Title
Poly(dendrimers) with phosphorescent iridium(III) complex-based side chains prepared via ring-opening metathesis polymerization
Author
Lai, W.-Y.
Balfour, M.N.
Levell, J.W.
Bansal, A.K.
Burn, P.L.
Lo, S.-C.
Samuel, I.D.W.
Publication year
2012
Abstract
Phosphorescent poly(dendrimers) with a norbornene-derived backbone have been synthesized using ring-opening metathesis polymerization with the Grubbs III catalyst. The dendrimers are comprised of a heteroleptic iridium(III) complex core with two 2-phenylpyridyl ligands and a phenyltriazolyl ligand, biphenyl-based dendrons, and 2-ethylhexyloxy surface groups. The phenyltriazolyl ligand provides the attachment point to the polymer backbone, and the two poly(dendrimers) differ in the number of dendrons attached to the 2-phenylpyridyl ligands. The poly(dendrimer) with one and two dendrons per ligand are termed mono- and doubly dendronized. The mono- and doubly dendronized poly(dendrimers) were found to have relatively narrow polydispersities, around 1.4, viscosities approaching those required for inkjet printing, and could be solution processed to form thin films. The dendrons played an important role in controlling the photophysical properties of the materials. The parent homopolymer with the same iridium(III) complex but no dendrons attached to the ligands had a solution photoluminescence quantum yield (PLQY) of 48%. The solution PLQY was found to increase with increasing number of dendrons with the mono- and doubly dendronized materials having solution PLQYs of 65% and 71%, respectively. The increase in PLQY is due to decreased intrachain interchromophore interactions. A similar trend was observed in the solid state with the parent, mono-, and doubly dendronized polymers having film PLQYs of 2%, 44%, and 58%, respectively, demonstrating that both intra- and interchain interactions are controlled by the dendrons. © 2012 American Chemical Society.
Subject
Mechatronics, Mechanics & Materials
HOL - Holst
TS - Technical Sciences
High Tech Systems & Materials
Materials
Industrial Innovation
Attachment points
Dendronized polymers
Dendrons
Heteroleptic
Interchain interactions
Iridium complex
Photoluminescence quantum yields
Photophysical properties
Polymer backbones
Ring opening metathesis polymerization
Side-chains
Solution-processed
Surface groups
Iridium compounds
Ligands
Light emission
Materials properties
Phosphorescence
Quantum yield
Ring opening polymerization
Dendrimers
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TNO identifier
461325
ISSN
0024-9297
Source
Macromolecules, 45 (7), 2963-2971
Document type
article