Luminescence properties and growth of pure and anthracene‐doped naphthalene crystals

Abstract

AbstractPure and anthracene‐doped naphthalene crystals of high quality with 20 mm diameter and 60 mm length have been grown by the self‐seeded vertical Bridgman method. The powder X‐ray diffraction studies and the Raman analysis show that the guest molecules appear as defects in the form of irregularly oriented molecules that do not significantly distort the monoclinic structure. The absorbance and fluorescence studies show high Stoke's shift for anthracene‐doped naphthalene crystals. From this we deduce that the exciting wavelength of the light (270 nm) is completely absorbed by the naphthalene, so that fluorescence from anthracene takes place as a result of energy transfer from naphthalene. The decay time observed for anthracene‐doped naphthalene is 27 ± 2 ns. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)