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Proceedings Paper

Electroluminescence of bilayer light-emitting diodes of poly(vinylcarbazole) and vacuum-deposited poly(p-phenylene) thin films
Author(s): Giwook Kang; Changhee Lee; Won-Jun Song; Chang Seoul
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Paper Abstract

We present electroluminescence (EL) studies of bilayer organic light-emitting diodes formed from poly(N- vinylcarbazole) (PVK) and the vacuum-deposited poly(p- phenylene) (PPP). The ITO/PPP/Al devices show EL spectra with a blue emission peak around 450 nm, very similar with the photoluminescence (PL) spectra of PPP. However, the EL spectra of the ITO/PVK/PPP/Al devices show a broad shoulder around 550 nm, which is dependent upon the bias voltage, as well as the peaks at the shorter-wavelength region originating from the PPP layer. The shoulder around 550 nm becomes more pronounced at the low bias voltage while the EL peaks originating from PPP become stronger with increasing bias voltages. This behavior can be accounted by exciplex formation at the interface between PVK and PPP. The current- voltage-luminescence characteristics and the quantum efficiency of both devices are almost independent of temperature in the temperature range between 15 and 300 K, indicating a tunneling mechanism for charge carrier injection.

Paper Details

Date Published: 2 February 2001
PDF: 8 pages
Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); doi: 10.1117/12.416917
Show Author Affiliations
Giwook Kang, Inha Univ. (South Korea)
Changhee Lee, Inha Univ. and Dongguk Univ. (South Korea)
Won-Jun Song, Inha Univ. (South Korea)
Chang Seoul, Inha Univ. (South Korea)


Published in SPIE Proceedings Vol. 4105:
Organic Light-Emitting Materials and Devices IV
Zakya H. Kafafi, Editor(s)

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