Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 694, Issue 17, Pages 2700-2704Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2009.03.040
Keywords
Iridium; Homoleptic dendrimer; Heteroleptic dendrimer; Non-doped device
Categories
Funding
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences [CX07QZJC-24]
- National Natural Science Foundation of China [20474067, 50673088, 50633040, 50803062]
- Science Fund for Creative Research Groups [20621401]
- 973 Project [2009CB623601]
Ask authors/readers for more resources
A series of heteroleptic green iridium dendrimers functionalized with carbazole dendrons, such as G2(pic) and G2(acac), have been synthesized, in which picolinic acid and acetylacetone are used as the ancillary ligands, respectively. Compared with the corresponding homoleptic iridium dendrimer G2 (8%), these heteroleptic ones can be prepared under mild conditions with total yields as high as 55-67%. Both the dendrimer G2(pic) and G2(acac) display bright green emissions with photoluminescence quantum yields higher than 0.80 in toluene solution. As a result, a maximum external quantum efficiency of 7.1% (21.0 cd/A) for G2(pic) and 7.7% (25.8 cd/A) for G2(acac) has been realized based on non-doped device configuration. The state-of-art performance indicates that the heteroleptic dendrimers can be promising candidates used for non-doped electrophosphorescent devices, especially when the ease of synthesis in a large scale is considered. (C) 2009 Elsevier B. V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available