# SYNTHESIS AND OPTOELECTRONIC PROPERTIES OF NOVEL FLUORENE-BASED COPOLYMER FOR RED LIGHT-EMITTING DIODES

> Title: SYNTHESIS AND OPTOELECTRONIC PROPERTIES OF NOVEL FLUORENE-BASED COPOLYMER FOR RED LIGHT-EMITTING DIODES Page Range: p.27-32 Author(s): Zhitian Liu; Shuangqiang Hu; Baolong Yang; Shuangquan Wu; Zixing Wang; Chi Zhang; Zhao Hu File size: 277K Download the pdf (subscribers only) Buy the pdf...

Canonical URL: https://polymerjournals.com/synthesis-and-optoelectronic-properties-of-novel-fluorene-based-copolymer-for-red-light-emitting-diodes/
Published: 2012-01-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: SYNTHESIS AND OPTOELECTRONIC PROPERTIES OF NOVEL FLUORENE-BASED COPOLYMER FOR RED LIGHT-EMITTING DIODES**
 Page Range: p.27-32
 Author(s): Zhitian Liu; Shuangqiang Hu; Baolong Yang; Shuangquan Wu; Zixing Wang; Chi Zhang; Zhao Hu
 File size: 277K
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc20-1-2&JournalID=101535&JIP=) (subscribers only)
 ![](http://handbuy.gif) Buy the pdf (non-subscribers)
 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 20
 Issue No: No.1-2

**Abstract**
 Novel copolymer derived from ethoxylated fluorene and 4,7-dithienyl-2,1,3-benzothiadiazole was successfully synthesised by palladium(0)-catalyzed Suziki coupling reactions. Optoelectronic properties of the copolymer were characterized by elemental analysis, NMR, UV absorption, photoluminescence (PL), and electroluminescence (EL). The films of the copolymer showed DBT-dominant red emissions. EL devices of the copolymer with a sandwich configuration of ITO/Polymer/Al displayed exclusive DBT emissions peaked at around 655 nm with the CIE coordinate of (0.67, 0.32). The polymer layer contained a conjugated copolymer that emits red light, trimethylolpropane trimethacrylate (TMPTMA), a low vapour pressure highly crosslinkable liquid, and lithium trifluoromethane sulphonate (LiTf) at a weight ratio of 20:40:1. A dynamic p-i-n junction was formed in thin films of light emitting polymers admixed with an ionically conductive medium. The PLEC device was turned on at relative low voltage 3.2 V and the brightness reached up to 1200 cd/m2 at 8 V. 24 Refs.

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