10 November 2004 Singlet and triplet emission from polymers for OLED application
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Efficient electroluminescence is difficult to achieve using purely organic materials as only S0 <-> S* transitions (25 % quantum efficiency according to spin statistics) will be allowed when the spin selection rule is obeyed. In most strictly organic systems the triplet state energy will decay non-radiatively. In order to improve the electroluminescent quantum efficiency of light emitting polymers, triplet state emitting complexes have been introduced into the polymer either by blending or copolymerization. The strong spin-orbit coupling from the heavy metal atoms allows effective mixing of singlet and triplet states to provide strong radiative decay. Two approaches to the synthesis of solution-processible phosphorescent polymers have been developed and the degree of energy transfer from the polymer host to the triplet emitter has also been investigated. The phosphorescent core, [Ir(btp)2(acac)], where btp is 2-(2'-benzo[b]thienyl)pyridinato and acac is acetylacetonate, can either be incorporated into the polymer chain through the extension of the ligands or tethered to the polymer backbone through an alkyl pendant. In addition, the synthesis of high band gap polymer hosts will also be discussed.
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Chris S. K. Mak, Chris S. K. Mak, Nicholas R. Evans, Nicholas R. Evans, Scott E. Watkins, Scott E. Watkins, Charlotte K. Williams, Charlotte K. Williams, Andrew B. Holmes, Andrew B. Holmes, Clare E. Boothby, Clare E. Boothby, Anna Koehler, Anna Koehler, Richard H. Friend, Richard H. Friend, } "Singlet and triplet emission from polymers for OLED application", Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); doi: 10.1117/12.567679; https://doi.org/10.1117/12.567679

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