三(8-羟基喹啉)铝(Alq3)发光性能的调控

三(8-羟基喹啉)铝(Alq3)是有机电致发光器件的基础材料.本文评述了如何通过分子的化学修饰和聚集态结构的改变来调控其发光光谱,提高发光效率.这将为开发高性能的有机电致发光材料及器件提供参考与依据.     

8-羟基喹啉类配体及其配合物应用研究

8-羟基喹啉类配体及其配合物在分析化学中有着广泛的应用,用作电致发光材料是近年来较热门的研究课题.以8-羟基喹啉为核心,较详细地评述了近10年来8-羟基喹啉类有机分析试剂在光度分析中应用的最新进展及研究现状,较全面地概述了8-羟基喹啉类发光材料的最新研究进展及在有机电致发光器件中的应用.     

8-羟基喹啉铝的老化研究

8－羟基喹啉铝（Alq3）是一种非常重要的电致发光材料，无论是从基础理论研究的观点来看，还是就其应用价值而言，均引起人们的极大关注。本文综述了Alq3的老化机理，分析了影响Alq3老化的主要因素，并对防止Alq3老化方法进行了简单介绍。     

基于新型红色材料的有机发光二极管

对一种名为N，N－双－[4-2-(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ITO／CuPc/DPPP/BDCM/Mg:Ag的红色薄膜电致发光器件，在外加19V直流电压时达到582cd/m^2的发光亮度，同时，此器件的发光色度具有不随所加电流密度变化而改变的特点，表明此材料有很好的电子传输和红色发射性能。     

有机超晶格结构的制备及其量子阱结构电致发光器件

利用高真空多源型有机分子沉积系统制备了由８－羟基喹啉铝（Ａｌｑ３）和叔丁基联苯基呃二唑（ＰＢＤ）交替生长的有机超晶格结构，小角Ｘ射线衍射分析表明，有机超晶格结构具有良好的、完整的周期性结构，并且界面质量很好。从光致发光及电致发光测量中发现，对于由以上两种材料制备的有机量子阱结构，激发态能量随着Ａｌｑ３层厚度的变薄发生了向高能方向移动。电致发光测量中也发现谱线在室温下有窄化现象。     

聚喹啉铝发光特性的研究

研究了由聚喹啉铝的乙醇或氯仿溶液制备的两种薄膜发光光谱及共电致光谱。通过比较两种薄膜及其它喹啉金属配合物的光致光谱,认为这些材料发光主要来自单个喹啉,喹啉基团间的相互作用影响了喹啉基团上共轭电子的离域程度,对光谱有调节作用。聚喹啉铝中的柔性碳链和氢键产生较大位阻,能影响喹啉基团的相互作用,这是导致聚喹啉铝（Ｐａｌｑ）发光光谱相对喹啉铝蓝移的主要原因。     

有机电致发光材料8-羟基喹啉类研究进展

综述了近年来8-羟基喹啉类有机电致发光材料的研究进展,重点讲述在8-羟基喹啉的2、5和7位引入不同基团对其发光的影响,总结了在此领域的实验与研究成果,并探讨其未来前景及研究方向。     

有机电致发光发射材料用金属络合物研究

金属有机络合物在分析化学中有着广泛的应用。而用做发光材料还是近些年才开始的。有机电致发光（ＥＬ）材料从分子结构上区分可分为（１）有机色素（２）螯今型金属络合物（３）有机高分子，其中ＥＬ发光性能最好的则是Ａｌ￣（３＋）－８－羟基喹啉的络合物，基于这种观点本文系统地评述了螯今型金属络合物如何满足有机ＥＬ器件要求及近年来用各种金属络合物研制出的有机ＥＬ器件的进展     

8-羟基喹啉铝表面包覆SiO2的研究

以有机电致发光材料-8-羟基喹啉铝(Alq3)为研究对象,在其表面包覆SiO2来改善有机电致发光器件中的材料界面,从而延长器件寿命.利用透射电子显微镜、光致发光光谱、热重分析分别对产物的形貌、发光性能和热稳定性进行了表征,借助扫描电镜和X射线光电子能谱仪对产物的薄膜进行了微观分析,分别以Alq3和包覆了SiO2的Alq...     

树枝状8-羟基喹啉锌的合成和荧光性能研究

通过收敛法合成了2种不同树枝状8-羟基喹啉配体，产物通过核磁共振（NMR）和红外（IR）进行表征；并通过荧光光谱对树枝状8-羟基喹啉配体及Zn（Ⅱ）金属配合物的性能进行研究，结果表明这些配体和Zn（Ⅱ）配合物均能溶于常见的溶剂，树枝状修饰使荧光强度变大，树枝状结构的外围官能团影响荧光性质；树枝状8-羟基喹啉锌的荧光出现明显的红移，有望在有机电致发光材料领域中得到广泛应用。     

白光LED用BaMgAl_(10)O_(17):Eu~(2+)Mn~(2+)蓝绿荧光粉

采用高温固相法制备出一种Eu2+,Mn2+共掺的蓝绿色荧光粉BaMgAl10O17:Eu2+,Mn2+(BAM:Eu2+,Mn2+),对其进行了X射线衍射分析和光谱特性的测试.研究表明,它的发射光谱为双峰结构,峰值分别位于455 nm和525 nm处.455 nm发射峰归结为BAM中部分取代Ba2+离子的Eu2+离子的5d→4f的跃迁辐射;525 nm的发射峰源于部分Eu2+能量传递给Mn2+离子,Mn2+的4T1→6A1的跃迁辐射.采用近紫外LED芯片与该荧光粉以及一种红色荧光粉Ca(La0.5Eu0.5)4Si3O13封装,在20 mA前向电流驱动下,获得了显色指数为88的白光LED.     

白光LED用单一基质白光荧光粉的研究进展

白光LED以其独特优势被称为第四代光源,具有广阔的应用前景。单一基质白光荧光粉(SMWP)因颜色稳定、色彩还原性好,成为白光LED用光转换材料的研究热点。概述了由近紫外LED芯片激发的白光荧光粉的研究现状,指出了该荧光粉存在的问题并对其发展趋势做了展望。     

Degradation Mechanisms in Small‐Molecule and Polymer Organic Light‐Emitting Diodes

Degradation in organic light‐emitting diodes (OLEDs) is a complex problem. Depending upon the materials and the device architectures used, the degradation mechanism can be very different. In this Progress Report, using examples in both small molecule and polymer OLEDs, the different degradation mechanisms in two types of devices are examined. Some of the extrinsic and intrinsic degradation mechanisms in OLEDs are reviewed, and recent work on degradation studies of both small‐molecule and polymer OLEDs is presented. For small‐molecule OLEDs, the operational degradation of exemplary fluorescent devices is dominated by chemical transformations in the vicinity of the recombination zone. The accumulation of degradation products results in coupled phenomena of luminance‐efficiency loss and operating‐voltage rise. For polymer OLEDs, it is shown how the charge‐transport and injection properties affect the device lifetime. Further, it is shown how the charge balance is controlled by interlayers at the anode contact, and their effects on the device lifetime are discussed.     

OLEDs: Degradation Mechanisms in Small‐Molecule and Polymer Organic Light‐Emitting Diodes (Adv. Mater. 34/2010)

Degradation in organic light‐emitting diodes (OLEDs) is a complex problem. Depending upon the materials and the device architectures used, the degradation mechanism can be very different. In this Progress Report, using examples in both small molecule and polymer OLEDs, the different degradation mechanisms in two types of devices are examined. Some of the extrinsic and intrinsic degradation mechanisms in OLEDs are reviewed, and recent work on degradation studies of both small‐molecule and polymer OLEDs is presented. For small‐molecule OLEDs, the operational degradation of exemplary fluorescent devices is dominated by chemical transformations in the vicinity of the recombination zone. The accumulation of degradation products results in coupled phenomena of luminance‐efficiency loss and operating‐voltage rise. For polymer OLEDs, it is shown how the charge‐transport and injection properties affect the device lifetime. Further, it is shown how the charge balance is controlled by interlayers at the anode contact, and their effects on the device lifetime are discussed.     

Recent Advances in White Organic Light‐Emitting Materials and Devices (WOLEDs)

WOLEDs offer new design opportunities in practical solid‐state lighting and could play a significant role in reducing global energy consumption. Obtaining white light from organic LEDs is a considerable challenge. Alongside the development of new materials with improved color stability and balanced charge transport properties, major issues involve the fabrication of large‐area devices and the development of low‐cost manufacturing technology. This Review will describe the types of materials (small molecules and polymers) that have been used to fabricate WOLEDs. A range of device architectures are presented and appraised.     

Randomly Disassembled Nanostructure for Wide Angle Light Extraction of Top-Emitting Quantum Dot Light-Emitting Diodes

The quantum dot light-emitting diode (QLED) represents one of the strongest display technologies and has unique advantages like a shallow emission spectrum and superior performance based on the cumulative studies of state-of-the-art quantum dot (QD) synthesis and interfacial engineering. However, research on managing the device's light extraction has been lacking compared to the conventional LED field. Moreover, relevant studies on top-emitting QLEDs (TE-QLEDs) have been severely lacking compared to bottom-emitting QLEDs (BE-QLEDs). This paper demonstrates a novel light extraction structure called the randomly disassembled nanostructure (RaDiNa). The RaDiNa is formed by detaching polydimethylsiloxane (PDMS) film from a ZnO nanorod (ZnO NR) layer and laying it on top of the TE-QLED. The RaDiNa-attached TE-QLED shows significantly widened angular-dependent electroluminescence (EL) intensities over the pristine TE-QLED, confirming the effective light extraction capability of the RaDiNa layer. Consequently, the optimized RaDiNa-attached TE-QLED achieves enhanced external quantum efficiency (EQE) over the reference device by 60%. For systematic analyses, current–voltage–luminance (J–V–L) characteristics are investigated using scanning electron microscopy (SEM) and optical simulation based on COMSOL Multiphysics. It is believed that this study's results provide essential information for the commercialization of TE-QLEDs.     

有机电致发光显示中国专利态势分析

利用Thomson data analyzer及中外专利数据库服务平台等工具,从专利类型分布、专利数量年度分布、国家/地区分布等方面分析了在我国申请的有机电致发光显示专利,特别是从法律状态方面进行了较为深入的分析,揭示了有机电致发光显示技术在我国的整体发展态势。     

Purely Organic Thermally Activated Delayed Fluorescence Materials for Organic Light‐Emitting Diodes

The design of thermally activated delayed fluorescence (TADF) materials both as emitters and as hosts is an exploding area of research. The replacement of phosphorescent metal complexes with inexpensive organic compounds in electroluminescent (EL) devices that demonstrate comparable performance metrics is paradigm shifting, as these new materials offer the possibility of developing low‐cost lighting and displays. Here, a comprehensive review of TADF materials is presented, with a focus on linking their optoelectronic behavior with the performance of the organic light‐emitting diode (OLED) and related EL devices. TADF emitters are cross‐compared within specific color ranges, with a focus on blue, green–yellow, orange–red, and white OLEDs. Organic small‐molecule, dendrimer, polymer, and exciplex emitters are all discussed within this review, as is their use as host materials. Correlations are provided between the structure of the TADF materials and their optoelectronic properties. The success of TADF materials has ushered in the next generation of OLEDs.