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- W1879290834 abstract "We synthesized a series of purely organic phosphors, bromobenzaldehyde derivatives, with varying conjugation length to investigate the effects of conjugation length on their phosphorescence emission properties. As the conjugation length increases phosphorescence efficiency decreases with a redshift in the emission color at 77 K. Our computational results imply that this correlation is related to the intersystem crossing rate and that the rate is determined by spin-orbit coupling strength rather than by simply the energy difference between the lowest lying singlet and triplet states. TD-DFT calculations show that the S1 → T1 transition occurs more dominantly than the S1 → T2 transition for all cases. Moreover, singlet excited states are localized on the aldehyde functional group, regardless of the conjugation length, while triplet excited states are evenly distributed over the conjugated backbone. Consequently, as the conjugation length increases, the larger spatial separation between singlet and triplet states diminishes the spin-orbit coupling efficiency, resulting in reduced phosphorescence." @default.
- W1879290834 created "2016-06-24" @default.
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- W1879290834 date "2015-01-01" @default.
- W1879290834 modified "2023-10-18" @default.
- W1879290834 title "The effects of extended conjugation length of purely organic phosphors on their phosphorescence emission properties" @default.
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- W1879290834 doi "https://doi.org/10.1039/c5cp01003a" @default.
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