Employing similar to 100% Excitons in OLEDs by Utilizing a Fluorescent Molecule with Hybridized Local and ChargeTransfer Excited State
文献类型：期刊论文
| 作者 | Li, Weijun1; Pan, Yuyu1; Xiao, Ran1; Peng, Qiming1; Zhang, Shitong1; Ma, Dongge1,2; Li, Feng1; Shen, Fangzhong1; Wang, Yinghui1; Yang, Bing1 |
| 刊名 | ADVANCED FUNCTIONAL MATERIALS
 |
| 出版日期 | 2014-03-01 |
| 卷号 | 24期号:11页码:1609-1614 |
| 关键词 | Ct States Hybrid Electronic States High Singlet Ratios Risc Oleds |
| ISSN号 | 1616-301X |
| DOI | 10.1002/adfm.201301750 |
| 英文摘要 | In principle, the ratio (phi) of the maximum quantum efficiencies for electroluminescence (EL) to photoluminescence (PL) can be expected to approach unity, if the exciton (bound electron-hole pair) generated from the recombination of injected electrons and holes in OLEDs has a sufficiently weak binding energy. However, seldom are examples of phi > 25% reported in OLEDs because of the strongly bound excitons for most organic semiconductors in nature. Here, a twisting donor-acceptor triphenylamine-thiadiazol molecule (TPA-NZP) exhibits fluorescent emission through a hybridized local and charge-transfer excited state (HLCT), which is demonstrated from both fluorescent solvatochromic experiment and quantum chemical calculations. The HLCT state possesses two combined and compatible characteristics: a large transition moment from a local excited (LE) state and a weakly bound exciton from a charge transfer (CT) state. The former contributes to a high-efficiency radiation of fluorescence, while the latter is responsible for the generation of a high fraction of singlet excitons. Using TPA-NZP as the light-emitting layer in an OLED, high phi values of 93% (at low brightness) and 50% (at high brightness) are achieved, reflecting sufficient employment of the excitons in the OLED. Characterization of the EL device shows a saturated deep-red emission with CIE coordinates of (0.67, 0.32), accompanied by a rather excellent performance with a maximum luminance of 4574 cd m(-2) and a maximum external quantum efficiency ((ext)) of approximate to 2.8%. The HLCT state is a new way to realize high-efficiency of EL devices. |
| 语种 | 英语 |
| WOS记录号 | WOS:000332927700012 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/50405]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Li, Weijun |
| 作者单位 | 1.Jilin Univ, State Key Lab Supramol Struct & Mat, Changchun 130012, 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 | Li, Weijun,Pan, Yuyu,Xiao, Ran,et al. Employing similar to 100% Excitons in OLEDs by Utilizing a Fluorescent Molecule with Hybridized Local and ChargeTransfer Excited State[J]. ADVANCED FUNCTIONAL MATERIALS,2014,24(11):1609-1614. |
| APA | Li, Weijun.,Pan, Yuyu.,Xiao, Ran.,Peng, Qiming.,Zhang, Shitong.,...&Ma, Yuguang.(2014).Employing similar to 100% Excitons in OLEDs by Utilizing a Fluorescent Molecule with Hybridized Local and ChargeTransfer Excited State.ADVANCED FUNCTIONAL MATERIALS,24(11),1609-1614. |
| MLA | Li, Weijun,et al."Employing similar to 100% Excitons in OLEDs by Utilizing a Fluorescent Molecule with Hybridized Local and ChargeTransfer Excited State".ADVANCED FUNCTIONAL MATERIALS 24.11(2014):1609-1614. |
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来源：化学研究所
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