Organic Blue Light-Emitting Diodes and Field-Effect Transistors Based on Monodisperse Conjugated Oligomers
نویسندگان
چکیده
Monodisperse conjugated oligomers are potentially useful for organic electronics because of chemical purity and structural uniformity, facilitating the elucidation of structure-property relationships and the realization of superior device performance. Nematic liquid crystalline conjugated oligomers with above-ambient glass transition temperatures represent an attractive approach to prepare uniaxially aligned thin films across large areas for linearly polarized light emission and anisotropic charge transport. The temporal stability of blue light-emitting materials is also a major hurdle to practical applications. This thesis research, therefore, has focused on organic electronic devices incorporating monodisperse conjugated oligomers comprising fluorene and other conjugated units for blue light emission and charge transport. Key results are summarized as follows: (1) The thermotropic and optical properties of monodisperse, conjugated glassy-nematic liquid crystalline oligo(fluorene)s were characterized and related to the molecular structures. The optical dichroism, birefringence, and polarization ratio in fluorescence increased with the molecular aspect ratio. Annealed thin films displayed strongly polarized blue emission with high quantum yield. (2) The same monodisperse materials were incorporated in strongly polarized, efficient, deep blue OLEDs. By employing a conductive alignment layer, an
منابع مشابه
Fluorene-Based Conjugated Oligomers for Organic Photonics and Electronics
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