A New Orange-Light-Emitting Materials Based on (N-naphthyl)-1,8-naphthalimide for OLED Applications

Abstract

A new orange emitters consisting of 2-naphthalene-1-yl-benzo[de]isoquinoline-1, 3-dione (NBID) as core, and bulky diphenylamine or naphthylphenylamine substituted as a side units were synthesized and characterized. These compounds have a non-planar molecule conformation, donor-acceptor structure, and high thermal stability. Using these materials as dopant, we fabricated electroluminescence device with a structure of ITO/DNTPD/NPD/NBID-1, 2 (3 wt% in Alq(3))/Alq(3)/LiF/Al. The luminance-efficiency of NBID derivatives (1 and 2) were showed 6.6 cd/A and 5.9 cd/A, respectively. The orange emissions were observed with Commission International de I'Eclairage (CIE) coordinates of (0.46, 0.52) for NBID-1 and (0.48, 0.52) for NBID-2, respectively.