摘要
有机电致磷光器件典型双极性主体材料4,4′-N,N′-二咔唑联苯(CBP,4,4′-N,N′-dicarbazolylbiphenyl)中空穴和电子迁移率大小相近,但究竟空穴传输快还是电子传输快是一个有争议的问题。为了比较CBP中空穴和电子传输的相对快慢,本文以CBP为激子产生层,制备了多层结构的发光器件。在CBP层中插入一层超薄磷光发光材料苯基吡啶铱(Ir(ppy)3,fac-tris(2-phenylpyridine)iridium)并改变插入位置得到了不同颜色的发光器件,通过对不同器件发光性能的比较,研究了CBP的双极传输特性。结果表明,在CBP中电子和空穴主要在靠近阳极一侧复合产生激子,从而表明CBP中电子的迁移率大于空穴的迁移率。
The bipolar material 4,4＇-N, N＇-dicarbazolylbiphenyl （CBP） is often used as a typical host materials in electrophosphorescent devices. In order to compare the relative transport speeds of hole and electron in CBP with CBP used as an active layer, electroluminescent （EL） devices with multilayer struc- tures of anode/hole transporting layer/CBP/electron transporting layer/cathode were fabricated. An ultrathin layer of fac-tris（2-phenylpyridine）iridium （Ir（ppy）3） was inserted into CBP layer at different positions to obtain EL devices with different colors. Bipolar transport properties of CBP are investigated by comparing electroluminescences of different devices instead of mobilities of holes and electrons. The results show that the recombination of electrons and holes takes place mainly near the anode side,indicating that electrons move much faster than holes in CBP,or in other words, the mobility of an electron in CBP is greater than that of a hole.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2015年第12期2267-2271,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(11164015
11164016)资助项目
