Monodisperse Glassy-Nematic Conjugated Oligomers with Chemically Tunable Polarized Light Emission

• DOI: 10.1021/cm034579m
• Publication Date: 2003-11-11T05:41:58Z
• Authors: Yanhou Geng; Andrew C. A. Chen; Jane J. Ou; Shaw H. Chen; Kevin Klubek; Kathleen M. Vaeth; Ching W. Tang
• Keywords: Dichroic glass; Dichroism

A novel series of monodisperse conjugated oligomers were synthesized by inserting varied segments into blue-emitting oligofluorenes to complete the color gamut light emission. Quantum mechanical calculations revealed that electron transition dipoles lie largely parallel long molecular axes central responsible for The orientational order parameter characterizing alignment in thermally processed glassy-nematic films was evaluated at 0.77 0.87 UV−vis absorption dichroism. With an emission dichroic ratio ranging from 9.4 13.7, polarized photoluminescence provided further evidence are aligned with nematic director. Polarized organic light-emitting diodes (OLEDs) comprising selected materials resulted red and yellowish green ratios 14.4 18.0 luminance yields 0.51 5.91 cd/A, respectively. These two sets data represent best performance date OLEDs.