NDLI: The ‘double dendron’ approach to host free phosphorescent poly(dendrimer) OLEDs

Content Provider	Royal Society of Chemistry (RSC)
Author	Lai, Wen-Yong Samuel, Ifor D. W. Lo, Shih-Chun Burn, Paul L. Levell, Jack W. Balfour, Michael N.
Copyright Year	2012
Abstract	The addition of dendrons to iridium(III) complexes attached to a poly(styrene) backbone is shown to improve the physical and optoelectronic properties of the phosphorescent materials. The iridium(III) complexes have two 2-phenylpyridyl ligands and one phenyltriazolyl ligand, with the latter providing the attachment point to the polymer backbone. It was found that by increasing the number of dendrons (from zero to two) per 2-phenylpyridyl ligand, the intra- and interchain interactions could be more effectively controlled. The poly(dendrimer) with two dendrons per ligand had solution and solid-state photoluminescence quantum yields of 67% and 47%, respectively. Organic light-emitting diodes containing the doubly dendronised (two dendrons per ligand) poly(dendrimer) had a low turn on voltage of 3.6 V (>1.0 cd m−2), a maximum luminance of 6 700 cd m−2 (at 12.2 V), and 100 cd m−2 was achieved at 6.0 V with an external quantum efficiency (EQE) of 9.2% (28.1 cd A−1) and power efficiency of 14.7 lm/W. A solution of the doubly dendronised poly(dendrimer) in N-methyl-2-pyrolidinone was found to have a viscosity of 4.6 mPa s, which falls in the range of solutions that can be inkjet printed.
Starting Page	734
Ending Page	740
Page Count	7
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	3
Issue Number	3
Journal	Polymer Chemistry
DOI	10.1039/c2py00519k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscosity Quantum Optoelectronics Dendrimer Ligand Styrene Photoluminescence Polymer Inkjet printing Iridium
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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The ‘double dendron’ approach to host free phosphorescent poly(dendrimer) OLEDs

The development of poly(dendrimer)s for advanced processing

Facile synthesis of dendron-branched silicone polymers

Photophysical performances and morphology of phosphorescent electrospun fibres fabricated from iridium complex/PMMA blends

Facile synthesis of self-host functional iridium dendrimers up to the fourth generation with N-phenylcarbazole-based polyether dendrons for non-doped phosphorescent organic light-emitting diodes

Novel phosphorescent iridium(III) emitters for both vacuum-deposition and inkjet-printing of OLEDs with exceptionally high efficiency

Synthesis of hyperbranched polymers with controlled structure

Main-chain photochromic conducting polymers

High power efficiency phosphorescent poly(dendrimer) OLEDs.

The ‘double dendron’ approach to host free phosphorescent poly(dendrimer) OLEDs

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