Near-infrared single-photons from aligned molecules in ultrathin crystalline films at room temperature C. Toninelli $^{1}$, K. Early1$_{,}$$^{2}$, J. Bremi$^{1}$, A. Renn$^{1}$, S. G¨ otzinger $^{1}$, and V. Sandoghdar1 $^{1}$Laboratory of Physical Chemistry and optETH, ETH Z¨ urich, CH-8093 Z¨ urich, Switzerland $^{2}$The George Richardson, Jr. Chemistry Research Laboratory, Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA We investigate the optical properties of Dibenzoterrylene (DBT) molecules in a spin-coated crystalline film of anthracence. By performing single molecule studies, we show that the dipole moments of the DBT molecules are oriented parallel to the plane of the film. Despite a film thickness of only 20 nm, we observe an exceptional photostability at room temperature and photon count rates around 10 6 per second from a single molecule. These properties together with an emission wavelength around 800 nm make this system attractive for applications in nanophotonics and quantum optics. PACS numbers: 1 arXiv:1002.0920v1 [quant-ph] 4 Feb 2010 Abstract