Laser operation in nondoped thin films made of a small-molecule organic red-emitter

Rabbani-Haghighi, Hadi; Forget, Sébastien; Chénais, Sébastien; Siove, Alain; Castex, Marie-Claude; Ishow, Elena
July 2009
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p033305
Academic Journal
Stimulated emission in small-molecule organic films at a high dye concentration is generally hindered by fluorescence quenching, especially in the red region of the spectrum. Here we demonstrate the achievement of high net gains (up to 50 cm-1) around 640 nm in thermally evaporated nondoped films of 4-di(4′-tert-butylbiphenyl-4-yl)amino-4′-dicyanovinylbenzene, which makes this material suitable for green-light pumped single mode organic lasers with low threshold and superior stability. Lasing effect is demonstrated in a distributed Bragg resonator configuration, as well as under the form of random lasing at high pump intensities.


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