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Triplet state properties of a red emitting [Pt(s-thpy)(acac)] compound

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  • 540 Chemie


A photophysical characterization based on optical high-resolution spectra and emission decay properties at low temperatures and at high magnetic fields is carried out for [Pt(s-thpy)(acac)] (s-thpy = 5,2-bis(2-thienyl)pyridinate and acac = acetylacetonate). The electronic 0-0 transition between the lowest triplet state and the ground state lies at 16150 cm⁻¹ (619 nm). The zero-field splitting (ZFS) of T₁ is smaller than 1 cm⁻¹. Thus, the emitting excited state is mainly of ligand-centered ³LC(³ππ*) character and experiences only weak spin-orbit couplings to higher lying singlet states. The compound does not fulfill important requirements for OLED applications, but strategies for improvements are pointed out.

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