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In this study, the optical gain coefficient due to spontaneous emission for the conjugated compound 1-(4’-(diphenylamino)-[1,1’-biphenyl]-4-yl)ethanone (DBE) in two solvents, Tetrahydrofuran (THF) and Dichloromethane (DCM) was investigated using the variable stripe length method. The solutions were placed in 10 mm cuvettes and pumped optically with N2 laser (337 nm) with pulse duration of 1.2 ns and repetition rate of 10 Hz. A maximum net gain of 12 cm−1 for the compound in THF, and 7 cm−1 for the compound in DCM were recorded at the input energy of 162 μJ. The fluorescence quantum yields (∅f) of the compound were determined at the excitation wavelength of 337 nm using coumarin as a standard. The values of (∅f) for the samples in DCM and THF solvents were found to be 0.68 and 0.61, respectively. The high values of quantum yields suggest the possibility of using this material as an active media for lasing and for LED.

Optical Gain Coefficient Measurements for 1-(4’-(Diphenylamino)-[1,1’-biphenyl]-4-yl)ethanone