Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (06): 1351-1356.doi: 10.3866/PKU.WHXB201303281

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Synthesis and Photoelectric Properties of a New Phosphorescent Host Material Based on Carbazole

YANG Ting-Ting1,2, XU Hui-Xia1,2, WANG Hua1,2, MIAO Yan-Qin1,2, DU Xiao-Gang1,2, JING Shu1,2, XU Bing-She1,2   

  1. 1 Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China;
    2 Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, P. R. China
  • Received:2012-10-22 Revised:2013-03-28 Published:2013-05-17
  • Supported by:

    The project was supported by the Program for Changjiang Scholar and Innovation Research Team in University, China (IRT0972), International Science & Technology Cooperation Program of China (2012DFR50460), National Natural Science Foundation of China (21071108, 60976018, 21101111, 61274056, 61205179), Natural Science Foundation of Shanxi Province, China (2010021023-2, 2011021022-2), Key Scientific and Technological Project of Shanxi Province, China (20120321019).

Abstract:

A new phosphorescent host material based on 9-[6-(9H-carbazol-9-yl)hexyl]-9H-carbazole (hCP) was designed and synthesized and its structure and properties were characterized. These investigations indicated that hCP possessed a twisted rigid structure, with the two carbazole units in a non-coplanar conformation leading to a higher triplet energy level (3.01 eV). hCP also possessed a high glass transition temperature (93℃). Electroluminescent devices were fabricated by doping the hCP host with the green- phosphorescent fac-tris(2-phenylpyridine)iridium(III) (Ir(ppy)3) as the light-emitting layer. Compared with devices employing the typical (4,4'-N,N'-dicarbazole)biphenyl) (CBP) as a host, the hCP host showed a 34.8% increase of current efficiency to 15.1 cd·A-1.

Key words: Carbazole, Phosphorescence organic light emitting device, Host material

MSC2000: 

  • O644