Time-resolved measurements of the fluorescence of rhodamine B on semiconductor and glass surfaces

Journal Article · Thu Jul 18 04:00:00 EDT 1985 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100261a025· OSTI ID:6486884

Liang, Y; Goncalves, A M.P.

Time-correlated single-photon counting was used to investigate the fluorescence decay of rhodamine B at semiconductor-water and glass-water interfaces. All decays could be fit by the sum of two exponentials with lifetimes tau/sub 1/ (short) and tau/sub 2/ (long). At very low dye concentrations in solution (10/sup -7/ M) tau/sup 1/ = 0.41 ns and tau/sub 2/ = 1.4 ns for semiconductors (tin oxide and indium oxide), and tau/sub 1/ = 0.68 ns and tau/sub 2/ = 2.6 ns for glass. Experiments on dry surfaces prepared with 10/sup -7/ M rhodamine B solutions gave tau/sub 1/ values similar to those obtained for surface-solution samples, but tau/sub 2/ = 3.1 ns with both glass and semiconductor surfaces. Molecules which are capable of excited-state electron transfer to the semiconductor are assigned to glass, and tau/sub 2/ otherwise. Progressively shorter tau/sub 1/ values measured for SnO/sub 2/ with increasing dye concentrations are attributed to the effect of energy-transfer quenching. Treatment of SnO/sub 2/ surfaces in 1 M KCl solutions at pH 13 (reported to reduce the photocurrent yield by two orders of magnitude) had no effect on tau/sub 1/. No changes in tau/sub 1/ which could be attributed to enhanced electron transfer were found with supersensitizers (thiourea and hydroquinone), which are known to increase the photocurrent yield by as much as one order of magnitude. 27 references, 4 figures, 1 table.

• Research Organization: Temple Univ., Philadelphia, PA
• DOE Contract Number: AC02-81ER10881
• OSTI ID: 6486884
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:15; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AMINES
ANTITHYROID DRUGS
AROMATICS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CHALCOGENIDES
DATA
DRUGS
DYES
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FLUORESCENCE
GLASS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HORMONE ANTAGONISTS
HYDROGEN COMPOUNDS
INDIUM COMPOUNDS
INDIUM OXIDES
INFORMATION
INTERFACES
LIFETIME
LUMINESCENCE
MASSLESS PARTICLES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTONS
QUINONES
REAGENTS
RESOLUTION
RHODAMINES
THIOUREA
THIOUREAS
TIME RESOLUTION
TIMING PROPERTIES
TIN COMPOUNDS
TIN OXIDES
WATER