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Photophysical and electroluminescent properties of fluorene-based binary and ternary donor–acceptor polymer blends

✍ Scribed by Wen-Chung Wu; Wen-Ya Lee; Chia-Ling Pai; Wen-Chang Chen; Chih-Shen Tuan; Jen-Lien Lin

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
525 KB
Volume
45
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

The photophysical and electroluminescent properties of fluorene‐based polymer blend systems were studied, including blue‐emitting poly[2,7‐(9,9′‐dihexylfluorene)] (PF), green‐emitting poly[2,7‐(9,9′‐dihexylfluorene)‐alt‐5,8‐quinoxaline] (PFQ), yellow‐emitting poly[2,7‐(9,9′‐dihexylfluorene)‐alt‐4,7‐(2,1,3‐benzothiadiazole)] (PFBT), and red‐emitting poly[2,7‐(9,9′‐dihexylfluorene)‐alt‐5,7‐(thieno[3,4‐b]pyrazine)] (PFTP). The binary polymer blends, based on PF blended with 5–25 wt % PFQ or PFBT, were studied to rationalize the effects of the chemical structures and compositions on the intermolecular energy transfer and quantum efficiency. A significant enhancement of quantum efficiency was observed by the blending of a relatively small amount of PFQ or PFBT. Ternary blends composed of PF, PFQ (or PFBT), and PFTP were also studied for potential white‐light‐emitting diodes (WLEDs). The precise composition control of the polymer blends resulted in incomplete Förster energy transfer and emissions from all the components simultaneously. White‐emitting electroluminescence was achieved by the blending of PF with relatively small amounts of the PFQ (or PFBT) and PFTP. The luminance yield and maximum external quantum efficiency of the WLED with the ternary blend FBTTP1 (PF/PFBT/PFTP = 99.65:0.05:0.30 w/w/w) as the emissive layer were 1.89 cd/A and 0.47%, respectively. The electron‐acceptor characteristics, Förster energy transfer, and emissive colors govern the design of WLEDs. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 67–78, 2007

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