The development of poly(dendrimer)s for advanced processing

Gunning, Jack P., Levell, Jack W., Wyatt, Mark F., Burn, Paul L., Robertson, Jeremy and Samuel, Ifor D. W. (2010) The development of poly(dendrimer)s for advanced processing. Polymer Chemistry, 1 5: 730-738. doi:10.1039/c0py00039f

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Author Gunning, Jack P.
Levell, Jack W.
Wyatt, Mark F.
Burn, Paul L.
Robertson, Jeremy
Samuel, Ifor D. W.
Title The development of poly(dendrimer)s for advanced processing
Journal name Polymer Chemistry   Check publisher's open access policy
ISSN 1759-9954
1759-9962
Publication date 2010-07
Sub-type Article (original research)
DOI 10.1039/c0py00039f
Open Access Status Not Open Access
Volume 1
Issue 5
Start page 730
End page 738
Total pages 9
Editor David Haddleton
Place of publication Cambridge, U.K.
Publisher Royal Society of Chemistry
Collection year 2011
Language eng
Subject C1
0303 Macromolecular and Materials Chemistry
0912 Materials Engineering
Formatted abstract
A norbornenyl-based homopolymer that has a dendronised iridium(III) complex attached to every monomer unit has been synthesized. The dendronised iridium(III) complex is comprised of three facially arranged 2-phenylpyridyl ligands. Two of the ligands bear first generation biphenyl-based dendrons with 2-ethylhexyloxy surface groups attached and the third ligand is attached to the polymer backbone via a benzyloxy ester. The polymer was formed by ring opening metathesis using the Grubbs III catalyst and was found to have an Mp of 130 kDa by MALDI-TOF mass spectrometry. At a concentration of 25 mg cm−3 the polymer solution had a viscosity of 1.09 mPa s, which was 34% higher than a solution containing a dendrimer of same weight per volume. The dendrimer had the same core, dendrons, and surface groups but differed from the polymer in that it had dendrons attached to three of the ligands rather than the two of the polymer. The solution photoluminescence quantum yield (PLQY) of the poly(dendrimer) was found to be 57%, indicating that intra-polymer chromophore interactions were not leading to strong quenching of the luminescence. However, in the solid-state the PLQY dropped significantly, indicating that inter-polymer chromophore interactions were significant. The presence of the dendrons allowed the simple blending of the polymer with 4,4′-bis(N-carbazolyl)-2,2′-biphenyl (CBP), and the blended film had a PLQY of 50%. Simple bilayer devices with a blended emissive layer and an electron injection and transport layer had an external quantum efficiency of 6.2% at a brightness of 100 cd m−2, showing that poly(dendrimer)s are a promising class of OLED material.
© The Royal Society of Chemistry 2010
Keyword Light-emitting-diodes
Iridium complexes
Phosphorescent dendrimers
Conjugated polymers
IR complexes
Copolymers
Efficient
Fluorene
Cores
Chain
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
Official 2011 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 15 times in Scopus Article | Citations
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Created: Sun, 01 Aug 2010, 00:01:45 EST