Highly efficient blue organic light-emitting devices incorporating a composite hole transport layer

Abstract

Organic light-emitting devices (OLEDs) incorporating the copper phthalocyanine (CuPc)/N,N'-bis-(1-naphthyl)-N,N'-diphenyl, 1,1'-biphenyl-4,4'-diamine (NPB) composite hole transport layer (c-HTL) have been fabricated. Under optimal condition, the amino-subsituted distyrlarylene fluorescent dye (DSA-Ph), doped in the stabel diarylanthracene blue host (MADN) achieved a luminance efficiency of 16.2 cd/A with a CIEx,y color coordinate of [0.15, 0.29] at 6.44 V (20 mA/cm(2)), which is one of the best ever reported to date.