Light-Emitting Fluorene Photoreactive Liquid Crystals for Organic Electroluminescence

• DOI: 10.1021/cm0351893
• Publication Date: 2007-05-30T14:58:30Z
• Authors: Mathew P. Aldred; Amanda J. Eastwood; Stephen M. Kelly; Panos Vlachos; Adam E. A. Contoret; Simon R. Farrar; Bassam Mansoor; Mary O'Neill; W. Chung Tsoi
• Keywords: Thermotropic crystal; Discotic liquid crystal; Supercooling

Light-emitting liquid crystals for organic light-emitting diodes (OLEDs) require low-temperature crystal phases room-temperature processing and a range of molecular energies electron hole injection, as well tunable color purity multicolor OLEDs. We report number polymerizable (reactive mesogens) based on 2,7-disubstituted-9,9-dialkylfluorene, whose energy levels can be tuned optimized charge injection light emission. As consequence these systematic property/structure investigations small molecule reactive mesogens have been synthezised, which exhibit low melting points, even below room temperature nematic above single components. Many the molecules retain supercooled phase cooling to temperature. Simple binary eutectic mixtures with identical aromatic cores form at high clearing point generate order parameter. The ionization potential six-ring fluorene between 4.93 5.57 eV by chemical modification cores. Similarly emission spectrum from blue green. A typical performance an OLED using such crystalline materials cross-linked polymer network is described.