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Chemical structure of the spiro derivatives 2,7-bis(biphenyl-4-yl)--di-tert-butyl-9,-spirobifluorene (host) and Spiro-DPVBi (guest) and photoluminescence spectrum of the host and absorption spectrum of the guest material.
ASE and photoluminescence spectra for different doping concentrations.
Laser emission spectra for different grating periods of second-order DFB lasers and photoluminescence spectra for the bulk material (dashed line), both normalized to unity for a pure film of the guest material (a) and for a doping concentration of 1.1% (b).
Effective refractive indices for pure host material (0%), pure guest material (100%), and a doped system of 1.1% (a); and the corresponding laser threshold energy densities (b).
Laser emission spectra for different grating periods of first-order DFB lasers with a doping concentration of 1.1 % (a) and characteristics of a first-order laser with a grating period (b).
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