Abstract
Photovoltaic (PV) effects for red bright organic light-emitting diodes(OLEDs) in which the red light emitted from the dopant4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) have beenobserved. The OLEDs show organic photovoltaic properties. At theoptimum doping concentration, the main eletroluminescence parametersincluding the maximum brightness and the maximum luminousefficiency under current density of 20 mA/cm2 are 3280 cd/m2and 1.54 cd/A, respectively. When irradiated by a 365-nmUV-light (4 mW/cm2), the device exhibits the PV parameters of theopen-circuit voltage 1.4 V, short-circuit current 2.9 μA/cm2,fill factor 0.22, and power conversion efficiency 0.022%. Effects ofevery organic layer, especially the doped DCJTB on the PV performance,are also discussed. It is expected that the research for the PVproperty of the small molecular doping OLEDs will be of benefit for flatpanel display technology in the future.
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