17 December 1999 PVK-AlQ3 organic electroluminescent diodes: transport properties and color tuning via PVK doping
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Abstract
In this paper we report on Organic Light Emitting Diodes (OLEDs) based on heterojunctions between a polymer, Poly(N- vinylcarbazole) (PVK) as hole transport layer (HTL) and an evaporated layer of Tris (8-Hydroxy)quinoline) Aluminum (Alq3) as electron transport layer (ETL) and emissive layer (EM). The electrical properties of ITO/PVK/Alq3/Mg-Ag were thoroughly investigated and Trapped Charges Limited (TCL) currents were shown to be the main transport process in these devices. In order to assess the pertinence of PVK as HTL, a comparison with other HTL deposited by vacuum evaporation was carried out. The color of the emitted light then could have been tuned by adding DCM in PVK. Light emitted by Alq3 was partly absorbed by DCM thus exciting the photoluminescence of DCM. Exiting light was thus a combination of green-yellow characteristic of Alq3 and of red-orange due to DCM. Wavelengths spanning the range 530-620 nm were obtained for DCM concentrations in PVK up to 20% wt. without significant degradation of the external quantum yield.
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Laurent Berthelot, Laurent Berthelot, Jacques Tardy, Jacques Tardy, Bruno Masenelli, Bruno Masenelli, Jacques Joseph, Jacques Joseph, } "PVK-AlQ3 organic electroluminescent diodes: transport properties and color tuning via PVK doping", Proc. SPIE 3797, Organic Light-Emitting Materials and Devices III, (17 December 1999); doi: 10.1117/12.372737; https://doi.org/10.1117/12.372737
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