Ultrawide tuning range in doped organic solid-state lasers

We report on the tunability of 4-(Dicyanomethylene)-2-methyl-6-(julolidin-4-yl-vinyl)-4H-pyran (DCM2)-doped guest-host organic lasers. As host materials Tris-(8-hydroxy-quinoline)aluminum (Alq(3)), 4,4(')-N,N-'-dicarbazole-bipheny1 (CBP), and (NN)-N-'-di(1-naphthyl)-N,N-'-diphenyl-1,1(')-diphenyl-4,4(')-diamine (NPD) are used. The largest tuning range was observed in the Alq(3):DCM2 film with 115.3 nm between 597.8 and 713.1 nm. In CBP:DCM2, a tuning range of 85 nm was measured, whereas in NPD:DCM2 only one laser wavelength at 624.4 nm could be observed. When comparing the pump energies, we observed considerably lower threshold energy densities in Alq(3):DCM2 and CBP:DCM2 compared to NPD:DCM2. (C) 2004 American Institute of Physics.