摘要
研究了采用薄层WO3作为叠层有机发光器件电荷产生层时的性能并对其厚度进行了优化,器件的电荷产生层由Li掺杂的电子注入层和高透明的WO3组成。研究表明,薄层WO3具有很高的透明度,并能有效地产生和注入空穴。叠层器件性能与单发光单元器件相比较,其亮度及效率均有大幅提高,叠层器件的最大电流效率达到了4.2cd/A,在相同的电流密度下,叠层器件的效率约为传统器件的2倍;同时,电荷产生层的性能与WO3薄膜厚度密切相关,WO3薄膜厚度为3nm时,器件的效率在整个电流范围内都保持稳定。采用薄层WO3作为电荷产生层为制备高效叠层有机发光器件提供了一条有效的途径。
A novel tandem organic light-emitting device （OLED） was demonstrated employing WO3 thin film as charge generation layer and its thickness was optimized. The charge generation region consists of a Lidoped electron transport layer and a highly transparent WO3 thin film. The charge generation layer of WO3 with high transmittance can generate electrons on one side and holes on the other side efficiently. Highly efficient emission was obtained from the tandem device. The maximum luminous efficiency of 4.2 cd/A is obtained. The luminous efficiency of tandem device is about two times greater than that of single-layer device. The experimental results also show that optical and electrical properties of the devices are closely related to the thickness of WO3 thin film, and the device with WO3 layer thickness of 3 nm has the best performances. It is indicated that WO3 thin film is an effective intermediate layer for highly efficient tandem organic light-emitting devices.
出处
《半导体技术》
CAS
CSCD
北大核心
2009年第5期405-407,共3页
Semiconductor Technology
基金
国家自然科学基金(90202034、60477014、60577041)
中国矿业大学校青年科研基金(2007A051)
关键词
有机发光器件
电荷产生层
叠层
薄层
organic light-emitting device
charge generation layer
tandem
thin film
