Synthesis and Photophysical Properties of Carbazole-Based Blue Light-Emitting Dendrimers

摘要

A new class of highly fluorescent and stable carbazole-based dendrimers (1-5) that contain the ethynylbenzene and diethynylbenzene cores has been synthesized and characterized. They show very high extinction coefficients of absorption (A_(max) ≈ 328—353 nm) and high quantum yields of fluorescence (λ_(max) ≈386-437 nm; Φ_F ≈ 0.72-0.89; τ_F ≈ 2.09-3.91 ns) in dichloromethane. The quantum yields of fluorescence of 1-5 in the solid state are equally high (λ_(max)≈ 385—422 nm; Φ_F ≈ 0.40—0.85). These data indicate their potential use as blue-emitting materials in organic light-emitting diodes (OLEDs).