2005亚洲信息电子展(CeBIT)巡礼

亚洲公司首次占据了以前属于欧洲公司的位置，主导了显示器展厅，而有些欧洲公司缺席了今年的展览。     

新一代OLED显示技术

本文介绍了OLED的发展，分析了OLED的结构、工艺和巨大优势，预测了OLED市场的未来。     

柔性显示实现的关键技术

对现阶段可以实现柔性显示的几种关键技术(有机电致发光器件显示、液晶显示与电泳显示等)的显示原理、研究现况与成果及实现柔性显示的技术瓶颈进行了介绍,并对国内柔性显示技术的研究方向提出了建议。     

基于ADN的非掺杂高效蓝色OLED器件

采用真空蒸镀的方法,制备了以ADN为发光层的高效率非掺杂蓝色有机电致发光器件.器件的结构为ITO/2T-NATA(15 nm)/NPBx(15 nm)/ADN(25+d nm)/BCP(8 nm)/ Alq_3(30 nm)/LiF(0.5 nm)/Al.通过调整ADN层的厚度,研究了器件的发光性能.测试结果表明,器件在6 V电压时电流效率达到最大,为2.77 cd/A;在16 V时亮度达到最大,为7 227 cd/m~2.当ADN的厚度为30 nm、器件的电压从5 V变化到16 V时,色坐标在(0.21,0.32)至(0.19,0.29)之间,均在蓝光区域.

Abstract：

Using ADN as the emitting layer, high efficient undoped blue organic light-emitting diodes(OLEDs) with a typical structure of (ITO)/ 2T-NATA(15 nm)/ NPBx(15 nm)/ ADN(25+d nm)/BCP(8 nm)/Alq_3 (30 nm)/LiF(0.5 nm)/Al were fabricated via thermal vacuum deposition method. This device has a maximum luminous efficiency of 2.77 cd/A at 6 V and maximum luminance of 7 227 cd/m~2 at 16 V. The CIE coordinates of the device are within the blue region when the thickness of ADN is 30 nm and the voltage changes among the range of 6～16 V.     

有机/聚合物异质结电致发光器件的光电性能

器件结构是影响有机发光器件(OLED)性能的重要因素之一.采用8-hydroxyquinoline-aluminum(AlQ)作为发光层(EML)和电子传输层(ETL),polyvinylcarbazole (PVK)作为空穴传输层(HTL),制备了具有有机小分子/聚合物异质结结构的OLED器件,通过其电压-电流-发光亮度(V-J-B)特性测试,研究了HTL的引入及其膜厚对器件性能的影响.实验结果表明,HTL的引入有效地改善了OLED的光电性能,同时HTL膜厚对器件性能具有显著影响,当HTL膜厚为20 nm时,所制备的OLED器件具有最小的驱动电压和启亮电压、最大的发光亮度和发光效率.

Abstract：

The device construction plays an important role in improving the optoelectronic performance of organic electroluminescence devices (OLEDs). Heterojunction OLEDs with a configuration of glass/ITO/PVK/AlQ/Mg/Al were fabricated by using 8-hydroxyquinoline-aluminum (AlQ) as the emission layer (EML) and electron transport layer (ETL) and polyvinylcarbazole (PVK) as the hole transport layer (HTL). The effect of the HTL thickness on the performance of OLEDs was investigated with respect to the driving voltage, turn-on voltage, electroluminescence brightness and efficiency of the devices. Experimental results demonstrate that the optical and electrical properies of OLEDs are closely related to the HTL thickness. The device fabricated with the HTL thickness of 20 nm possesses the best photoelectric properties such as the minimum driving voltage and turn-on voltage, and the maximum electroluminescence brightness and efficiency.     

OLED——提升人类视觉享受

与液晶显示器（LCD）相比,有机发光二极管显示器（organic light emitting display,OLED）具有主动发光、广视角、重量轻、厚度小、高亮度、高发光效率、发光材料丰富、易实现彩色显示、响应速度快、动态画面质量高、使用温度范围广、可实现柔软显示、工艺简单、成本低、抗震能力强等一系列优点,因此被专家称为未来的理想显示器。文章介绍了OLED的产生与发展过程,并着重介绍了OLED与目前占主导地位的LCD和等离子显示器（PDP）相比在显示性能和器件制造方面所具有的领先优势。     

Thin-film encapsulation of top-emission organic light-emitting devices with polyurea/Al2O3 hybrid multi-layers

We developed a room-temperature encapsulation process based on multi-stack of ultra thin Al₂O₃ and polyurea layers for top-emission organic light-emitting devices (TEOLEDs). Device structure, including a capping layer for refractive-index matching and a thick polyurea buffer layer, was optimized to enhance light extraction without distorting electroluminescence spectrum. The efficiency of a TEOLED encapsulated with 5 pairs of Al₂O₃(50 nm)/polyurea(20 nm) layers was better than that of a glass-encapsulated TEOLED, whereas their color coordinates were almost identical. Moreover, the half-decay lifetime of a TEOLED encapsulated with 5 pairs of Al₂O₃/polyurea layers was 86% of that of a glass-encapsulated TEOLED. Water vapor transition rate of 5 pairs of Al₂O₃(50 nm)/polyurea(20 nm) layers on PET film was measured as low as 5 × 10⁻⁴ g/m² day.     

Multifunctional Deep‐Blue Emitter Comprising an Anthracene Core and Terminal Triphenylphosphine Oxide Groups

A highly efficient blue‐light emitter, 2‐tert‐butyl‐9,10‐bis[4′‐(diphenyl‐phosphoryl)phenyl]anthracene (POAn) is synthesized, and comprises electron‐deficient triphenylphosphine oxide side groups appended to the 9‐ and 10‐positions of a 2‐tert‐butylanthracene core. This sophisticated anthracene compound possesses a non‐coplanar configuration that results in a decreased tendency to crystallize and weaker intermolecular interactions in the solid state, leading to its pronounced morphological stability and high quantum efficiency. In addition to serving as an electron‐transporting blue‐light‐emitting material, POAn also facilitates electron injection from the Al cathode to itself. Consequently, simple double‐layer devices incorporating POAn as the emitting, electron‐transporting, and ‐injecting material produce bright deep‐blue lights having Commission Internationale de L'Eclairage coordinates of (0.15,0.07). The peak electroluminescence performance was 4.3% (2.9 cd A^?1). For a device lacking an electron‐transport layer or alkali fluoride, this device displays the best performance of any such the deep‐blue organic light‐emitting diodes reported to date.     

The Fluorescence and Electroluminescence Properties of the Carbazole–Phenylazomethine Double Layer-Type Dendrimer

The fluorescence properties of double layer-type dendrimers with carbazole as the outer layer and phenylazomethine as the inner layer of the dendron with a zinc porphyrin core were studied. Based on the fluorescence quantum yield (solution), the effect of the bulky dendron to inhibit the interaction of the chromophores was confirmed. Additionally, the efficient light-harvesting property of the double layer-type dendron was revealed by the fluorescence measurement at several excitation wavelengths. These dendrimers were used as an emitting-layer in an OLED device. The electroluminescence of the core porphyrin was observed and it was shown that the double layer-type dendrimer with a luminescent core has the potential to be a hole-transporting/emitting material.     

大面积OLED照明器件的设计与制作

通过串联加并联相结合的照明结构设计,实现大面积OLED照明器件发光的均匀性,采用厚膜工艺降低颗粒造成的短路失效几率,成功制备了7″OLED照明器件。