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Impedance spectroscopy of a poly(p-phenylenevinylene)-based light-emitting diode device

✍ Scribed by S.H. Kim; J.W. Jang; K.W. Lee; Cheol Eui Lee; S.W. Kim

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
112 KB
Volume
128
Category
Article
ISSN
0038-1098

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✦ Synopsis

A poly-p-phenylenevinylene (PPV)-based light-emitting diode (LED) device was studied by means of comprehensive ac impedance measurements. Separate regions of frequency-dependent responses, the bulk and depleted (interface) regions, with distinct electrical properties, were identified and characterized. The ac J -E characteristics revealed the space-charge limited conduction mechanism, which was specifically assigned to the depleted region. Besides, a direct estimate of the trap density in the bulk region was obtained from the applied voltage dependence of the charge concentration.

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Dedicated to Professor Erich Krnutr on the occusion of his 85th birthday ( ) VCH &,r/ug~gi,wllsihaft mDH W-6940 Weinhefm 1992 (J935-Y64K/92/0101-0036 $ 3 SO+ 25/0 Adv Mutcr 4 (1992) No 1