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2 February 2001 Electroluminescence of bilayer light-emitting diodes of poly(vinylcarbazole) and vacuum-deposited poly(p-phenylene) thin films
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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.
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Giwook Kang, Changhee Lee, Won-Jun Song, and Chang Seoul "Electroluminescence of bilayer light-emitting diodes of poly(vinylcarbazole) and vacuum-deposited poly(p-phenylene) thin films", Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); https://doi.org/10.1117/12.416917
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