Synthesis and properties of highly efficient electroluminescent green phosphorescent iridium cored dendrimers

Lo, S. C., Namdas, E. B., Burn, P. L. and Samuel, I. D. W. (2003) Synthesis and properties of highly efficient electroluminescent green phosphorescent iridium cored dendrimers. Macromolecules, 36 26: 9721-9730. doi:10.1021/ma030383w


Author Lo, S. C.
Namdas, E. B.
Burn, P. L.
Samuel, I. D. W.
Title Synthesis and properties of highly efficient electroluminescent green phosphorescent iridium cored dendrimers
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
1520-5835
Publication date 2003-12-30
Sub-type Article (original research)
DOI 10.1021/ma030383w
Volume 36
Issue 26
Start page 9721
End page 9730
Total pages 10
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Language eng
Formatted abstract
A simple convergent procedure has been developed for the preparation of solution processable phosphorescent dendrimers with biphenyl-based dendrons and fac-tris(2-phenylpyridyl)iridium(III) cores. We found that the attachment point and branching of the dendrons are important for controlling the color of the light emission. Photoluminescence excitation measurements showed that energy could be transferred efficiently from the dendrons to the core. Solution photoluminescence quantum yield (PLQY) measurements of the dendrimers were of order 70%, showing that the attachment of the dendron did not decrease the luminescence efficiency of the core iridium complex. The PLQYs of the neat dendrimer films increased with generation with the second-generation dendrimer having a neat film PLQY of 31%, 1½ times higher than the first-generation dendrimers and almost 3 times that of the nondendritic iridium complex, demonstrating the power of the dendrimer architecture to control intermolecular interactions. Electrochemical experiments showed that charge was injected directly into the core of the dendrimers.
© 2003 American Chemical Society
Keyword Polymer science
Light-emitting-diodes
Conjugated polymers
Complexes
Devices
Electrophosphorescence
Layer
Generation
Transport
Emission
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Wed, 19 Sep 2007, 16:51:49 EST