Europium complex for organic electroluminescent devices with sharp red emission

Abstract

A volatile Eu complex, Eu (TTA)_3phen (TTA; thenoyltrifluoroacetone, phen; 1,10-phenanthroline), was synthesized and applied to an electroluminescent (EL) cell structure of [ITO/hole transport layer/emitting layer (host material; azomethine zinc complex, and dopant; Eu (TTA)_3phen)/MgIn]. The emitting layer were formed by a codeposition technique. A red emission (EL peak wavelength; 614 nm) with a very sharp spactral band was observed from the EL cell with 5 wt% Eu(TTA)_3phen, and maximum luminance of 137 cd/m^2 was achieved.