白色有机发光器件及其稳定性

报道了一种稳定的白色有机薄膜电致发光器件.电流效率6cd/A,在电流密度20mA/cm²驱动下,亮度为1026cd/m²;最高亮度21200cd/m²,色度(x=0.32,y=0.40).该器件具有较平稳的效率电流关系,即具有弱的电流荧光猝灭.初始亮度100cd/m²下,半亮度寿命达22245h.     

人体静电放电对有机发光二极管的影响

研究了静电放电（ESD）人体模式（HBM）下的脉冲应力对有机发光二极管（OLED）的性能及寿命的影响,并讨论了相应的物理机制。对比分析了4组OLED在施加ESD放电为0,200,800,1 600 V前后的电学和光学特性,并进行了相应的寿命测试分析。研究发现,OLED器件的光谱对ESD不敏感,随着冲击电压的增大,由于静电打击对载流子的短期抑制效应,OLED的亮度出现轻微下降。在静电冲击电压为200 V和800 V时,伏安特性没有发生变化;当静电冲击电压增至1 600 V时,反向漏电有明显增加。后续的加速寿命实验表明,静电打击对器件的工作寿命没有明显的规律性影响,但是会一定程度提高非本质老化失效的概率。     

光转换有机白光发光二极管发光性能研究

研究一种有机白光发光材料,采用热熔法制备出有机薄膜(核黄素、蒽酮衍生物和线性低密度聚乙烯)。研究结果表明：核黄素、蒽酮衍生物和线性低密度聚乙烯的配比和制膜的加热时间对有机薄膜的发光光谱具有一定影响;得到了从绿光到红光的宽带光谱;用此薄膜封装成白光发光二极管的性能良好。     

超短金属微腔中有机电致发光的三色发射

以典型的有机发光材料Alq3为发光层制作了结构为Glass／Ag/PVK/Alq3／Al的微腔器件。与普通的电致发光器件相比较，研究了腔内模式密度的变化、峰值强度的增强、以及光谱的窄化和峰值波长随探测角度变化而变化等一系列的腔量子电动力学效应。得到了色度较为纯正的三色发光，与无腔器件相比峰值强度增强2—2．5倍，光谱半高宽降低，只有无腔的l／3左右。     

橘红色发光的八羟基喹啉锌和1,4-二乙烯基苯的交替共聚物

经由配位聚合反应,合成了八羟基喹啉锌和1,4二乙烯基苯的交替共聚物.所合成的聚合物通过元素分析和红外光谱进行了表征.在365nm的紫外光照射下,聚合物呈现强的橘红色发光,在乙氰溶液中的最大发光峰位在571nm.热失重分析表明,这种含Znq2的聚合物具有稳定的热力学性质,热失重5%的温度大于439℃.这种聚合物的电致发光性质正在研究中.     

基于MEMS的波长可调谐微腔有机发光二极管的设计

利用MEMS空气腔在静电力作用下的变形,设计了一种波长可调谐的微腔电致有机发光二极管.通过外加电压,可调制发光中心波长.模拟计算了不同电压下的光谱特性,结果表明可以获得半宽度为2.14 nm,可调谐范围为150 nm的发光光谱.这在光互联的可调谐光源和彩色显示中有很好的应用前景.     

n型掺杂PTCDA复合材料对有机发光二极管性能的提高

采用碳酸锂(Li2CO3)为n型掺杂剂,苝四甲酸二酐(3,4,9,10 perylenetetracarboxylic dianhydride,PTCDA)为母体材料,通过真空热蒸发方式制备了n型掺杂的PTCDA复合材料,将其作为电子注入材料应用到NPB/Alq3异质结有机电致发光器件中.研究发现,同LI2CO3:BC...     

新型高色纯度弱电流猝灭性蓝色有机发光器件

以ADN为基质,分别以不同掺杂剂制备了四种蓝色有机发光器件,器件结构为:CuPc(12 nm)/NPB(40 nm)/AND∶Dopant(50 nm)/Alq(12 nm)/LiF(4 nm)/Al。掺杂剂有:BCzVB(amino-substituted distyrylarylenederivatives)、TBPe、BCzVBi和DSA-ph四种。研究了最佳掺杂浓度以及器件的亮度、电流密度、效率和色坐标等电学特性和光学特性。其中掺杂BCzVB制备了色纯度高、低电流猝灭性的蓝色有机发光器件,色坐标达到x=0.146,y=0.162,最大亮度为11600 cd/m2(15 V),电流效率为2.8 cd/A,流明效率为1.79 lm/W;以ADN为基质,分别以TBPe、BCzVBi和DSA-ph为掺杂剂,制备了另外三种对比器件。器件ADN∶TBPe色坐标为x=0.162,y=0.222(蓝绿光),效率随电流的增加而降低很快;器件ADN∶BczVBi有较好的色纯度(色坐标:x=0.164,y=0.146),但电流效率较低:2.03 cd/A,效率随电流的增加降低幅度也较快。器件ADN∶DSA-ph效率较高为8 cd/A,效率随电流增加变化幅度不大,但色纯度比较差(x=0.153,y=0.306),适合于做白色有机发光器件。     

Chemical Analysis of Patterned Mask Cleaning in Organic Light Emitting Diode Fabrication with Raman Spectroscopy

Abstract

Despite the continually improving efficiency of the fabrication process used to manufacture the organic light emitting diode (OLED) emitter layer, which uses a shadow mask, a method for the cleaning and recycling of the shadow mask is still lacking. One of the main reasons for this is the absence of a quantitative/qualitative method to analyze the cleaning solution using simple in situ measurements. Recently, Raman analysis has become popular because of its convenience, ease of use, and suitability for in situ measurements. Thus, Raman spectroscopy has the capacity to analyze the solution used for cleaning shadow masks. A particular advantage of this approach is that it can detect organic contaminants in the cleaning solution, which are caused by the residue that remains on the shadow mask after the OLED emitter layer fabrication process. Raman spectroscopy has an advantage for analyzing solution condition and contaminant detection between the cleaning solution and organic chemical by using the Raman peak and fluorescence integration method.     

基于mCP与UGH2为母体的双发光层高效率蓝色磷光OLED

以9,9'-(1,3-苯基)二-9H-咔唑(m CP)和1,4-二(三苯甲硅烷基)苯(UGH2)为母体,将常用的蓝光染料二(3,5-二氟-2-(2-吡啶)苯基-(2-吡啶甲酸根))合铱(Ⅲ)(FIrpic)掺入这两种母体材料中,制得具有双发光层结构的蓝色磷光有机电致发光器件,并对整个物理机制进行了阐述。该器件较基于m CP或UGH2为母体的单发光层器件有着更高的器件效率。器件的最大电流效率、功率效率、外量子效率分别为21.13 cd/A、14.97 lm/W、10.56%。器件亮度从100 cd/m2到3 000 cd/m2时,效率滚降为34.2%。     

Synthesis,Photoluminescence Behavior of Green Light Emitting Tb(III) Complexes and Mechanistic Investigation of Energy Transfer Process

A series of five new terbium(III) ion complexes with 4,4-difluoro-1-phenylbutane-1,3-dione (HDPBD) and anciliary ligands was synthesized. The composition and properties of complexes were analyzed by elemental analysis, IR, NMR, powder X-ray diffaraction, TG-DTG and photoluminescence spectroscopy. These complexes exhibited ligand sensitized green emission at 546 nm associated with ⁵D₄?→?⁷F₅ transitions of terbium ion in the emission spectra. The photoluminescence study manifested that the organic ligands act as antenna and facilitate the absorbed energy to emitting levels of Tb(III) ion efficiently. The enhanced luminescence intensity and decay time of ternary C2-C5 complexes observed due to synergistic effect of anciliary ligands. The CIE color coordinates of complexes came under the green region of chromaticity diagram. The mechanistic investigation of intramolecular energy transfer in the complexes was discussed in detail. These terbium(III) complexes can be thrivingly used as one of the green component in light emitting material and in display devices.

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Graphical Abstract Illustrate the sensitization process of the Tb ion and intramolecular energy transfer process in the Tb³⁺ complex.

     

双8-羟基喹啉-席夫碱-锌高分子配合物的制备及发光性能

将5－甲酰基－8－羟基喹啉分别与对苯二胺、联苯二胺、4，4′－二氨基二苯砜反应，得到了三种双8－羟基喹啉－席夫碱配体，然后与锌离子配位，制得了一类新型的双8－羟基喹啉－席夫碱－锌高分子配合物。利用红外光谱、紫外可见光谱、元素分析对配体和配合物的结构进行了表征，利用荧光光谱研究了高分子配合物的光致发光性能。     

一种新型的橙红光发射材料聚8-羟基喹啉镓的合成与光谱特性

合成了高分子金属配合物聚8-羟基喹啉镓(Gaqq3)n.利用红外吸收光谱、X射线衍射谱(XRD)研究了配合物的分子结构、物相结构;利用热重(TG)分析研究了配合物的热稳定性;利用紫外吸收光谱、荧光激发和发射光谱研究了该配合物的光物理性能.结果表明:(Gaqq3)n的热分解温度为443.6℃,具有较高的热稳定性.(Gaqq3)n的紫外吸收带位于250～500 nm,存在较强的带尾吸收,表明禁带中存在带隙缺陷态.(Gaqq3).的荧光激发带位于380～456nm,荧光发射峰位于568nm,为橙红光发射.光学带隙2.49 eV.与Gaq3相比,荧光强度有所减弱,这是由于次甲基相连的两个喹啉环的扭曲导致了(Gaqq3)n的刚性和共平面性不好;由于分子共轭体系的增大,使(Gaqq3)n分子的π电子更加离域化,导致了荧光发射峰发生了红移.(Gaqq3)n有望在有机电致发光器件和有机光伏器件中得到应用.     

用于动物细胞和组织培养的新型LED生物光源系列

采用透镜组扩大光束、透镜阵列聚焦和点阵光曲面聚集光能三种光路设计,通过选择各光源中的四个工作参数调节光源输出的辐射照度,本文研制出可用于动物细胞和组织培养使用的、不同强度的三种新型LED生物光源,并使用统计分析软件SPSS拟合得出它们的辐射照度经验计算公式.     

Applicability of Reddish-Orange Light Emitting Samarium (III) Complexes for Biomedical and Multifunctional Optoelectronic Devices

Six crimson samarium (III) complexes based on β-ketone carboxylic acid and ancillary ligands were synthesized by adopting the grinding technique. All synthesized complexes were investigated via elemental analysis, infrared, UV–Vis, NMR, TG/DTG and photoluminescence studies. Optical properties of these photostimulated samarium (III) complexes exhibit reddish-orange luminescence due to ⁴G_5/2?→?⁶H_7/2 electronic transition at 606 nm of samarium (III) ions. Further, energy bandgap, color purity, CIE color coordinates, CCT and quantum yield of all complexes were determined accurately. Replacement of water molecules by ancillary ligands enriched these complexes (S2-S6) with decay time, quantum yield, luminescence, energy bandgap and biological properties than parent complex (S1). Interestingly, these efficient properties of complexes may find their applications in optoelectronics and lighting systems. In addition to these, the antioxidant and antimicrobial assays were also investigated to explore the applications in biological assays.

     

铒有机配合物的合成、表征与近红外发光性能研究

合成了乙酰基丙酮(AcAc)和二苯甲酰基甲烷(DBM)的水合二元铒配合物以及乙酰基丙酮、二苯甲酰基甲烷和三氟乙酰基丙酮(TFA)分别与1,10-邻菲罗啉(Phen)的三元铒配合物,并经元素分析确认;表征了配合物的紫外-可见吸收光谱和红外吸收光谱;探讨了铒配合物的近红外发光性能,并对不同配体对发光性能的影响进行分析比较。结果表明Er(AcAc)₃Phen三元配合物是所研究的几种配合物中近红外发光性能最优的。     

Synthesis, Thermal and Spectroscopic Characterization of Caq2 (Calcium 8-Hydroxyquinoline) Organic Phosphor

Bluish-green photoluminescence from calcium 8-hydroxyquinolate (Caq(2)) powder, synthesized by a co-precipitation route, and a blended Caq(2):PMMA thin film is reported. The film was obtained by mixing the Caq(2) powder with PMMA (Polymethylmethacrylate) in a chloroform solution. X-ray diffraction analyses confirm the formation of the Caq(2) powder and thin film. Further structural elucidation was carried out using Fourier transform infrared spectroscopy (FTIR) in which the stretching frequencies of the Caq(2) bonds were determined. Bluish-green photoluminescence with a maximum at 480?nm was observed from the powder and the emission was red-shift by 10?nm in the case of the thin film. The UV-vis absorption bands were split and shifted due to different orientations of the Caq(2) molecules in both the powder and thin film. It was confirmed by thermogravimetric (TGA) and differential thermal analysis (DTA) that the Caq(2) powder was stable up to?≈?380?°C. Atomic force microscopy images showed the continuous distribution of the Caq(2) atoms in the PMMA thin film. X-ray photoelectron spectroscopy data was used to estimate the binding energies of the chemical bonding in the Caq(2) powder complex. The optical properties of the Caq(2) powder and thin film were evaluated for possible applicable in organic light emitting devices.     

有机电致发光器件量子效率测量系统的建立及其应用研究

有机电致发光器件（OLED）的量子效率是衡量器件发光性能的一个非常重要的参数，考虑到提高OLED量子效应的基本前提是能精确测得器件的量子效率。本文工作采用美国Keithley公司的系列产品，设计与组建了一套精确测量OLED量子效率的测量系统（主要由真空系统和测试系统组成）。应用本系统测量时，由测量软件通过数据采集卡来实时地对K－2400（稳压源）和K－485（微检流计）进行控制，得到流经器件的电流和器件输的光电流，再经过换算得出注入器件的电子数和从器件输出的光子数，从而能够得到器件的量子效率值，最后由计算机动态地绘制出器件的性能曲线。此外，我们还利用本测量系统对以MEH－PPV为基质的橙红色OLED进行测量，该测试样品在0.0117A/cm^2的电流密度下，测量量子效率为0．39％。     

有机金属配合物电致发光材料的研究进展

有机电致发光材料是平板显示领域最有发展前景的材料之一。其中有机配合物应用最早,一般为五元环或六元环结构,性质比较稳定,熔点高,固体荧光效率高,应用十分广泛。将从配体和金属原子发光方面对其近年来在有机EL器件中的应用研究做一综述。     

Activation of Hydrogen-Passivated Mg in GaN-Based Light Emitting Diode Annealing with Minority-Carrier Injection

We discuss an issue on the activation of p-GaN material under different annealing conditions and study the mechanism for the p-GaN activation. Under annealing in nitrogen, it is found that hydrogen cannot be completely removed from p-GaN. The experiments also indicate that rudimental hydrogen can exist stably in a certain state where hydrogen does not passivate the Mg acceptor in the sample annealing under bias. However, making additional annealing in nitrogen, we find that the steady state hydrogen can be decomposed and the Mg-H complex could generate again. Hydrogen remaining in the layer seems to play a major role in this reversible phenomenon.