Stimulated emission from organic semiconductor

摘要

Abstract: Optically pumped surface emitting and edge emitting stimulated emission behaviors in organic semiconductors was demonstrated in this study. For the surface emitting device, the microcavity was formed by sandwiching a polymer film containing PVK, Alq and DCM between a DBR with a reflectivity of 99.5 percent and a silver film. The sample was optically pumped by the three harmonic of a observed in DCM-doped PVK microcavity when pumped above the threshold intensity of 0.25MW/cm$+2$/. The full width at half maximum was 0.6 nm with the peak wavelength at 603nm. For the edge emitting device, a laser dye DCM doped Alq matrix wa used as the gain medium. The sample was transversely pumped by the three harmonic output of the mode-locked Nd:YAG laser. The change of the emission spectra showed a clear threshold action and gain narrowing phenomenon when increasing the excitation intensity. The spectra narrowing observe result from the amplified spontaneous emission in the gain material. !15