The development of phenylethylene dendrons for blue phosphorescent emitters

Lo, Shih-Chun, Harding, Ruth E., Brightman, Edward, Burn, Paul L. and Samuel, Ifor D. W. (2009) The development of phenylethylene dendrons for blue phosphorescent emitters. Journal of Materials Chemistry, 19 20: 3213-3227. doi:10.1039/b820235d

Author Lo, Shih-Chun
Harding, Ruth E.
Brightman, Edward
Burn, Paul L.
Samuel, Ifor D. W.
Title The development of phenylethylene dendrons for blue phosphorescent emitters
Journal name Journal of Materials Chemistry   Check publisher's open access policy
ISSN 0959-9428
Publication date 2009-03-24
Year available 2009
Sub-type Article (original research)
DOI 10.1039/b820235d
Open Access Status Not Open Access
Volume 19
Issue 20
Start page 3213
End page 3227
Total pages 15
Editor Carol Stanier
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Subject 970102 Expanding Knowledge in the Physical Sciences
970103 Expanding Knowledge in the Chemical Sciences
020499 Condensed Matter Physics not elsewhere classified
030204 Main Group Metal Chemistry
020504 Photonics, Optoelectronics and Optical Communications
020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity
030503 Organic Chemical Synthesis
030303 Optical Properties of Materials
030301 Chemical Characterisation of Materials
030306 Synthesis of Materials
091208 Organic Semiconductors
Abstract New high triplet energy dendrons based on 1,2-diphenylethylene with and without 2-ethylhexyloxy surface groups have been developed for deep blue phosphorescent iridium(III) dendrimers. The fac-tris[1-methyl-5-(4-fluoro)phenyl-3-n-propyl-1H-[1,2,4]triazolyl]iridium(III)-cored dendrimers, bearing first generation 1,2-diphenylethylene dendrons on the ligand triazolyl and phenyl rings, were prepared in excellent yields, employing Sonogashira cross-couplings and palladium catalysed hydrogenation as the key synthetic steps. Both dendrimers showed good thermal stability although the flexible nature of the dendrons led to the materials having low glass transition temperatures. Dendrimer 15 (without the surface groups) emitted good blue phosphorescence with a solution photoluminescence quantum yield (PLQY) of 46%, Commission Internationale de l'Eclairage (CIE) co-ordinates of (0.15, 0.14) and photoluminescence peaks at 441 and 468 nm. The solution PLQY was 50% higher than the parent iridium(III) complex showing that the high triplet energy of the diphenylethylene dendrons does not quench the luminescence of the iridium(III) complex core. Dendrimer 34, which has the surface groups, had a film PLQY of 49% and CIE co-ordinates of (0.16, 0.19) with PL peaks at 441 and 469 nm.
Keyword Chemistry, Physical
Materials Science, Multidisciplinary
Materials Science
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID FF0668728
Institutional Status UQ

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Created: Fri, 05 Jun 2009, 01:22:34 EST by Ms Lynette Adams on behalf of School of Chemistry & Molecular Biosciences