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Let there be light! An effective strategy for the design of highly efficient phosphine oxide light-emitting-diode hosts with an ortho-linked structure has been demonstrated by synthesizing 4-diphenylphosphoryl dibenzofuran. The ortho linkage of the phosphine oxide moiety has the dual effect of retaining high T1 levels and efficiently polarising chromophores (see graphic).
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Han et al. (2010) studied this question.
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