| Title | Long-Lived and Highly Efficient TADF-PhOLED with "(A)(n)-D-(A)(n)" Structured Terpyridine Electron-Transporting Material |
| Authors | Bian, Mengying Zhang, Dongdong Wang, Yuanxun Chung, Yao-Hsien Liu, Yang Ting, Hungkit Duan, Lian Chen, Zhijian Bian, Zuqiang Liu, Zhiwei Xiao, Lixin |
| Affiliation | Peking Univ, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. Peking Univ, Dept Phys, Beijing 100871, Peoples R China. Tsinghua Univ, Minist Educ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China. Valiant Corp, Yantai 264006, Shandong, Peoples R China. Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China. Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China. Peking Univ, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. Xiao, LX (reprint author), Peking Univ, Dept Phys, Beijing 100871, Peoples R China. Liu, ZW (reprint author), Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China. Xiao, LX (reprint author), Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China. |
| Keywords | electron-transporting long lifetime organic light-emitting diodes phosphorescence terpyridine thermally activated delayed fluorescence LIGHT-EMITTING-DIODES ORGANIC ELECTROLUMINESCENT DIODES STRUCTURE-PROPERTY RELATIONSHIP TRIPLET EXCHANGE ENERGY LOW DRIVING VOLTAGE DEEP-BLUE ELECTROPHOSPHORESCENT DEVICES HOST MATERIAL PHOSPHORESCENT OLEDS QUANTUM EFFICIENCY |
| Issue Date | 2018 |
| Publisher | ADVANCED FUNCTIONAL MATERIALS |
| Citation | ADVANCED FUNCTIONAL MATERIALS. 2018, 28(28). |
| Abstract | The electron-transporting material (ETM) is one of the key factors to determine the efficiency and stability of organic light-emitting diodes (OLEDs). A novel ETM with a "(Acceptor)(n)-Donor-(Acceptor)(n)" ("(A)(n)-D-(A)(n)") structure, 2,7-di([2,2:6,2-terpyridin]-4-yl)-9,9-spirobifluorene (27-TPSF), is synthesized by combining electron-withdrawing terpyridine (TPY) moieties and rigid twisted spirobifluorene, in which the TPY moieties facilitate electron transport and injection while the spirobifluorene moiety ensures high triplet energy (T-1 = 2.5 eV) as well as enhances glass transition temperature (T-g = 195 degrees C) for better stability. By using tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy)(3)) as the emitter, the 27-TPSF-based device exhibits a maximum external quantum efficiency (eta(ext, max)) of 24.5%, and a half-life (T-50) of 121, 6804, and 382 636 h at an initial luminance of 10 000, 1000, and 100 cd m(-2), respectively, which are much better than the commercialized ETM of 9,10-bis(6-phenylpyridin-3-yl)anthracene (DPPyA). Furthermore, a higher efficiency, a eta(ext, max) of 28.2% and a maximum power efficiency (eta(PE), (max)) of 129.3 lm W-1, can be achieved by adopting bis(2- phenylpyridine)iridium(III)(2,2,6,6-tetramethylheptane-3,5-diketonate) (Ir(ppy)(2)tmd) as the emitter and 27-TPSF as the ETM. These results indicate that the derivative of TPY to form (A)(n)-D-(A)(n) structure is a promising way to design an ETM with good comprehensive properties for OLEDs. |
| URI | http://hdl.handle.net/20.500.11897/523243 |
| ISSN | 1616-301X |
| DOI | 10.1002/adfm.201800429 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 人工微结构和介观物理国家重点实验室 å å¦ä¸ å å å·¥ç¨ å¦é ¢ 稀土材料化学与应用国家重点实验室 |
