# FILM MORPHOLOGY AND ELECTROLUMINESCENCE OF POLY\[9,9-DI-(2′-ETHYLHEXYL) FLUORENYL-2,7-DIYL\] BLENDED WITH A HOLE TRANSPORTING POLYMER

> Title: FILM MORPHOLOGY AND ELECTROLUMINESCENCE OF POLY[9,9-DI-(2'-ETHYLHEXYL) FLUORENYL-2,7-DIYL] BLENDED WITH A HOLE TRANSPORTING POLYMER Page Range: p.469-476 Author(s): Qiushu Zhang File size: 365K Download the pdf (subscribers only) Buy the pdf (non-subscribers) Journal: Polymers and Polymer Composites Issue Year: ppc Volume: 18...

Canonical URL: https://polymerjournals.com/film-morphology-and-electroluminescence-of-poly99-di-2-ethylhexyl-fluorenyl-27-diyl-blended-with-a-hole-transporting-polymer/
Published: 2010-09-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: FILM MORPHOLOGY AND ELECTROLUMINESCENCE OF POLY[9,9-DI-(2'-ETHYLHEXYL) FLUORENYL-2,7-DIYL] BLENDED WITH A HOLE TRANSPORTING POLYMER**
 Page Range: p.469-476
 Author(s): Qiushu Zhang
 File size: 365K
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc18-9&JournalID=101238&JIP=) (subscribers only)
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 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 18
 Issue No: No.9

**Abstract**
 This paper reports on the phase-separated film morphology and electroluminescence (EL) of a polyfluorene, poly[9,9-di-(2'-ethylhexyl)fluorenyl-2,7-diyl], blended with the hole transport material, poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(N,N'-bis(4-butylphenyl -1,1'-biphenylene-4,4'-diamine))]. The film morphology changes remarkably with the blend ratio. Other factors like polymer solution concentration, substrate and film thickness could also influence the film morphology. The addition of the hole-transporting polymer to the host polymer improved device properties of light-emitting diodes (LEDs). The maximum luminance achieved was 884 cd/m2. The maximum external quantum efficiency of the blended polyfluorene devices was 0.1%, which is more than three times higher than that of the pristine polyfluorene LEDs. The introduction of the hole-transporting polymer also modifies the EL spectrum. For the blend-based devices, the EL peaked at 504 nm, having a blue shift of 33 nm compared to that of the single polymer based devices. Phase-separated domains, or interactions at their interfaces, may play a role in the improved device performance. 28 Refs.

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