title: Quenching of electronically excited N2molecules and Tb3+/Eu3+ions by polyatomic sulfur-containing gases upon triboluminescence of inorganic lanthanide salts.
abstract: The triboluminescence of Eu2(SO4)3·8H2O and Tb2(SO4)3·8H2O crystals in an atmosphere of sulfur dioxide (SO2) or sulfur hexafluoride (SF6) was studied. Quenching of the gaseous (emitter N2) and solid-state (emitter Ln3+) components of the triboluminescence (TL) emission spectrum was seen when compared with the TL spectra of the crystals in air. One reason for the quenching is a reduction in the effective charge both on the crystal surface and in micro-cracks under an SO2or SF6atmosphere, leading to a decrease in the probability of electrical breakdown and a reduction in electric field strength responsible for the electroluminescence excitation of lanthanide ions in TL. In an SO2atmosphere, there is an additional mode of quenching, as confirmed by quenching of the crystal photoluminescence (emitter Ln3+). It is supposed that this quenching is due to an exchange of energy on electronic excitation of the lanthanide ions to the vibrational sublevels of the SO2molecules adsorbed on the crystal surface. Another additional channel of TL quenching originates from non-radiative transfer of excitation energy during collisions between the *N2and SO2molecules in the gaseous phase.
authors.affiliation: Institute of Petrochemistry and Catalysis of Russian Academy of Sciences, Ufa, Russian Federation.
authors.forename: G L
authors.initials: GL
authors.lastname: Sharipov
authors.affiliation: Institute of Petrochemistry and Catalysis of Russian Academy of Sciences, Ufa, Russian Federation.
authors.forename: A A
authors.initials: AA
authors.lastname: Tukhbatullin
authors.affiliation: Institute of Petrochemistry and Catalysis of Russian Academy of Sciences, Ufa, Russian Federation.
authors.forename: A R
authors.initials: AR
authors.lastname: Bagautdinova
mesh_terms: D003460:Crystallization; D005063:Europium / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry; D005740:Gases / Q000737:chemistry; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods; D009584:Nitrogen / Q000737:chemistry; D012492:Salts; D013457:Sulfur Compounds / Q000737:chemistry; D013458:Sulfur Dioxide / Q000737:chemistry; D013725:Terbium / Q000737:chemistry*
chemical_list: D005740:Gases; D049408:Luminescent Agents; D012492:Salts; D013457:Sulfur Compounds; C523090:sulfur fluoride; D013725:Terbium; D013458:Sulfur Dioxide; D005063:Europium; D009584:Nitrogen; D005459:Fluorides
keywords: SF6 and SO2; lanthanide; quenching; triboluminescence