27 August 1993 Space-resolved recombination electroluminescence in organic crystals
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The elucidation of spatial distribution of emitting states in electroluminescent (EL) cells is a challenge to both a refined scientific probe of materials and to design a variety of EL devices. In molecular organic crystals important aspects of this distribution can be mapped onto a trap- dependent electron-hole recombination process involving exciton-charge carrier interaction. We use this process to describe the space-resolved EL in single crystals of anthracene and tetracene as a function of applied electric field. The emphasis of the paper will be on the importance of EL spatial pattern of the charge injection ability of electrodes and distributions of electron and hole traps. Detailed features of the spatial EL intensity patterns in these crystals will be illustrated as a function of electric field and type of injecting contacts. They differ essentially for these two model crystals. In particular, it will be shown that a splitting of the anode EL zone, proceeding regularly with increasing voltage in tetracene, disappears in anthracene crystals.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan Kalinowski, Jan Kalinowski, "Space-resolved recombination electroluminescence in organic crystals", Proc. SPIE 1910, Electroluminescent Materials, Devices, and Large-Screen Displays, (27 August 1993); doi: 10.1117/12.151140; https://doi.org/10.1117/12.151140

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