714 nm emission with 12.25% efficiency from iridium complexes with low iridium content by the strategy of rigid coordination core and amplifying shell

Abstract

A novel core–shell-typed Ir( iii ) complex with a rigid C^N coordinated core of DBPz and an amplifying peripheral shell of t BuTPA. Its doped OLEDs exhibited a 714 nm emission with an outstanding EQE of 12.25% and a recorded radiance emittance of 45 330 mW Sr −1 m −2 .