Angular Dependence of the Sharply Directed Emission in Organic Light Emitting Diodes with a Microcavity Structure

概要

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An optical microcavity structure was used in organic light emitting diodes. We succeeded in fabricating a device with sharply directed emission vertical to an emission surface. The device shows green emission (bright green) at normal position which turns red (bright red) at the 30° position. The angular dependences of the electroluminescence and the emission patterns versus viewing angle in the microcavity OLED were studied. The resonance wavelength λ decreases with viewing angle. The emission peak at 490nm is directed vertically to the device surface more sharply than that at 632nm. The microcavity structure shows non-Lambertian emission. The spectra appear more blue off-axis and the intensity of the green-like emission decreases rapidly with increasing viewing angle. A significantly narrow linewidth of 7.4nm in the 0° direction for the 490nm peak was observed. The full-widths at half maximum (FWHM) of the green-like spectra are much smaller than those of the red-like ones, indicating better cavity quality. [DOI: 10.1143/JJAP.41.2787]
社団法人応用物理学会の論文
2002-04-30