Small molecular phosphorescent organic light-emitting diodes using a spin-coated hole blocking layer

摘要：

Small molecular green phosphorescent organic lightemitting diodes OLEDs have been studied using a solution processed polyethyleneoxide (PEO) hole blocking layer(HBL) and a Cs2CO3/Al cathode. PEO is soluable in alcoholic solvents and allows the fabrication of multilayer OLEDs by successive spincoating. The current efficiency of the optimized OLED increases from 18.8 cd/A to 32.1 cd/A and the tum-on voltage reduces from 4.8 V to 3.4 V, compared with the device without the PEO HBL. Photovoltaic measurements indicate that injection barrier for electron is reduced by insertion of the PEO layer. XPS measurements further reveal that improvement in device performance is due to the partial penetration of Cs into the PEO layer.

关键词： Small molecular OLED Multilayer device structure Wet processing Green phosphorescent Hole blocking layer

作者: Shu Feng Lian Duan Liudong Hou Juan Qiao Deqiang Zhang Guifang Dong Liduo Wang Yong Qiu

作者单位: Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education,Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China

会议类型: 国际会议

会议名称: China Display/Asia Display 2011(2011年中国显示/亚洲显示会议)

会议地点: 江苏昆山

会议语种:英文

页码: 507-508

在线出版日期: 2011-11-07（万方平台首次上网日期，不代表论文的发表时间）