Luminescence enhancement of rhodamine 6G in sol-gel films containing silver aggregates

REISFELD, R., EYAL, M., BRUSILOVSKY, D

CHEMICAL PHYSICS LETTERS

ELSEVIER SCIENCE BV

Año: 1988 vol. 153

0009-2614

Spectroscopic properties and lifetimes of a luminescent dye, rhodamine 6G (Rh6G), incorporated into films of sol-gel glasses in the presence of silver aggregates have been studied. The intensity of luminescence is dependent on the preparation conditions and up to a twofold enhancement of steady-state luminescence has been observed. The lifetime of Rh6G in sol-gel films is 2.9 k 0.1 ns and its decay curve is exponential, while the decay curves of Rh6G in the presence of silver show a deviation from exponential@ at short (0.2-0.3 ns) times, becoming exponential with a lifetime of 2.8 + 0.2 ns at longer times. The presence of silver aggregates causes substantial depolarization of the luminescence.