Symmetric light emitting devices from poly(p‐di ethynylene phenylene) (p‐di phenylene vinylene) derivatives
作者:
S. A. Jeglinski,
O. Amir,
X. Wei,
Z. V. Vardeny,
J. Shinar,
T. Cerkvenik,
W. Chen,
T. J. Barton,
期刊:
Applied Physics Letters
(AIP Available online 1995)
卷期:
Volume 67,
issue 26
页码: 3960-3962
ISSN:0003-6951
年代: 1995
DOI:10.1063/1.114418
出版商: AIP
数据来源: AIP
摘要:
Light emitting devices were fabricated from 2,5‐dialkoxy derivatives of poly(p‐di ethynylene phenylene‐p‐di phenylene vinylene) (PDEPDPV) sandwiched between indium tin oxide (ITO) and Al. The current–voltage (I–V) curve, electroluminescence (EL) intensity‐voltage (IEL–V) curve, and the EL spectra were identical in forward and reverse bias. TheI–Vcurves were also symmetric under illumination, withI≊0 andV=0, suggesting a negligibly small internal electric field. At high bias voltage, carrier injection was found to be dominated by tunneling at the interfaces. At low bias voltage, tunneling among localized states at the Fermi level prevailed. The behavior is discussed in relation to Fermi‐level pinning at defect states in the interfaces with the ITO and Al. ©1995 American Institute of Physics.
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