Photophysics of fac-tris(2-phenylpyridine) iridium(III) cored electroluminescent dendrimers in solution and films

Namdas, Ebinazar B., Ruseckas, Arvydas, Samuel, Ifor D. W., Lo, Shih-Chun and Burn, Paul L. (2004) Photophysics of fac-tris(2-phenylpyridine) iridium(III) cored electroluminescent dendrimers in solution and films. Journal of Physical Chemistry B, 108 5: 1570-1577. doi:10.1021/jp035664k


Author Namdas, Ebinazar B.
Ruseckas, Arvydas
Samuel, Ifor D. W.
Lo, Shih-Chun
Burn, Paul L.
Title Photophysics of fac-tris(2-phenylpyridine) iridium(III) cored electroluminescent dendrimers in solution and films
Formatted title
Photophysics of fac-tris(2-phenylpyridine) iridium(III) cored electroluminescent dendrimers in solution and films
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
1520-5207
1089-5647
1089-5639
1948-7185
Publication date 2004-02-05
Sub-type Article (original research)
DOI 10.1021/jp035664k
Volume 108
Issue 5
Start page 1570
End page 1577
Total pages 8
Editor George C. Schatz
Prashant V. Kamat
Donna Minton
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Language eng
Formatted abstract
We present time-resolved photoluminescence (PL) studies of novel first- and second-generation electrophosphorescent fac-tris(2-phenylpyridine) iridium(III) [Ir(ppy)3] cored dendrimers and compare them with neat films of molecular Ir(ppy)3. A PL quantum yield of ∼0.8 is observed in blends of the dendrimers with 4,4‘-bis(N-carbazolyl)biphenyl (CBP) at room temperature, and the natural radiative lifetime of the emissive state (1.5 μs) is observed to be the same for dendrimers and molecular Ir(ppy)3. Quenching of the PL occurs in neat films, because of an energy transfer to less-emissive sites, which have ∼10 times lower oscillator strength. The PL quenching rate in spin-coated films of the first- and second-generation dendrimers is slower by a factor of 11 and 20, respectively, as compared to neat Ir(ppy)3 films prepared by evaporation. Dendrimer films showed a much smoother surface than Ir(ppy)3 films, which is consistent with more extensive aggregation of molecular Ir(ppy)3 than dendrimers.
© 2004 American Chemical Society
Keyword Chemistry, Physical
Light-emitting-diodes
Conjugated polymers
Efficiency
Photoluminescence
Complexes
Ir(III)
Devices
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Thu, 20 Sep 2007, 03:26:33 EST