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 YT ; Wang Q ; Yang CL ; Zhong C ; Zhang K ; Qin JG ; Ma DG |
| 刊名 | advanced functional materials
 |
| 出版日期 | 2010 |
| 卷号 | 20期号:2页码:304-311 |
| 关键词 | LIGHT-EMITTING-DIODES BLUE ORGANIC ELECTROPHOSPHORESCENCE RED PHOSPHORESCENT OLEDS BIPOLAR HOST ULLMANN CONDENSATION IRIDIUM COMPLEXES DEVICES TRANSPORT ELECTROLUMINESCENCE LAYER |
| ISSN号 | 1616-301x |
| 通讯作者 | tao yt |
| 中文摘要 | 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. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000274269300016 |
| 公开日期 | 2012-06-07 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/43950]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Tao YT,Wang Q,Yang CL,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 YT.,Wang Q.,Yang CL.,Zhong C.,Zhang K.,...&Ma DG.(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 YT,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：长春应用化学研究所
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