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High-efficiency stacked white organic light-emitting diodes
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FIG. 1.

Molecular structures of the organic materials used for fabrication of blue and white organic light-emitting diodes and the device structures of single-unit (standard) and double-unit (stacked) OLED devices for blue and white emissions.

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FIG. 2.

Current-voltage-luminance characteristics of single-unit (standard) and double-unit (stacked) blue OLED devices.

Image of FIG. 3.

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FIG. 3.

Current-voltage-luminance characteristics of single-unit (standard) and double-unit (stacked) white OLED devices.

Image of FIG. 4.

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FIG. 4.

Electroluminescent spectra of single-unit (standard) and double-unit (stacked) blue and white OLED devices, which were measured at the current density of .

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/content/aip/journal/apl/92/4/10.1063/1.2837419
2008-01-29
2014-04-24

Abstract

We report efficient tandem white organic light-emitting diodes (WOLEDs) by using bathocuproine: as an effective interconnecting layer. We utilized two primary colors of sky blue and orange fluorescent emitters to obtain efficient white electroluminescence. Although single WOLEDs using two adjacent emitting layers showed a maximum current efficiency of with Commission Internationale d’Eclairage (CIE) coordinates of (0.28, 0.34), the tandem WOLED device made by stacking two single color OLEDs in series demonstrated doubled maximum current efficiency of with CIE coordinates of (0.28, 0.41). The stacking of different single color OLEDs in series instead of double stacking of WOLEDs can be useful to achieve highly efficient WOLEDs because it can reduce the number of layers of the devices.

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Scitation: High-efficiency stacked white organic light-emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/4/10.1063/1.2837419
10.1063/1.2837419
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