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Updated: Feb 12, 2026

Absolute Quantum Yield Measurement of Powder Samples
Published on: May 12, 2012
Enhanced quantum yields by sterically demanding aryl-substituted β-diketonate ancillary ligands
Rebecca Pittkowski1, Thomas Strassner1
1Physical Organic Chemistry, Technische Universität Dresden, Bergstraße, 01069 Dresden, Germany.
Abstract:
Luminescent organometallic platinum(II) compounds are of interest as phosphors for organic light emitting devices. Their emissive properties can be tuned by variation of the ligands or by specific electron-withdrawing or electron-donating substituents. Different ancillary ligands can have a profound impact on the emission color and emission efficiency of these complexes. We studied the influence of sterically hindered, aryl-substituted β-diketonates on the emission properties of C^C* cyclometalated complexes, employing the unsubstituted methyl-phenyl-imidazolium ligand. The quantum yield was significantly enhanced by changing the auxiliary ligand from acetylacetonate, where the corresponding platinum(II) complex shows only a very weak emission, to mesityl (mes) or duryl (dur) substituted acetylacetonates. The new complexes show very efficient emission with quantum yields >70% in the sky-blue spectral region (480 nm) and short decay times (<3 μs).
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