Electroluminescence From Polar Nonlinear Optical Chromophore With Low Turn-On Voltage

Structure property relationships have been studied for polar and non-polar electro-luminescent molecules. The polar chromophore with a large red-shift shows a lower turn-on voltage than its non-polar counterparts. The
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curves show characteristic diode behavior. The external quantum efficiency measurements for the polar molecule shows a four times higher quantum efficiency than the other molecules.