ORGN 119 |
| The spin statistics of electron-hole recombination in fluorescent emitters result in the formation of singlet (25%) and triplet (75%) excited states. Utilizing the energy of nonradiative host triplets by energy transfer into phosphorescent dopants is important for maximizing the efficiency of OLEDs. Here, the triplet energy transfer between the organic host and dopant depends on precise alignment of host-guest triplet levels. Unlike the energy of singlet states, tuning of the triplet energies is difficult. The use of conjugated polymers and oligomers in doped OLEDs depends on our ability to predict and engineer the triplet energy alignments. Toward this, we prepared a series of fluorene-, phenyl- and thiophene-based oligomers and phenyl-based oligomers (3E=1.86-2.54 eV). Our poster presentation discusses correlation between the structure of the conjugated fragments and their observed triplet energies. Also, the experimental triplet energies are compared with the respective theoretical values obtained from density functional theory (B3LYP/6-31G*) calculations.
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Process R&D, Physical Organic Chemistry, Heterocycles, Aromatics, Metal-Mediated Reactions
8:00 PM-10:00 PM, Sunday, March 25, 2007 Hyatt Regency Chicago -- Riverside Center, Poster
Division of Organic Chemistry |
