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- W2005172227 abstract "A simple convergent procedure has been developed for the formation of sterically encumbered phosphorescent dendrimers. The procedure is demonstrated with the preparation of a first-generation dendrimer composed of a fac-tris(2-phenylpyridyl)iridium(III) core and three dendrons. Each dendron is comprised of a branching phenyl unit with a further four phenyl groups attached. The lack of surface groups on the dendrons was found to reduce solubility and also reduced the level of control over the intermolecular interactions of the emissive and electroactive core in films. The 6-fold decrease in photoluminescence quantum yield in going from solution (69%) to the solid state (11%) showed that there were strong intermolecular interactions of the emissive cores in the solid state. Single-layer devices with the dendrimer blended with 4,4‘-bis(N-carbazolyl)biphenyl showed an external quantum efficiency of 1.7% (5.4 cd/A) at 100 cd/m2 and 11.4 V, giving a power efficiency of 1.5 lm/W." @default.
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- W2005172227 date "2005-10-19" @default.
- W2005172227 modified "2023-10-14" @default.
- W2005172227 title "Investigating the Effect of Steric Crowding in Phosphorescent Dendrimers" @default.
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- W2005172227 doi "https://doi.org/10.1021/ma050609q" @default.
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