High hole mobility through charge recombination interface in organic light-emitting diodes

We report the effects of non-radiative charge recombination interface resulting on high hole mobility and low driving voltage characteristics in organic light-emitting devices. These effects are demonstrated in the following device architecture: hole transporting layer (HTL)/extremely deep LUMO (low...

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Bibliographic Details
Published in:Synthetic metals 2011-10, Vol.161 (19-20), p.2087-2091
Main Authors: Diouf, Baye Boucar, Jeon, Woo Sik, Park, Jung Soo, Choi, Jin Woo, Son, Young Hoon, Lim, Dae Chul, Doh, Yoo Jin, Kwon, Jang Hyuk
Format: Article
Language:English
Subjects:
Applied sciences
Charge
Charge recombination
Coulombic interaction
Devices
Driving voltage
Electric charge
Electron mobility
Electronics
Exact sciences and technology
Hole mobility
Interface
Mobility
Molecular orbitals
Optoelectronic devices
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Transporting
Voltage
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Summary:We report the effects of non-radiative charge recombination interface resulting on high hole mobility and low driving voltage characteristics in organic light-emitting devices. These effects are demonstrated in the following device architecture: hole transporting layer (HTL)/extremely deep LUMO (lowest unoccupied molecular orbital) electron transporting layer (ETL)/HTL. The extremely small gap between the high HOMO (highest occupied molecular orbital) of the HTL and the deep LUMO of the ETL leads to facilitate the hole conduction through charge recombination at the interface. The excellent hole mobility of 4.7×10−1cm2/Vs in this device configuration is measured by the space charge limited current method with an electric field of 0.1MV/cm. We suggest that such a high hole mobility is attributed to the rapid coulombic interaction at the charge recombination interface in addition to the hole and electron mobilities of the individual HTL and ETL, respectively.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2011.07.025