Synthesis and electroluminescent characterization of a symmetric starburst orange-red light material

A new symmetric starburst orange-red light material, tris(4-(2-(N-butyl-1,8-naphthalimide)ethynyl)phenyl)amine (TNGT), was designed and synthesized. It shows a high fluorescence quantum yield and a slight concentration-quenching effect. A high brightness (6600 cd/m2) and a high current efficiency [4.57 cd/A (at 420 cd/m2)] with CIE (0.59, 0.40) were achieved at a relatively high doping concentration (20 wt%) in a TNGT-based OLED. - Highlight: ► A symmetric starburst orange-red light material TNGT was designed and synthesized.► TNGT demonstrates a diminished concentration-quenching effect in both PL and EL.► By the way of doping TNGT in a PVK emissive layer, the device was fabricated.► The device showed a high current efficiency of 4.57 cd/A with CIE (0.59, 0.40).