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 10nm when the pumping energy is 50μJ/pulse. The threshold for ASE is about 7.9μJ/pulse corresponding to 39.5kW∕cm2, 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 ∼33 and ∼3.9cm−1, respectively.