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High contrast tandem organic light emitting devices
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A high contrast-ratio organic light emitting device (OLED) is proposed and experimentally demonstrated. The OLED is implemented by stacking two organic phase tuning (PT) layers between composite metal layers and optimizing their thicknesses. Such a tandem device can increase the current efficiency by 98%, and reduce the operating voltage by 1.04 V, in comparison to conventional high contrast OLEDs. Measured reflection spectra validate the high-contrast capability of the OLED, and demonstrate experimentally an average reflectivity of 6% under ambient light illumination. This is the lowest reflectivity reported to date for OLEDs employing organic phase tuning layers.
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