Amplified spontaneous emission and lasing properties of bisfluorene-cored dendrimers

A study of the amplified spontaneous emission (ASE) properties of three bisfluorene-cored dendrimers in the solid state is reported. The results show that the dendron type has a strong impact on the photoluminescence quantum yield and affects the ASE threshold, the optical gain, and loss coefficients. Optically pumped distributed feedback lasers operating in the blue spectral region were fabricated by spin coating the dendrimer films on top of a two-dimensional corrugated fused silica substrate. A best lasing threshold of 4.5 mu J/cm(2) and a slope efficiency of 8.3% were obtained, which demonstrate the high potential of these materials for laser applications. (c) 2007 American Institute of Physics.