Synthesis and electroluminescence properties of a carbozole -functionalized Ruthenium complex
Organic light-emitting devices have attracted much attention owing to their potential application for flat-panel color displays. For full color display ， three primary colors ， red ，green and blue ，are desired. How to improve their efficiency and stability are important problems which people study. Since the utilization of triplet excitations in OLEDs was proposed, phosphorescent materials incorporating heavy metal complexes have been used for highly efficient OLEDs. These triplet emitters have the potential of achieving an internal quantum efficiency of 100％, which is three times higher than that of EL devices based on fluorescent materials. Recently, Ruthenium complexes as a new class of triplet emitters in OLEDs have been explored due to their attractive properties including relatively short excited state lifetime, intense phosphorescence emission, high phosphorescent efficiency and excellent stability. Thin film OLEDs usually consist of multiple organic and metallic layers on an ITO-covered glass plate. In this paper, a novel Ruthenium complex, Ru(bpy)2LPF6L=4,4-bis(4-methyphenyl-1,3,4-oxadi azole)-2,2-bipyridinefunctionalized by a carbozole fragment, was synthesized and used as emitting material in organic electroluminescent (EL) devices. Their absorption spectrum ，luminescence properties were studied. The light-emitting units were based on 4,4-bipyridine and oxadiazole derivatives. It was found that the charge carrier mobilities, charge in injection barrier, and the device performance were improved.
Electroluminescence Ruthenium complex Carbazole-functionalized ligand
FAN Wei WANG Binbin LI Bin XIE Demin
Institute of Chemical and environmental Engineering, Changchun Univ of Sci & Tech, 7089 Weixing RD, Department of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
国际会议
北京
英文
2007-08-05（万方平台首次上网日期，不代表论文的发表时间）