Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices
文献类型：期刊论文
| 作者 | Chen, Lingcheng1,2; Ding, Junqiao1; Cheng, Yanxiang1; Xie, Zhiyuan1; Wang, Lixiang1; Jing, Xiabin1; Wang, Fosong1 |
| 刊名 | CHEMISTRY-AN ASIAN JOURNAL
 |
| 出版日期 | 2011-06-06 |
| 卷号 | 6期号:6页码:1372-1380 |
| 关键词 | Bipolar Dendrimers Iridium Nondoped Devices Heteroleptic Ligands |
| ISSN号 | 1861-4728 |
| DOI | 10.1002/asia.201100016 |
| 英文摘要 | Bipolar heteroleptic green light-emitting iridium (Ir) dendrimers G(OXD) and G(DOXD) have been designed and synthesized under mild conditions in high yields, in which the first C boolean AND N and second O boolean AND O ligands are functionalized with oligocarbazole- and oxadiazole-based dendrons, respectively. To avoid affecting the optical properties of the emissive iridium core, all the functional moieties are attached to the ligands through a flexible spacer. Compared with the unipolar dendrimer G(acac), dendrimers G(OXD) and G(DOXD) exhibit the close emission maxima of 511-512 nm and photoluminescence quantum yield of 0.39-0.40 in a solution of toluene. Moreover, on going from G(acac) to G(OXD) and G(DOXD), we have found that the introduction of oxadiazole fragments decreases the lowest unoccupied molecular orbital (LUMO) energy levels to facilitate the electron injection and electron transporting, while their highest occupied molecular orbital (HOMO) energy levels remain unchanged. This means that, we can individually tune the HOMO and LUMO energy levels based on the heteroleptic structure to ensure the relative independence between the hole and electron in the emitting layer (EML), which is a favorable feature for bipolar optoelectronic materials. As a result, a bilayer nondoped electrophosphorescent device with G(DOXD) as the EML gives a maximum luminous efficiency of 25.5 cd A(-1) (eta(ext): 7.4%) and a brightness of 33 880 cd m(-2). In comparison to G(acac) (17.2 cd A(-1), 17 680 cd m(-2)), both the efficiency and brightness are improved by about 1.5 and 2 times, respectively. These state-of-the-art performances indicate the potential of these bipolar heteroleptic iridium dendrimers as solution-processible emitting materials for nondoped device applications. |
| 语种 | 英语 |
| WOS记录号 | WOS:000292097700014 |
| 出版者 | WILEY-BLACKWELL |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/71889]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Ding, Junqiao |
| 作者单位 | 1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Lingcheng,Ding, Junqiao,Cheng, Yanxiang,et al. Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices[J]. CHEMISTRY-AN ASIAN JOURNAL,2011,6(6):1372-1380. |
| APA | Chen, Lingcheng.,Ding, Junqiao.,Cheng, Yanxiang.,Xie, Zhiyuan.,Wang, Lixiang.,...&Wang, Fosong.(2011).Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices.CHEMISTRY-AN ASIAN JOURNAL,6(6),1372-1380. |
| MLA | Chen, Lingcheng,et al."Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices".CHEMISTRY-AN ASIAN JOURNAL 6.6(2011):1372-1380. |
入库方式： OAI收割
来源：化学研究所
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