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Keywords:

  • thiophene/phenylene;
  • co-oligomers;
  • cyano-substituted groups;
  • room temperature lasing;
  • lasing;
  • triclinic crystals;
  • differential transmission spectroscopy
Thumbnail image of graphical abstract

Room temperature optically pumped lasing is achieved for a new n-type molecular crystal of 2,5-bis(4′-cyanobiphenyl-4-yl)­thiophene (BP1T-CN). Efficient stimulated emission in the Fabry–Pérot crystal cavity is supported with a high group refractive index (4.18–4.98), Q factor (910–1860), material gain coefficient (120 cm-1), and a high stimulated emission rate demonstrated by pump–probe measurements.