Eu3+配合物红色有机电致发光器件

合成了一种新型的Ｅｕ＾３＋配合物－Ｅｕ（ＢＡ）２（ＭＡＡ）（Ｐｈｅｎ）,并将其作为红光发射材料制备了结构为Ｇｌａｓｓ／ＩＴＯ／Ｅｕ（ＢＡ）２（ＭＡＡ）（Ｐｈｅｎ）／Ａ１ｒ的有机电致发光薄膜器件。这种材料具有很强的荧光和很好的单色性且比较强的电致发光。器件的开戾电压为１２Ｖ。在电压为２６Ｖ的正向驱动下,器件的亮度为１５ｃｄ／ｍ＾２,发光效率为０．２５１ｍ／Ｗ。结合测量粉末、薄膜状态下的荧光光谱、激发     

新型稀土配合物红色有机电致发光器件

合成了一种新型的共掺杂稀土Eu-Gd配合物Gd0.5Eu0.5(TTA)3Dipy,将其作为红光发射材料制备了结构为ITO/PVK:Gd0.5Eu0.5(TTA)3Dipy/PBD/Al的有机电致发光薄膜器件,得到了单色性好的红色有机电致发光器件,器件的开启电压为9 V,在16 V时达到最大亮度109 nit.研究了Eu-Gd配合物与PVK共掺杂体系的激发光谱和光致发光谱,结果发现两者间存在着能量转移,表明Gd3 的存在促进了PVK到Eu3 的能量传递.     

稀土有机配合物电致发光器件的研究进展

概述了稀土有机配合物电致发光薄膜器件的材料、结构、发光机理以及目前研究的状况、出现的问题和研究的发展趋势.     

稀土配合物有机电致发光

稀土元素具有独特的电子层结构，是一类丰富的发光材料宝库。将稀土配合物应用于有机电致发光显示器件（OLED）对于实现全彩色显示具有重要意义。与通常的有机电致发光显示器件相比。稀土配合物有机电致发光器件具有高色纯度发射和高内量子效率的优点。本文概述了稀土配合物分类、稀土配合物有机电致发光器件研究进展和优点，着重研究了稀土离子及其OLED器件的发光机理。     

一类有机配合物的蓝色电致发光

将一类有机配合物ＮＧＣ溶于氯仿中,加入少量ＰＭＭＡ后用旋涂法制得单层薄膜电致发光器件,得到了稳定的蓝色发光。在这些配合物中掺入适量ＰＰＶ衍生物,可将蓝色发光提高几十倍,这归结于载流子的平衡注入。     

一种新型Ir(Ⅲ)配合物磷光材料的电致发光性能研究

合成了一种新的磷光Ir(Ⅲ)配合物Ir(NCPy)2acac,其中NCPy和acac分别代表9-(2-萘基)-3-吡啶-咔唑和乙酰丙酮。利用该配合物制备了掺杂的有机发光二极管(OLEDs)。其中掺杂器件在513nm处有较强的金属配合物三重态的绿色磷光发射,最大亮度为24340cd/m2,最大电流效率为16.45cd/A,色坐标为(0.26,0.62),是首次报道的新型Ir(Ⅲ)配合物绿色磷光材料。     

一种基于液晶性质的Pt配合物磷光材料电致发光器件

采用聚合物掺杂的方式,利用旋涂工艺制备了ITO/PVK:TOPPt/BCP(20 nm)/Mg:Ag(200 nm)结构的有机电致发光器件(OLED)。对掺杂浓度为2%(器件A)和4%(器件B)的磷光聚合物掺杂体系的光致发光(PL)和电致发光(EL)性质进行了分析研究,并对主体材料PVK到磷光客体材料TOPPPt的能量传递机制进行了讨论。实验表明,器件的EL谱谱峰位于625 nm,器件A在25 V时最大亮度为3037 cd/m2,最大电流效率为3.15cd/A。器件的EL谱不会随着偏置电压和掺杂浓度而改变,器件具有较好的稳定性。     

有机金属配合物电致发光材料

介绍有机金属配合物在有机电致发光中的应用。     

Tb配合物TbY(o-MOBA)6(phen)2·2H2O的电致发光器件

合成了一类新型稀土配合物TbY(o-MOBA)6(phen)2·2H2O,将其掺杂到导电聚合物聚乙稀咔唑(PVK)中获得了纯正、明亮的绿光发射.用这种掺杂体系分别制作了2类器件:1) ITO/PVK:TbY(o-MOBA)6(phen)2·2H2O/LiF/Al;2) ITO/PVK:TbY(o-MOBA)6(phen)2·2H2O/BCP/AlQ/LiF/Al.器件1的起亮电压为13 V,在21 V时最大亮度为18.2 cd/m2;结构优化的器件2,在23 V 时最大亮度可达124.5 cd/m2.将这种材料的发光性能与另一种稀土配合物Tb(o-MOBA)3phen·H2O相比较,并分别讨论了其光致发光(PL)和电致发光(EL)机理.     

锌金属配合物BFHQZn的白色有机电致发光器件

利用新型荧光染料2-溴-4-氟苯乙烯-8-羟基喹啉锌(BFHQZn,(E)-2-(2-bromo-4-fluorostyryl)quinolato-Zinc)的电致发光(EL)特性,制备了非掺杂型的有机电致白光器件(WOLED)。器件的结构为ITO/CuPc(10nm)/NPBX(25 nm)/BFHQZn(18 nm)/NPBX(xnm)/BCP(10 nm)/Alq3((47-x)nm)/LiF(0.5 nm)/Al,当x为12时,得到了色度最好和效率最大的WOLED,最大电流效率为1.11 cd/A(at 10 V),最大的亮度为817 cd/m2(at 15 V),当驱动电压从7 V(启亮)升高到15 V(最高亮度)时,器件色坐标由(0.32,038)改变为(0.30,0.28)。     

Highly Efficient Deep Blue Phosphorescent OLEDs Based on Tetradentate Pt(II) Complexes Containing Adamantyl Spacer Groups

Tetradentate Pt(II) complexes are promising emitters for deep blue organic light-emitting diodes (OLEDs) due to their emission energy and high photoluminescence efficiency. However, to obtain a pure blue color, spectral red-shifts, and additional emission peaks at longer wavelengths, originating from strong intermolecular interactions between parallel Pt(II) complexes, must be avoided. Herein, a new class of deep-blue emitting tetradentate Pt(II) complexes consisting of a non-planar ligand and a bulky adamantyl group is reported. The six-membered metallacycle structure renders the Pt(II) complex non-planar. In addition, the bulky adamantyl groups increase intermolecular distances and decrease red-shifts in the emission originating from strong dipole–dipole interactions. Therefore, these Pt(II) complexes exhibit little change in emission color with increasing dopant concentration. OLEDs incorporating these new Pt(II) complexes as emitters exhibit deep blue emission with a Commission International de L'Eclairage (CIE) y under 0.13 and a maximum external quantum efficiency of 22.6%, which is one of the highest observed for deep blue (CIE y < 0.15) phosphorescent OLEDs using Pt(II) complexes. These results provide a new approach for designing Pt(II) complexes for high efficiency deep blue OLEDs.     

以ZnO为空穴缓冲层的高效率有机电致发光器件

研制了在传统双层有机电致发光器件(OLED) ITO/NPB/AlQ/Al的阳极与空穴传输层间加入ZnO缓冲层的新型器件.研究了加入缓冲层后对OLED性能的影响,并比较了新型与传统OLED的性能,结果表明,新型器件比传统器件的耐压能力有了显著提高;当电压达到7 V时,发光效率提高了35%.分析认为,ZnO缓冲层的加入,改善了界面, 减少了漏电流,并且阻碍了空穴的注入,有利于改善空穴和电子的注入平衡,提高复合效率.     

Microcavity polymer electroluminescent devices with solution-processed dielectric distributed Bragg reflectors utilizing inorganic copper (I) thiocyanate and insulating polymers

The concept of using printed inorganic/organic hybrid distributed Bragg reflectors (DBRs) utilizing inorganic semiconductor and insulating polymers in microcavity polymer electroluminescent devices is introduced to provide an approach to achieve the spectral narrowing and the strong forward directionality. The large refractive index contrast of approximately 0.5 (0.44) between inorganic copper(I) thiocyanate, CuSCN, and insulating polymer of poly(vinylidene fluoride-trifluoroethylene), P(VDF-TrFE) (cellulose acetate, CA) results in the fabrication of solution-processed inorganic-organic hybrid dielectric DBRs with high reflectivity (>90%) from nanostructures consisting of only four (five) bilayers. For DBRs composed of CuSCN/CA alternative dielectric layers, all-solution processed microcavity polymer light-emitting diode based on highly conductive poly(ethylenedioxythiophene):poly(styrenesulfonate) anode except for Ag cathode exhibits the narrowing of EL spectrum with a full width at half maximum of approximately 25 nm and the maximum luminance of above 10,000 cd/m². From the viewpoint of dielectric DBRs based on ferroelectric polymer P(VDF-TrFE) with both low refractivity and high permittivity, we demonstrate a microcavity AC voltage-driven polymer electroluminescent device (μcACEL) which exhibits the spectral narrowing and the strong forward directionality. This work is anticipated to be useful for the development of solution-processed μcACEL with unique device architecture.     

Progress on benzimidazole-based iridium(III) complexes for application in phosphorescent OLEDs

Benzimidazole-based iridium (III) [Ir(III)] complexes as emissive phosphors in organic light-emitting diodes (OLEDs) have received extensive investigation due to their good electron mobility, excellent thermal stability and flexible modification ability. In this overview, recent advance of benzimidazole-based Ir(III) complexes have been reviewed with focus on the design strategies, photophysical properties and EL performances of phosphorescent OLEDs with various benzimidazole derivatives including substituents, functionalized ancillary ligand and dendrimers.     

Rationalizing Fabrication and Design Toward Highly Efficient and Stable Blue Light‐Emitting Electrochemical Cells Based on NHC Copper(I) Complexes

Recently, the use of a new family of electroluminescent copper(I) complexes—i.e., the archetypal [Cu(IPr)(3‐Medpa)][PF₆] complex; IPr: 1,3‐bis‐(2,6‐di‐iso‐propylphenyl)imidazole‐2‐ylidene; 3‐Medpa: 2,2′‐bis‐(3‐methylpyridyl)amine—has led to blue light‐emitting electrochemical cells (LECs) featuring luminances of 20 cd m^?2, stabilities of 4 mJ, and efficiencies of 0.17 cd A^?1. Herein, this study rationalizes how to enhance these figures‐of‐merit optimizing both device fabrication and design. On one hand, a comprehensive spectroscopic and electrochemical study reveals the degradation of this novel emitter in common solvents used for LEC fabrication, as well as the impact on the photoluminescence features of thin‐films. On the other hand, spectro‐electrochemical and electrochemical impedance spectroscopy assays suggest that the device performance is strongly limited by the irreversible formation of oxidized species that mainly act as carrier trappers and luminance quenchers. Based on all of the aforementioned, device optimization was realized using ionic additives and a hole transporter either as a host–guest or as a multilayered architecture approach to decouple hole/electron injection. The latter significantly enhances the LEC performance, reaching luminances of 160 cd m^?2, stabilities of 32.7 mJ, and efficiencies of 1.2 cd A^?1. Overall, this work highlights the need of optimizing both device fabrication and design toward highly efficient and stable LECs based on cationic copper(I) complexes.     

有机量子阱结构发光器件的研究进展

有机电致发光器件自从C.W.Tang等发表了高效、高亮度双层结构器件以来,因其工艺简单、成本低、直流低压驱动,并且可制成大面积的平板显示而成为当前显示器件研究的热点[1-4]。Forrest等人提出的有机多层量子阱结构的概念应用到了有机电致发光器件（OLEDs）中,进而提高了有机电致发光器件的性能,引起了学者们的研究热情。文章将这种结构器件的研究情况给予综述,从结构的应用、工作原理、优缺点和应用前景方面予以展望。     

High Performance NIR OLEDs with Low Efficiency Roll-Off by Leveraging Os(II) Phosphors and Exciplex Co-Host

Near-infrared (NIR) organic-light emitting devices (OLEDs) with high radiance are useful for applications including invisible marking, communication, and biomedical imaging. However, performances of NIR OLEDs are typically limited by their severe efficiency roll-offs at high current density. Herein, three isoquinolinyl azolate based Os(II) complexes (Isq-1–3) with short radiative decay lifetime (in hundreds of ns), and photoluminescence with peak wavelengths > 745 nm and quantum yield up to 48% as doped thin films, are reported. Upon concomitant employment of exciplex-forming co-host (tris(4-carbazoyl-9-ylphenyl)amine and 2,4,6-tris(biphenyl-3-yl)-1,3,5-triazine), efficiency roll-off is greatly reduced, giving external quantum efficiency of 9.66% at a current density of 300 mA cm⁻². A maximum radiance over 170 W sr⁻¹ m⁻² is also achieved in devices based on Isq-2 and Isq-3.     

白光有机电致发光器件最新研究进展

最近白光有机电致发光二极管(White organic light-emitting diode,WOLED)的研究和应用取得了长足的发展.由于WOLED本身无可比拟的优点,用于全色彩有机电致发光显示、照明光源以及液晶显示器的背光源.根据白光器件的不同结构,综述了WOLED最新研究进展,探讨了其中的优缺点,总结了WOLED最新应用成果,并提出了发展高效、稳定的白光器件的新思路.     

系列稀土配合物Re_(1-x)Tb_x(TTFA)_3Phen的合成及光学性能研究

合成了以TTFA、1,10-Phen为第一和第二配体的系列铕和钐、铽(用Re表示钐、铕)双核稀土有机配合物Re11-xTbx(TTFA)3Phen,测试了不同掺杂浓度的各个配合物的紫外吸收光谱和荧光光谱.由紫外吸收光谱可以看出,稀土有机配合物的吸收峰主要来自有机配体.讨论了配合物的传能机理.荧光光谱表明,铽离子对钐离子有敏化效应,铽离子对铕离子有强烈的敏化效应.     

Triplet Exciton Confinement in Green Organic Light‐Emitting Diodes Containing Luminescent Charge‐Transfer Cu(I) Complexes

The temperature dependence of luminescence from [Cu(dnbp)(DPEPhos)]BF₄ (dnbp = 2,9‐di‐n‐butylphenanthroline, DPEPhos = bis[2‐(diphenylphosphino)phenyl]ether) in a poly(methyl methacrylate) (PMMA) film indicates the presence of long‐life green emission arising from two thermally equilibrated charge transfer (CT) excited states and one non‐equilibrated triplet ligand center (³LC) excited state. At room temperature, the lower triplet CT state is found to be the predominantly populated excited state, and the zero‐zero energy of this state is found to be 2.72 eV from the onset of its emission at 80 K. The tunable emission maximum of [Cu(dnbp)(DPEPhos)]BF₄ in various hosts with different triplet energies is explained in terms of the multiple triplet energy levels of this complex in amorphous films. Using the high triplet energy charge transport material as a host and an exciton‐blocking layer (EBL), a [Cu(dnbp)(DPEPhos)]BF₄ based organic light‐emitting diode (OLED) achieves a high external quantum efficiency (EQE) of 15.0%, which is comparable to values for similar devices based on Ir(ppy)₃ and FIrpic. The photoluminescence (PL) and electroluminescence (EL) performance of green emissive [Cu(μI)dppb]₂ (dppb = 1,2‐bis[diphenylphosphino]benzene) in organic semiconductor films confirmed its ³CT state with a zero‐zero energy of 2.76 eV as the predominant population excited state.