally, the pure red luminescence of europium（ Ⅲ ） was observed when the doping weight ratio was approximately 1 ： 5, which indicated an effective energy transfer from PVK to rare earth complex.     

Study of Electroplex Emission from Organic Electroluminescent Devices with Rare Earth Complex

A novel organic electroluminescent device was made with the structure of ITO/PVK：Tb0.5Eu0.5（TTA）3 Dipy/ BCP/Alq3/Al（a） which utilized the rare earth complex Tb0.5Eu0.5（TTA）3 Dipy as the emitting layer. When it was driven under a direct electric field, 612 nm emission from EU^3＋ and 410 nm emission from PVK were observed. In addition, in the EL spectrum a new peak at 490 nm appeared. From the analysis of different devices, the mechanism of the new emission was studied. It was concluded that the new emission was the electroplex originating from the interface between the ligand （TTA）3Dipy and BCP.     

Electroluminescent Property of A Novel Co-Doped Rare Earth Complex

A novel co-doped rare earth complex Gd0.5Eu0.5（TTA）3Dipy was synthesized and chosen as the emitter material in the organic electroluminescent device ITO/PVK：Gd0.5 Eu0.5 （TTA）3Dipy/PBD/A1. It was proved that there was Forster energy transfer from Gd^3＋ to Eu^3＋. The electroluminescent mechanism of the device was proposed by measuring and analyzing the emission and the excitation spectra of the emissive layer. Gd^3＋ might play the role of promoting the en- ergy transfer from PVK to Eu^3＋ and inhibiting an intrinsic luminescence of PVK. The device displayed red light with good monochromaticity. The possible energy transfer process of the device was preliminarily discussed.     

Synthesis and characterization of terbium（Ⅲ）-pyromellitic acid（H4L）-1,10-phenanthroline （phen） luminescent complex

The terbium(Ⅲ)-pyromellitic acid(H4L)-1,10-phenanthroline(phen) luminescent complex was synthesized using a co-precipitation method.The chemical composition of the synthesized complex was speculated to be Tb4L3(phen)0.075·10H2O by elemental analysis,inductively coupled plasma-atomic emission spectroscopy(ICP-AES),and Fourier-transform infrared spectroscopy(FT-IR).The X-ray diffraction analytic results indicated that the synthesized complex is a new crystalline complex,whose structure was different from those of other two ligands.The scanning electron microscopy analytic results showed that the product was of spherical crystals with good dispersion property,and the mean diameter of the spheres was about 1-2 μm.The TG-DTA result showed that the complex had good stability below 489 °C.PL spectra showed that the complex emitted characteristic green fluorescence of Tb(Ⅲ) ion under ultraviolet excitation.     

Preparation and characterization of rare earth fluorescent anti-counterfeiting fiber via sol-gel method

A benzoic acid rare earth(Tb) complex was synthesized and characterized.The excitation and emission spectra of the complex were investigated,and then pure organic complex was incorporated with inorganic matrices(SiO2) through sol-gel method.The composition and structure of the hybrid complex was characterized through the IR spectra,TG,TEM and fluorescent spectrometer.Furthermore,the polypropylene(PP) fluorescent fiber with the organic-inorganic hybrid was prepared by melt spinning.The fluorescent and mechanical properties of the fiber were also tested.The results showed that after sol-gel coating the average particulate dimension of the hybrid rare earth complex was less than 100 nm and thermal stability was improved.Meanwhile,the fiber possessed excellent fluorescent and mechanical properties,which could be used as a candidate applied to excellent fluorescent anti-counterfeiting fiber.     

Luminescent and Thermal Properties of Sm^ 3＋ Complex with Salicylate and o-Phenanthroline Incorporated in Silica Matrix

A ternary Sm（ Ⅲ ） complex with salicylate （sal-） and o-phenanthroline （phen） was synthesized and incorporated in silica matrix by sol-gel method. The luminescence behavior of the complex in silica gel was studied compared with that of the pure complex by means of emission, excitation spectra and thermogravimetic analysis. The results indicate that the fluorescence intensity ratio of the ^4G5/2→^6H9/2 transition to the ^4G5/2→^6H5/2 transition in silica gel doped with Sm（sal）3 （phen） is lower than that of the pure Sm（sal）3（phen）. The thermal stability of Sm（sal）3（phen） is enhanced greatly by the introduction of the complex into silica matrix. An isolated and chemical inert environment of the complex appears to be responsible for the thermal stability enhancement in silica gel.     

Synthesis and luminescent properties of terbium complex with 2-amino-4-chlorobenzoic acid

A novel complex [Tb(L)_2(H_2O)_3·H_2O](where L=2-amino-4-chlorobenzoic acid) was synthesized and characterized by a series of analysis. The molecular formula of complex was confirmed by Fourier transform infrared(FT-IR) spectroscopy and thermogravimetric/differential thermogravimetric(TG-DTG) measurements. The optical properties of complex was measured by ultraviolet spectroscopy(UV) and fluorescence spectroscopy(FS). The results indicated that Tb~(3+) in the complex was coordinated by ligand, and the complex emitted bright yellow-green luminescence with main peak at 548.8 nm with excitation at 369.4 nm.     

Synthesis and luminescent properties of terbium complex containing 4-benzoylbenzoic acid for application in NUV-based LED

A novel Tb(III) ternary complex Tb(p-BBA)_3MAA was synthesized with 4-benzoylbenzoic acid(p-BBA) and methacrylic acid(MAA) as ligands. The complex was characterized by IR, UV-visible, thermogravimetric analysis and fluorescence spectroscopy. Monitored at 544 nm, the complex displayed wide and strong excitation band at 300–400 nm, which matched well with the 365 nm-emitting UV chip. The complex exhibited excellent green emission at 544 nm(~5D_4→~7F_5 transition of Tb~(3+)) under an excitation at 365 nm. Besides, the complex showed high thermal stability. Its intramolecular energy transfer process was further discussed. Furthermore, the complex also had higher fluorescence lifetime(1.38 ms) and higher quantum yield(0.372). Finally, electroluminescent properties indicated that when used to fabricate LED with 365 nm UV chip(power efficiency is 18.6 lm/W), the complex remained its favorable optical performance. These results implied that Tb(p-BBA)_3MAA could be used as a green phosphor for NUV-based white LED.     

Organic Light-Emitting Device Based on Terbium Complex

Organiclight emittingdevices(OLEDs)have beenattractingconsiderableinterestbecauseoftheir lowdrive voltage,potentialapplicationsinflatpanel displaysincethefirstdouble layerstructuredevice withhighefficiencyandluminancewasfabricatedby TangandVanSlykein1987[…     

Emission Characteristics of PVK Doped TbY（o-MBA）6（phen）2 Systems

Since the pioneering work of Tang and VanSlykeon organic light emitting diodes(OLEDs)in1987,OLEDs have been particularlyinterestedin because oftheir potential applications in next-generationflat-pan-el displays and large-area flexible displays[1~3].Rareearth complex materials have been widely used incathodoluminescent display phosphor screens,lasersand lamps because their photoluminescence PL ex-hibits high quantumefficiencies and very sharp spec-tral bands.Inthe1990s,Kido et al[4~6]first…     

Organic Light Emitting Devices Based on Terbium Complex

Rare earth complex Tb(BA)3phen was synthesized, which is first used as an emitting material in electroluminescence. The properties of monolayer device with the swing film rate of 1000 r·min-1(70 nm) and the weight ratio of 1:5(PVK:Tb(BA)3phen) are the best. And the highest brightness of this device reached 26.8 cd·cm-2 at a fixed bias of 21 V. Bright green emission could be obtained from the optimized double-layer device and the highest EL brightness of the device reached 322 cd·m-2 at the voltage of 22 V.     

Preparation,Photo and Electroluminescence Properties of Novel Rare Earth Aromatic Carboxylates

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Syntheses and Characterization of Binuclear Complexes Tb（1-x）Eux（TTA）3 Phen

Rare earth ternary complexes Tb1-xEux（TTA）3Phen（x=0,0.25,0.5,0.75,1.0）were synthesized and characterized by DTA-TG,XRD and infrared（IR）.The photophysical properties of these complexes were studied in detail using ultraviolet absorption spectra and fluorescent spectra.Ultraviolet absorption showed that the energy absorption of the complexes mostly came from ligands.Infrared spectra of Tb1-xEux（TTA）3Phen complexes were similar to the pure complexes.TG curves proved that the complexes were stable.Tb3＋ emission was almost quenched and the Eu3＋ emission was enhanced by codoping the complexes.The Tb3＋ ion acted as an energy transfer bridge that helped energy transfer from poly（N-vinylcar-bazole（PVK）to Eu3＋.In addition,their PL and EL properties were systematically studied.     

Luminescence Characteristic of a New Novel Coprecipitate Rare Earth Complexes

Organicelectroluminescence (OEL)hasbeenex tensivelystudiedbecauseoftheirpotentialapplicationinflatpaneldisplayssincethefirsttwo layerOELde vicewithhighefficiencyandluminancewasfabricatedin 1987[1～ 3] .Rareearth (RE)metalcomplexeshavesomegoodcharacteristics ,suchasextremelynarrowe missionbandsandhighinternalquantumefficiencies ,whicharesuitableforuseastheemissionmaterialsinOEL[4 ] .Tb3+complexwasfirstintroducedintoOELdevices ,andsharpgreenemissionfromTb3+ionhasbeenobserved[5] .Sincethen …