Tuning the Optoelectronic Properties of Carbazole/Oxadiazole Hybrids through Linkage Modes: Hosts for Highly Efficient Green Electrophosphorescence
文献类型：期刊论文
| 作者 | Tao, Youtian1; Wang, Qiang2; Yang, Chuluo1; Zhong, Cheng1; Zhang, Kai1; Qin, Jingui1; Ma, Dongge2 |
| 刊名 | ADVANCED FUNCTIONAL MATERIALS
 |
| 出版日期 | 2010-01-22 |
| 卷号 | 20期号:2页码:304-311 |
| ISSN号 | 1616-301X |
| DOI | 10.1002/adfm.200901615 |
| 英文摘要 | A series of bipolar transport host materials: 2,5-bis(2-(9H-carbazol-9-yl)phenyl)-1,3,4-oxadiazole (o-CzOXD) (1), 2,5-bis(4-(9H-carbazol-9-yl)phenyl)-1,3,4-oxadiazole (p-CzOXD) (2), 2,5-bis(3-(9H-carbazol-9-yl)phenyl)-1,3,4-oxadiazole (m-CzOXD) (3) and 2-(2-(9H-carbazol-9-yl)phenyl)-5-(4-(9H-carbazol-9-yl)phenyl)-1,3,4-oxadiazole (op-CzOXD) (4) are synthesized through simple aromatic nucleophilic substitution reactions. The incorporation of the oxadiazole moiety greatly improves their morphological stability, with T(d) and T(g) in the range of 428-464 degrees C and 97-133 degrees C, respectively. The ortho and meta positions of the 2,5-diphenyl-1,3,4-oxadiazole linked hybrids (1 and 3) show less intramolecular charge transfer and a higher triplet energy compared to the para-position linked analogue (2). The four compounds exhibit similar LUMO levels (2.55-2.59 eV) to other oxadiazole derivatives, whereas the HOMO levels vary in a range from 5.55 eV to 5.69 eV, depending on the linkage modes. DFT-calculation results indicate that 1, 3, and 4 have almost complete separation of their HOMO and LUMO levels at the hole- and electron-transporting moieties, while 2 exhibits only partial separation of the HOMO and LUMO levels possibly due to intramolecular charge transfer. Phosphorescent organic light-emitting devices fabricated using 1-4 as hosts and a green emitter, Ir(ppy)(3) or (ppy)(2)Ir(acac), as the guest exhibit good to excellent performance. Devices hosted by o-CzOXD (1) achieve maximum current efficiencies (eta(c)) as high as 77.9 cd A(-1) for Ir(ppy)(3) and 64.2 cd A(-1) for (ppy)(2)Ir(acac). The excellent device performance may be attributed to the well-matched energy levels between the host and hole-transport layers, the high triplet energy of the host and the complete spatial separation of HOMO and LUMO energy levels. |
| 语种 | 英语 |
| WOS记录号 | WOS:000274269300016 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/69449]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Tao, Youtian |
| 作者单位 | 1.Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tao, Youtian,Wang, Qiang,Yang, Chuluo,et al. Tuning the Optoelectronic Properties of Carbazole/Oxadiazole Hybrids through Linkage Modes: Hosts for Highly Efficient Green Electrophosphorescence[J]. ADVANCED FUNCTIONAL MATERIALS,2010,20(2):304-311. |
| APA | Tao, Youtian.,Wang, Qiang.,Yang, Chuluo.,Zhong, Cheng.,Zhang, Kai.,...&Ma, Dongge.(2010).Tuning the Optoelectronic Properties of Carbazole/Oxadiazole Hybrids through Linkage Modes: Hosts for Highly Efficient Green Electrophosphorescence.ADVANCED FUNCTIONAL MATERIALS,20(2),304-311. |
| MLA | Tao, Youtian,et al."Tuning the Optoelectronic Properties of Carbazole/Oxadiazole Hybrids through Linkage Modes: Hosts for Highly Efficient Green Electrophosphorescence".ADVANCED FUNCTIONAL MATERIALS 20.2(2010):304-311. |
入库方式： OAI收割
来源：化学研究所
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