Abstract
The present study focuses on the photoluminescence and electroluminescence properties of a new fluorescent red emitter based on a derivative of a polyaromatic hydrocarbon. 6,13-diphenylpentacene has a very narrow emission spectrum giving rise to a saturated red color with excellent chromaticity coordinates (x equals 0.64 and y equals 0.34) in accordance with the Commission Internationale de L'Eclairage (CIE). Efficient organic electroluminescent devices with saturated red emission were developed using a composite of 6,13-diphenylpentacene and Alq<SUB>3</SUB> as the active emissive layer. An electroluminescence quantum efficiency of 1.4% at 100 A/m<SUP>2</SUP>, close to the theoretical limit (1.5%) (based on the measured fluorescence quantum yield, (phi) <SUB>pl</SUB> equals 30%, of the emitting layer) was measured for an unoptimized device structure that consists of the emissive layer sandwiched between hole and electron transport layers. In addition, the quantum efficiencies of the pentacene-based devices are stable over a wide range of current densities (1 to 1000 A/m<SUP>2</SUP>).
Published Version
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