Cross Relaxation and Energy Transfer in Cs_{2}NaSm_{x}Eu_{y}Y_{1-x-y}Cl_{6}

• Authors: T. Luxbacher , H. Fritzer , C. Flint
• Languages of publication: EN

Abstracts

EN

Luminescence decay curves have been measured for the Sm^{3+} ^{4}G_{5/2} → ^{6}H_{7/2} emission in the cubic crystal Cs_{2}NaSm_{x}Eu_{y}Y_{1-x-y}Cl_{6} (x = 0.005 to x = 1, y = 0 to y = 0.99) over the temperature range 10 K to 300 K using pulsed laser excitation into the ^{4}G_{5/2} state of Sm^{3+}. The luminescence from the ^{4}G_{5/2} state of Sm^{3+} is strongly quenched by both, cross relaxation to nearest-neighbour Sm^{3+} ions and energy transfer to the ^{5}D_{0} state of Eu^{3+}. We interpret these processes in terms of a recently developed discrete shell model. The dependence of energy transfer from the Sm^{3+} donor ion to Eu^{3+} acceptor ions on y is readily studied and modelled. The temperature dependence shows that the cross relaxation occurs mainly by electric dipole vibronic-electric dipole vibronic interaction while in the energy-transfer process magnetic dipole allowed electronic contributions are also involved.

Keywords

EN

33.5.-j; 34.50.Gb; 78.55.Hx

Discipline

• 34.50.Gb: Electronic excitation and ionization of molecules
• 78.55.Hx: Other solid inorganic materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1996
• Volume: 90
• Issue: 1
• Pages: 161-168

Dates

published

1996-07

Contributors

author

T. Luxbacher

• Institut für Physikalische und Theoretische Chemie, Technische Universität Graz, 8010 Graz, Austria

author

H. Fritzer

• Institut für Physikalische und Theoretische Chemie, Technische Universität Graz, 8010 Graz, Austria

author

C. Flint

• Laser Laboratory, Department of Chemistry, Birkbeck College, 29, Gordon Square, London WC1H 0PP, U.K.

Identifiers

DOI

10.12693/APhysPolA.90.161