標題: | Efficient red electrophosphorescence from a fluorene-based bipolar host material |
作者: | Chien, Chen-Han Hsu, Fang-Ming Shu, Ching-Fong Chi, Yun 應用化學系 Department of Applied Chemistry |
關鍵字: | OLED;Electrophosphorescence;Bipolar host material;Red-emitting;White-emitting |
公開日期: | 1-八月-2009 |
摘要: | We have prepared efficient red organic light-emitting diodes (OLEDs) incorporating 2,7-bis(diphenylphosphoryl)-9-[4-(N,N-diphenylamino)phenyl]-9-phenylfluorene (POAPF) as the host material doped with the osmium phosphor Os(fptz)(2)(PPh(2)Me)(2) (fPtZ = 3-trifluoromethyl-5-pyridyl-1,2,4-triazole). POAPF, which possesses bipolar functionalities, can facilitate both hole- and electron-injection from the charge transport layers to provide a balanced charge flux within the emission layer. The peak electroluminescence performance of the device reached as high as 19.9% and 34.5 lm/W - the highest values reported to date for a red phosphorescent OLED. In addition, we fabricated a POAPF-based white light OLED - containing red-[doped with OS(fPtZ)(2)(PPh(2)Me)(2)] and blue-emitting [doped with iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C(2')] picolinate, Firpic} layers - that also exhibited satisfactory efficiencies (18.4% and 43.9 lm/W). (C) 2009 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.orgel.2009.04.013 http://hdl.handle.net/11536/6898 |
ISSN: | 1566-1199 |
DOI: | 10.1016/j.orgel.2009.04.013 |
期刊: | ORGANIC ELECTRONICS |
Volume: | 10 |
Issue: | 5 |
起始頁: | 871 |
結束頁: | 876 |
顯示於類別: | 期刊論文 |