Amplified spontaneous emission from cyano substituted oligo(p-phenylene vinylene) single crystal with very high photoluminescent efficiency

Amplified spontaneous emission (ASE) from high-quality crystal of cyano substituted oligo(p-phenylene vinylene) with very high photoluminescent efficiency is observed. The full widths at half maximum of the narrowed spectra can reach 10 nm when the pumping energy is 50 mu J/pulse. The threshold for ASE is about 7.9 mu J/pulse corresponding to 39.5 kW/cm(2), which is among the lowest values for organic crystals ever reported. The gain coefficient at the peak wavelength of ASE and loss coefficient caused by scattering are similar to 33 and similar to 3.9 cm(-1), respectively.