Enhanced quantum yields by sterically demanding aryl-substituted β-diketonate ancillary ligands

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...

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Bibliographic Details
Published in:Beilstein journal of organic chemistry 2018-03, Vol.14 (1), p.664-671
Main Authors: Pittkowski, Rebecca, Strassner, Thomas
Format: Article
Language:English
Subjects:
ancillary ligand
Chemistry
Chromatography
Cold
Ethanol
Full Research Paper
Ligands
photoluminescence
Platinum
platinum(II) complex
quantum yield
β-diketonates
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Summary: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 (
ISSN:1860-5397
2195-951X
1860-5397
DOI:10.3762/bjoc.14.54