White OLEDs based on a novel Eu^III-tetrakis-β-diketonate doped into 4,4′-N,N′-dicarbazolebiphenyl as emitting material

Abstract

White OLEDs with an external quantum efficiency (EQE) of 2.8%, maximum brightness (<italic>L</italic>) of 1547 cd m⁻², current efficiency (<italic>η</italic>_c) of 5.14 cd A⁻¹ and power efficiency (<italic>η</italic>_p) of 2.53 lm W⁻¹ were fabricated using a newly developed Eu^III-tetrakis-β-diketonate compound.