新型TPBI/Ag阴极结构的红色有机发光二极管  

Organic red light-emitting diodes with a soluble luminescent compound and a novel TPBI/Ag cathode

作　　者：李春[1] 彭俊彪[1] 曾文进[1] 

机构地区：[1]华南理工大学高分子光电材料与器件研究所,特种功能材料教育部重点实验室,广州510640

出　　处：《物理学报》2009年第3期1992-1996,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50573024;U0634003);国家重点基础研究发展计划(973)项目(批准号:2009CB623604)资助的课题~~

摘　　要：采用可溶液加工的小分子红光材料2为发光层(EML),制备了不同阴极结构的系列电致发光器件.结果表明,空穴阻挡层(HBL)TPBI的引入能有效降低高功函数(Al,Ag,Au)金属阴极的电子注入势垒,显著改善器件发光效率.与传统阴极结构(Ba/Al)比较,采用TPBI/Ag阴极结构的器件外量子效率提高了57%,主要原因是TPBI/Ag阴极界面形成较低的电子注入势垒,有利于电子注入,使器件发光效率明显提高.Soluble small red molecule No. 2 was introduced as the emitter for light-emitting diodes （PLED） with different cathodes. N-arylbenzinmidzoles （TPBI） was used as hole-blocking layer （HBL） to lower cathode barrier and facilitate electron injection.With TPBI/Ag cathode,the quantum efficiency was increased by 57%.The reason for the efficiency increase is that interfacial dipole layer was formed at the interface between TPBI and Ag,and possibly coordinated reaction between Ag and N atom in TPBI leads to a superior contact between TPBI/Ag.

关 键 词：电致发光 电子注入 阻挡层 高功函数金属阴极 

分 类 号：TN312.8[电子电信—物理电子学]