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Steady-state PL spectra (dashed line) and ASE emission spectra (solid line) of neat bisfluorene-cored dendrimer films. The spectra were normalized at their peak wavelength. In the insets are shown the chemical structure of the dendrimers and their photoluminescence quantum yield (PLQY) values measured in the solid state. -ethylhexyl.
Panel (a) shows the dependence of the full width at half maximum of the emission spectrum in ES as a function of the pump intensity. Panel (b) shows the total emission intensity from the edge of the BP dendrimer waveguide (integrated over all wavelengths) vs pump intensity. The excitation wavelength was . Panel (c) displays the ASE intensity as a function of pump energy and stripe length in the neat film of BPCz. Solid lines are the fits obtained. Panel (d) shows the intensity of ASE vs the distance between the pump stripe and the edge of the sample. Solid lines are the fit obtained from a single exponential decay function.
ASE threshold (solid squares), net gain measured at a pump energy of (open squares), and loss coefficient (open triangles) as a function of the PLQY value in the solid state. The dashed lines are guides for the eyes. The cross symbols correspond to the net gain calculated from the PLQY values.
Output of a (BP) dendrimer DFB laser.
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