Title: Efficient red electrophosphorescence from a fluorene-based bipolar host material
Authors: Chien, Chen-Han
Hsu, Fang-Ming
Shu, Ching-Fong
Chi, Yun
應用化學系
Department of Applied Chemistry
Keywords: OLED;Electrophosphorescence;Bipolar host material;Red-emitting;White-emitting
Issue Date: 1-Aug-2009
Abstract: 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
Journal: ORGANIC ELECTRONICS
Volume: 10
Issue: 5
Begin Page: 871
End Page: 876
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