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A new molecular design based on hybridized local and charge transfer fluorescence for highly efficient (>6%)
Rajendra Kumar Konidena1, K R Justin Thomas, Deepak Kumar Dubey
1Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India. krjt8fcy@iitr.ac.in.
Chemical Communications (Cambridge, England)
|October 17, 2017
Abstract:
A deep-blue emitter was developed by modifying carbazole nuclear positions C2 & C7 with a triphenylamine donor and C3 & C6 with a cyano acceptor. The molecular design features cross-conjugated localized and charge transfer chromophores which results in a hybridized local charge transfer (HLCT) excited state. An organic light emitting diode (OLED) using this material exhibited high external quantum efficiency (6.5%) with excellent color saturation (CIEy ∼ 0.06) and small full-width at half maximum (48 nm).