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有机电致发光器件(OLED)是在电场作用下,以有机材料为活性发光层的器件。由于OLED具有亮度高、响应快、视角宽、工艺简单、可柔性等优点,在现代科学研究及技术应用中备受关注。其商业化应用,诸如平板显示(FPD)和固体照明(SSL)等,正在不断向前推进。本文综述了小分子OLED的各种器件结构和功能材料研究进展以及该领域存在的问题和挑战。在器件结构方面,着重介绍了每种器件的结构及相关工作原理、并对其性能进行讨论。包括:掺杂或主体发光器件;单层、双层、三层及多层器件;白光器件。继而介绍了OLED功能材料的一般研究方法,OLED中典型功能材料的结构和特点,以及器件性能。这些功能材料包括:空穴传输、电子传输、红光、绿光、蓝光、掺杂磷光的主体、界面修饰等材料。文章最后提出了小分子有机电致发光器件在技术方面存在的主要问题和挑战,并对其未来发展方向做了简单讨论。
Organic electroluminescent devices (OLEDs) are devices that use an organic material as the active light-emitting layer under the action of an electric field. Because OLED has the advantages of high brightness, fast response, wide viewing angle, simple process, flexibility and so on, it attracts much attention in modern scientific research and technology application. Its commercial applications, such as flat panel display (FPD) and solid-state lighting (SSL), are continuing to move forward. This article reviews the research progress of various device structures and functional materials for small molecule OLEDs and the problems and challenges in this field. In terms of device structure, the structure and related working principle of each device are emphatically introduced, and the performance is discussed. Including: doped or the main light-emitting devices; single-layer, double-layer, three-layer and multi-layer devices; white light devices. Then the general research methods of OLED functional materials, the structure and characteristics of typical functional materials in OLED, and the device performance are introduced. These functional materials include: hole transport, electron transport, red, green, blue, phosphorescent host, interface modification and other materials. Finally, the paper presents the main problems and challenges of small molecule organic electroluminescent devices in terms of technology, and makes a brief discussion on their future development.