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Highly efficient, deep-blue phosphorescent organic light emitting diodes with a double-emitting layer structure
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FIG. 1.

Transient photoluminescent decay for a Ad-Cz film with FIr6, and the molecular structure of Ad-Cz.

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FIG. 2.

External quantum efficiency vs. current density for two types of FIr6-based OLED devices. One is a SEL device and the other is a DEL device.

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FIG. 3.

EL spectra for two types of FIr6-based OLED devices. The fluorescent spectrum of Ad-Cz is also shown.

Image of FIG. 4.

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FIG. 4.

Structure of DEL OLED device and the assumed energy diagram.

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/content/aip/journal/apl/93/13/10.1063/1.2996572
2008-10-03
2014-04-18

Abstract

We have demonstrated a highly efficient, deep-blue organic light-emitting diode(OLED) using a host material with a high triplet energy. The OLED device that we have prepared utilizes a phosphorescent guest material, iridium(III)bis(,-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate, exhibits a peak quantum efficiency of about 15.7%. We employed a double-emitting layer (DEL) structure that distributes the carrier recombination region within the device. In this DEL structure, the emission mechanism is such that the energy transfers from the host material in one emitting layer, and the other emitting layer provides for direct charge trapping in the guest material. This DEL structure proved to be quite useful in achieving the reported device characteristics.

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Scitation: Highly efficient, deep-blue phosphorescent organic light emitting diodes with a double-emitting layer structure
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/13/10.1063/1.2996572
10.1063/1.2996572
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