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High efficiency blue light emitting unipolar transistor incorporating multifunctional electrodes
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FIG. 1.

Molecular structure of emitter material (a) and scheme of bottom-contact device with multifunctional electrodes (b). PL (following 373 nm excitation) and electroluminescence spectra exhibit no deviation (c). Optical image of the device under operation shows deep blue emission (d).

Image of FIG. 2.

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FIG. 2.

Experimental data comparing light emission with output characteristics at various gate voltages (a) and the transfer characteristics at different drain voltages (b). EQE is calculated from transfer characteristics at different drain voltages (c).

Image of FIG. 3.

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FIG. 3.

Simulation of relocation of recombination zone under a drain voltage of for gate voltages of , , and , indicating a shift of the recombination area from organic/insulator interface in vertical direction and toward electrode with increasing gate voltage.

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2009-04-16
2014-04-19

Abstract

The authors report on blue light emitting unipolar organic light emitting transistors (OLETs) with external quantum efficiency up to 0.2% by using multifunctional Mg/Au electrodes formed in combination with an efficient light emitting fluorene derivative. A mobility up to has been achieved, which is comparable to previous results from time of flight mobility measurements. An anomalous light emission behavior is observed in unipolar OLETs. The phenomenon is discussed in light of the effects of electron injection and outcoupling efficiency, respectively. Our results show that the multifunctional electrodes are useful for implementing highly efficient unipolar OLETs.

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Scitation: High efficiency blue light emitting unipolar transistor incorporating multifunctional electrodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/15/10.1063/1.3109800
10.1063/1.3109800
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