Extremely Low Amplified Spontaneous Emission Threshold And Blue Electroluminescence From A Spin-Coated Octafluorene Neat Film

We report on the photophysical, amplified spontaneous emission (ASE), and electroluminescence properties of a blue-emitting octafluorene derivative in spin-coated films. The neat film shows an extremely low ASE threshold of 90 nJ/cm(2), which is related to its high photoluminescence quantum yield of 87% and its large radiative decay rate of 1.7 x 10(9) s(-1). Low-threshold organic distributed feedback semiconductor lasers and fluorescent organic light-emitting diodes with a maximum external quantum efficiency as high as 4.4% are then demonstrated, providing evidence that this octafluorene derivative is a promising candidate for organic laser applications. Published by AIP Publishing.