基于新型有机红色材料的薄膜电致发光

对一种名为N,N双42(4二氰甲烯基6甲基)4H吡喃2基]乙烯基]苯基苯胺的新型有机红色材料(BDCM)进行了薄膜发光行为的研究.此材料的一个三苯胺(给电子基)和两个二氰甲烯吡喃(受电子基)所形成的较好空间位阻和强荧光发射能力,使得其固体薄膜具有很高的红色荧光量子产率.所构成的ITO/CuPc/DPPP/BDCM/Mg:Ag红色薄膜电致发光器件在外加电压为19V时亮度达到582cd/m².且此器件的发光颜色不随外加电流密度的改变而变化,表明此材料有很好的电子传输和红色发射性能

Organic Thin Film Electroluminescent Device Based on a Novel Red Material

Bright and efficient organic electroluminescent(EL)devices have attracted considerable interest due to their potential application to flat panel display.To realized full color display applications,the three elemental colors of red,green,and blue emitters with sufficiently high luminous and color purity are necessary.After the last two decades of intensive research,a number of green and blue emitters with high luminance,high efficiency,saturated emission,and practical lifetimes have been developed.However,the corresponding development of the red emitters lags significantly behind that for the other two primary colors.Doping a red dye into a suitable host makes most high-performance of red EL devices.Nevertheless,the low efficiency at high doping concentration is due to the concentration quenching effect,which is common in fluorescence dopants.This problem can be avoided by using host red emitting materials,which can be used as emitting layer as well as hole or electron transport layer.In this paper,a novel red luminescent material N,N-bis-4-2-(4-dicyanomethylene-6-methyl-4H-pyran-2-yl)ethylene]phenyl]aniline(BDCM)with two electron-acceptor moieties(4-dicyanomethylene)pyran and an electron-donor moiety triphenylamine for application in organic EL devices was reported.The resultant compound has a sterically well-hindered structure and a high fluorescence yield.Its photoluminescence(PL)of this compound in solid film and EL have been studied.Based on its intense sterically hindered structure,the pure BDCM film prepared shows a bright red PL emission.The EL device with a structure of indium tin oxide(ITO)/copper phthalocyanine(CuPc)/1,3-diphenyl-5-(1-phenanthreneyl)-2-pyrazoline(DPPP)/BDCM/Mg:Ag shows a bright red emission and a brightness of 582cd/m² at a driving voltage of 19V.And it can be found that CIE chromaticity coordinates of the device are nearly unchanged with increasing current density.As expected,the rigidity and non-planar structure of triphenylamine moiety offers BDCM a sterically well-hindered feature,and consequently an excellent pure red emission is obtained even for the pure BDCM.Further,the presence of two electron-acceptor moieties increase the electron affinity of BDCM,and as a result,grant the BDCM efficient electron injection and transport abilities.The combination of above advantages,as the result of incorporating triphenylamiline and two(4-dicyanomethylene)pyrane moieties into one molecule make BDCM serve as host red emitter possible.aniline(BDCM)with two electron-acceptor moieties(4-dicyanomethylene)pyran and an electron-donor moiety triphenylamine for application in organic EL devices was reported.The resultant compound has a sterically well-hindered structure and a high fluorescence yield.Its photoluminescence(PL)of this compound in solid film and EL have been studied.Based on its intense sterically hindered structure,the pure BDCM film prepared shows a bright red PL emission.The EL device with a structure of indium tin oxide(ITO)/copper phthalocyanine(CuPc)/1,3-diphenyl-5-(1-phenanthreneyl)-2-pyrazoline(DPPP)/BDCM/Mg:Ag shows a bright red emission and a brightness of 582cd/m² at a driving voltage of 19V.And it can be found that CIE chromaticity coordinates of the device are nearly unchanged with increasing current density.As expected,the rigidity and non-planar structure of triphenylamine moiety offers BDCM a sterically well-hindered feature,and consequently an excellent pure red emission is obtained even for the pure BDCM.Further,the presence of two electron-acceptor moieties increase the electron affinity of BDCM,and as a result,grant the BDCM efficient electron injection and transport abilities.The combination of above advantages,as the result of incorporating triphenylamiline and two(4-dicyanomethylene)pyrane moieties into one molecule make BDCM serve as host red emitter possible.