Detail of "591773-92-1"

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Photolithographically patternable electroluminescent liquid crystalline materials for full-color organic light emitting displays

McGlashon, Andrew J.; Whitehead, Katherine S.; Bradley, Donal D. C.; Heeney, Martin; McCulloch, Iain; Zhang, Weimin; Campbell, Alasdair J. (Experimental Solid State Group, Blackett Laboratory, Imperial College of Science, Technology, Medicine SW7 2AZ, UK). Proceedings of SPIE-The International Society for Optical Engineering, 6117(Organic Photonic Materials and Devices VIII), 61170S/1-61170S/10 (English) 2006 SPIE-The International Society for Optical Engineering. CODEN: PSISDG. ISSN: 0277-786X. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Section cross-reference(s): 75 Displays based on polymer light emitting diodes are attractive due to their emissive nature, their wide viewing angles and the ability of electroluminescent conjugated polymers to be soln. processable at room temp. and pressure. It is difficult, however, to deposit sep. red, green and blue (RGB) pixels and to maximize performance by making the devices multi-layered. Here we present recent results on a semiconducting conjugated reactive-mesogen OLED material which is soln. processable, can be potentially cured and patterned by photolithog. and used in multi-layer devices. This material consists of a conjugated pentathiophene core with reactive end-groups. Spectroscopy, calorimetry and microscopy show that it forms cryst., aggregate, liq.-cryst. and isotropic phases at a range of different temps. The material is deposited by spin-coating from soln. Low d. doping with a cationic photoinitiator and exposure to a specific UV wavelength to avoid damage to the conjugated core leads to crosslinking into an insol. network. Current-voltage-luminosity and spectral measurements in std. OLED device structures show the effect of crosslinking on the transport and injection properties of the material. Quenching of fluorescence and electroluminescence is discussed. Insertion of lower-energy gap, fluorescent small mols.Some commonly used reagents like 591773-92-1 is used in this experiment. can potentially be used to tune the emission to any desired color but material limitations to this technique due to dopant removal during the washing procedure were obsd. .