Synthesis and Luminescent Properties of Novel Dibenzo[a,c]phenazine Derivatives with Electron-Donating Side-Arms

Abstract

Three types of dibenzo[a,c]phenazine (dbpz) derivatives 1a–c, bearing a pair of fluorene side-arms at different positions from one another, were newly synthesized, and their photoluminescence properties were investigated. They exhibited efficient fluorescence based on the intramolecular charge transfer (ICT) transitions. Especially, the compound 1a, bearing the side-arms at the 10,13-positions, was more emissive than the other two, emitting greenish yellow in PMMA thin film with the quantum yield of 0.62. Using 1a as an emitting dopant, a poly(9-vinylcarbazole)-based OLED was fabricated, and green electroluminescence from the dopant was obtained.