Electroluminescence and Electrical Properties of White-OLEDs Studied by Dc and Ac Measurements

White-OLEDs were made by thermal evaporation using NPB (N, N’-Bis (naphthalen-1-yl)-N, N’-bis (phenyl) benzidine) doped with DCM1 (4 - (Dicyanomethylene) – 2 – methyl – 6 - (4 -dimethylaminostyryl)-4H-pyran) in a single layer with two emitters. The electroluminescent emission has a CIE (x, y) color...

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Bibliographic Details
Main Authors: Costa, J., Pereira, L.
Format: Conference Proceeding
Language:English
Subjects:
doping
Electrical properties
Electroluminescence
White-OLED
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Summary:White-OLEDs were made by thermal evaporation using NPB (N, N’-Bis (naphthalen-1-yl)-N, N’-bis (phenyl) benzidine) doped with DCM1 (4 - (Dicyanomethylene) – 2 – methyl – 6 - (4 -dimethylaminostyryl)-4H-pyran) in a single layer with two emitters. The electroluminescent emission has a CIE (x, y) color coordinates of (0.32, 0.37) with a brightness around 350cd/m2 and a maximum luminous efficiency of 0.5cd / A in normal view direction. Under dc conditions the electroluminescence changes almost linearly with the applied voltage with no noticeable change in color coordinates. The ac electrical measurements show the relaxation frequencies in order of a hundred of kH and can be correlated with the parallel RC models associated to the emissive organic layer. The simulated electrical behavior shows a good balanced contribution for the two active layer emitters.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2015.04.003