Nondoped phosphorescent organic quantum well light-emitting device based on iridium complex: Synthesis, characterization, photophysical property, and electroluminescence performance

► A high efficiency phosphorescent Ir(III) emitter is synthesized. ► Its structure, nature, and properties are well studied and characterized. ► Multiple quantum well structured devices are fabricated. ► A maximum current efficiency of 31.5 cd/A is realized. ► The efficiency roll-off is efficiently reduced.