ORGN 174 |
Novel pentacene derivatives for use as red emitters in organic light-emitting diodes
| Mason A. Wolak, Bo-Bin Jang, Lisa C. Picciolo, and Z. H. Kafafi. Optical Sciences Division, US Naval Research Laboratory, 4555 Overlook Ave. S.W, Washington, DC 20375 |
| Substituted and unsubstituted pentacenes have been identified as promising electro-active materials for use in numerous electronic and photonic devices. Thin film transistors based on pentacene exhibit reasonably high field-effect carrier mobilities and large on-off ratios. We have recently reported on efficient organic light-emitting diodes (OLEDs) with saturated red emission using 6,13-diphenylpentacene (DPP, 1).1 DPP displays strong solid state luminescent characteristics and relatively narrow emission when dispersed in organic hosts such as tris(8-hydroxyquinolinato) aluminum (III). We have synthesized and characterized a series of novel pentacene derivatives based on DPP. The optical and fluorescence spectra of these new derivatives have been recorded in solution and in organic solids. The absolute fluorescence quantum yields of thin films of these pentacene derivatives embedded in organic hosts have also been measured. OLEDs using these films as the active emissive layers were fabricated and their current-voltage-luminance characteristics were determined. 1. L. C. Picciolo, H. Murata and Z. H. Kafafi, Appl. Phys. Lett. 78, 2378 (2001)  |
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