A Red Fluorescent Emitter with a Simultaneous Hybrid Local and Charge Transfer Excited State and Aggregation-Induced Emission for High-Efficiency, Low Efficiency Roll-Off OLEDs
文献类型：期刊论文
| 作者 | Liu, Tengxiao; Zhu, Liping; Gong, Shaolong; Zhong, Cheng; Xie, Guohua; Mao, Erqian; Fang, Junfeng; Ma, Dongge; Yang, Chuluo |
| 刊名 | ADVANCED OPTICAL MATERIALS
 |
| 出版日期 | 2017 |
| 卷号 | 5期号:13页码:1700145 |
| ISSN号 | 2195-1071 |
| 英文摘要 | Most red/deep-red fluorescent organic light-emitting diodes (OLEDs) suffer from a low exciton utilization efficiency (eta(gamma)) and a drastic efficiency roll-off at high brightness. This work reports a new red fluorescent emitter with a D-pi-A-pi-D architecture, namely, 4,9-bis(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)naphtho[2,3-c][1,2,5]thiadiazole (NZ2AC). The new emitter shows a hybrid local and charge transfer (HLCT) excited state, which can utilize the triplet excitons by the reverse intersystem cross process via the high-lying triplet channel. A red OLED with an emission peak at 612 nm achieves a maximum external quantum efficiency (EQE) of 6.2% at a doping concentration of 8 wt% NZ2AC in a 4,4'-bis(9-carbazolyl)-2,2'-biphenyl host. Moreover, the new emitter reveals a typical aggregation-induced emission (AIE) property, and consequently, the nondoped OLEDs exhibit a deep-red emission at 663 nm with a maximum EQE of 2.8%, corresponding to a maximum exciton utilization ratio of 93%. Attributed to the simultaneous HLCT and AIE features, both the doped and nondoped devices exhibit low efficiency roll-off at high brightness, with their EQEs remaining at high values of 3.0% and 2.3% at the high luminance of 5000 cd m(-2), respectively, which are among the highest efficiencies at such high luminance for red/deep-red OLEDs. |
| 公开日期 | 2017-12-25 |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/13739]  |
| 专题 | 2017专题 |
| 推荐引用方式 GB/T 7714 | Liu, Tengxiao,Zhu, Liping,Gong, Shaolong,et al. A Red Fluorescent Emitter with a Simultaneous Hybrid Local and Charge Transfer Excited State and Aggregation-Induced Emission for High-Efficiency, Low Efficiency Roll-Off OLEDs[J]. ADVANCED OPTICAL MATERIALS,2017,5(13):1700145. |
| APA | Liu, Tengxiao.,Zhu, Liping.,Gong, Shaolong.,Zhong, Cheng.,Xie, Guohua.,...&Yang, Chuluo.(2017).A Red Fluorescent Emitter with a Simultaneous Hybrid Local and Charge Transfer Excited State and Aggregation-Induced Emission for High-Efficiency, Low Efficiency Roll-Off OLEDs.ADVANCED OPTICAL MATERIALS,5(13),1700145. |
| MLA | Liu, Tengxiao,et al."A Red Fluorescent Emitter with a Simultaneous Hybrid Local and Charge Transfer Excited State and Aggregation-Induced Emission for High-Efficiency, Low Efficiency Roll-Off OLEDs".ADVANCED OPTICAL MATERIALS 5.13(2017):1700145. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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