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Lo SC, Harding RE, Shipley CP, et al. High-triplet-energy dendrons: enhancing the luminescence of deep blue phosphorescent iridium(III) complexes. J Am Chem Soc. 2009;131(46):16681-8doi: 10.1021/ja903157e.
Lo, S. C., Harding, R. E., Shipley, C. P., Stevenson, S. G., Burn, P. L., & Samuel, I. D. (2009). High-triplet-energy dendrons: enhancing the luminescence of deep blue phosphorescent iridium(III) complexes. Journal of the American Chemical Society, 131(46), 16681-8. https://doi.org/10.1021/ja903157e
Lo, Shih-Chun, et al. "High-triplet-energy dendrons: enhancing the luminescence of deep blue phosphorescent iridium(III) complexes." Journal of the American Chemical Society vol. 131,46 (2009): 16681-8. doi: https://doi.org/10.1021/ja903157e
Lo SC, Harding RE, Shipley CP, Stevenson SG, Burn PL, Samuel ID. High-triplet-energy dendrons: enhancing the luminescence of deep blue phosphorescent iridium(III) complexes. J Am Chem Soc. 2009 Nov 25;131(46):16681-8. doi: 10.1021/ja903157e. PMID: 19919142.
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J Am Chem Soc. 2009 Nov 25;131(46):16681-8. doi: 10.1021/ja903157e.

High-triplet-energy dendrons: enhancing the luminescence of deep blue phosphorescent iridium(III) complexes.

Journal of the American Chemical Society

Shih-Chun Lo, Ruth E Harding, Christopher P Shipley, Stuart G Stevenson, Paul L Burn, Ifor D W Samuel

Affiliations

  1. Centre for Organic Photonics & Electronics, The University of Queensland, School of Chemistry & Molecular Biosciences, QLD 4072, Australia.

PMID: 19919142 DOI: 10.1021/ja903157e

Abstract

Solution-processable blue phosphorescent emitters with high luminescence efficiency are highly desirable for large-area displays and lighting applications. This report shows that when a fac-tris[1-methyl-5-(4-fluorophenyl)-3-n-propyl-1H-[1,2,4]triazolyl]iridium(III) complex core is encapsulated by rigid high-triplet-energy dendrons, both the physical and photophysical properties can be optimized. The high-triplet-energy and rigid dendrons were composed of twisted biphenyl dendrons with the twisting arising from the use of tetrasubstituted branching phenyl rings. The blue phosphorescent dendrimer was synthesized using a convergent approach and was found to be solution-processable and to possess a high glass transition temperature of 148 degrees C. The dendrimer had an exceptionally high solution photoluminescence quantum yield (PLQY) of 94%, which was more than three times that of the simple parent core complex (27%). The rigid and high-triplet-energy dendrons were also found to control the intermolecular interactions that lead to the quenching of the luminescence in the solid state, and the film PLQY was found to be 60% with the emission having Commission Internationale de l'Eclairage coordinates of (0.16, 0.16). The results demonstrate that dendronization of simple chromophores can enhance their properties. Single layer neat dendrimer organic light-emitting diodes (OLEDs) had an external quantum efficiency (EQE) of 0.4% at 100 cd/m(2). Bilayer devices with an electron transport layer gave improved EQEs of up to 3.9%. Time-resolved luminescence measurements suggest that quenching of triplets by the electron transport layer used in the bilayer OLEDs limits performance.

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