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Two phosphine oxide hosts, 1,8-bis(diphenylphosphoryl)naphthalene (NAPO) and 2,2′-bis(diphenylphosphoryl)-1,1′-binaphthyl (BiNAPO), were designed and synthesized to investigate the influence of molecular configuration and the density of functional substituents on the excited energy levels. With the much bigger conjugated area, BiNAPO has the T 1 of 2.46eV, which is only 0.17eV less than that...
A phosphine oxide (PO) host containing planar xanthene (XantPO) was chosen to investigate the influence of the structure of chromophores on the properties of the host. Owing to the multi-insulating linkages, the planar structure of XantPO also realizes high first triplet excited level (T 1 ) of 2.92 eV, and supports excellent morphological and thermal stability with the high temperature of...
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