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High contrast tandem organic light emitting devices
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FIG. 1.

Schematic diagram illustrating the design of the high contrast tandem OLED. The structures and photographs of (a) a conventional single cell OLED (device 1), (b) the single cell OLED with a phase tuning layer (device 2), and (c) the proposed high contrast tandem OLED (device 3) illuminated with ambient light.

Image of FIG. 2.

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FIG. 2.

(a) B-J characteristics of three devices, namely, device 1: single-cell OLED, device 2: high contrast OLED with the PT layer, and device 3: proposed high contrast tandem OLED. (b) Energy diagrams for device 2 and device 3 at the interface between the intermediate layers and the PT layer. Charge-to-photon processes for (c) a single-cell based OLED and (d) a tandem OLED.

Image of FIG. 3.

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FIG. 3.

EL spectrum of device 4 with two different emissive materials.

Image of FIG. 4.

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FIG. 4.

characteristics of devices 1, 2, and 3.

Image of FIG. 5.

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FIG. 5.

(a) Reflectivity of devices 1, 2, and 3, and (b) refractive indices of NPB and Alq.

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/content/aip/journal/apl/101/13/10.1063/1.4755784
2012-09-27
2014-04-20

Abstract

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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Scitation: High contrast tandem organic light emitting devices
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/13/10.1063/1.4755784
10.1063/1.4755784
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