Determination of molecular dipole orientation in doped fluorescent organic thin films by photoluminescence measurements

Frischeisen, Jörg; Yokoyama, Daisuke; Adachi, Chihaya; Brütting, Wolfgang
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p073302
Academic Journal
The orientation of the transition dipole moments of fluorescent organic molecules doped into a matrix material is determined by photoluminescence measurements of the angular dependent emission spectra and by comparison with simulations. The analysis of two small molecular materials doped into a 4,4′-bis(N-carbazole)-biphenyl matrix is demonstrated, yielding a horizontal orientation of 91% for 4,4′-bis[4-(diphenylamino)styryl]biphenyl and a completely random orientation in case of tris-(8-hydroxyquinoline)aluminum (Alq3). This expeditious technique does not require detailed information about the optical properties of the dopant, making this method particularly suitable for characterizing newly developed materials for organic light-emitting diodes with enhanced light-outcoupling efficiency.


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