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Efficient multiple triplet quantum well structures in organic light-emitting devices
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Figures

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FIG. 1.

(a) Energy band diagrams of fabricated red PHOLEDs with MQW structures. (b) Triplet energies of used materials in present study.

Image of FIG. 2.

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FIG. 2.

EQE characteristics of fabricated red PHOLEDs with and without CCL. Inset: The current density difference between single QW and double QW devices vs hole barriers of different CCLs.

Image of FIG. 3.

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FIG. 3.

characteristics of fabricated red PHOLEDs with increasing R-EL unit from one to five.

Image of FIG. 4.

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FIG. 4.

Maximum EQE characteristics of fabricated five red PHOLEDs with increasing R-EL unit from one to five. Inset: Over-flowing ratios of hole carriers with increasing R-EL units.

Tables

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Table I.

Summary of performances of MQW red PHOLEDs in this study.

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/content/aip/journal/apl/95/10/10.1063/1.3224190
2009-09-08
2014-04-16

Abstract

We demonstrate the multiple quantum well(MQW) structures with the charge control layers (CCLs) to produce highly efficient red phosphorescent organic light-emitting devices(OLEDs). Various triplet quantum well devices from a single to five quantum wells are realized using wide band-gap hole and electron transporting layers, narrow band-gap host and dopant materials, and CCLs. Triplet energies in such MQW devices are confined at the emitting layers. The maximum external quantum efficiency of 14.8% with a two quantum well device structure is obtained. The described MQW device concept has been proposed to be very useful to future OLED display and lighting applications.

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Scitation: Efficient multiple triplet quantum well structures in organic light-emitting devices
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/10/10.1063/1.3224190
10.1063/1.3224190
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