Highly efficient polymer phosphorescent light-emitting devices based on a new polyfluorene derivative as host

doi:10.1088/1674-1056/20/8/088502

Abstract Several highly efficient iridium-complex polymer light-emitting devices (PLEDs) are fabricated, with a newly synthesized blue conjugated polymer, poly[(9,9-bis(4-(2-ethylhexyloxy)phenyl)-fluorene)-co-(3,7-dibenziothiene-S,S-dioxide15)] (PPF-3,7SO15), chosen as host. High luminous efficiencies of 7.4 cd·A^-1 and 27.4 cd·A^-1 are achieved in red and green PLEDs, respectively, by optimizing the doping concentrations of red phosphorescent dye iridium bis(1-phenylisoquinoline) (acetylacetonate) (Ir(piq)) and green phosphorescent dye iridium tris(2-(4-tolyl)pyridinato-N, C^2') (Ir(mppy)₃). Furthermore, highly efficient white PLEDs (WPLEDs) with the Commission Internationale de l'Eclairage (CIE) coordinates of (0.35, 0.38) are successfully produced by carefully controlling the doping concentration of the iridium complex. The obtained WPLEDs show maximal efficiencies of 14.4 cd·A^-1 and 10.1 lm·W^-1, which are comparable to those of incandescent bulbs. Moreover, the electroluminescent spectrum of the white device with an initial luminance of about 1000 cd·m^-2 is stable, subject to constant applied current stress, indicating that good device stability can be obtained in this system.

Keywords: phosphorescent polymer light-emitting devices host white

Received: 13 March 2011
Revised: 25 April 2011
Accepted manuscript online:

PACS:	85.60.Bt	(Optoelectronic device characterization, design, and modeling)
	78.55.Kz	(Solid organic materials)
	85.60.Jb	(Light-emitting devices)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2009CB623602) and the National Natural Science Foundation of China (Grant No. U0634003).

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Wang Bao-Zheng(王保争), Liu Jie(刘杰), Wu Hong-Bin(吴宏滨), Zhang Bin(张斌), Wen Shang-Sheng(文尚胜), and Yang Wei(杨伟) Highly efficient polymer phosphorescent light-emitting devices based on a new polyfluorene derivative as host 2011 Chin. Phys. B 20 088502

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Highly efficient polymer phosphorescent light-emitting devices based on a new polyfluorene derivative as host

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