KYF(4):Pr(3+) was prepared in the two forms of single crystal and polycrystalline powder. The visible photoluminescence properties of KYF(4):Pr(3+) single crystal and powder have been comparatively investigated, and the special attentions were paid to the luminescence in the red region from the f-f transition of Pr(3+) (3)P(0) and (1)D(2) states. We used two different pump sources of an Argon-ion laser tuned to a wavelength of 457.9 nm, 445 nm and a blue GaN laser diode emitting at 445 nm, exciting the (3)P(1) and (3)P(2) states of Pr(3+) ion, respectively. The observed strong and sharp emission line at 594.6 nm for the KYF(4):Pr(3+) powder and crystal should be ascribed to (3)P(0)-(3)H(6) transition of Pr(3+), and an increase in the 3P0 emission upon 457.9 nm excitation was also observed and was attributed to the [(3)P(0),(3)H(4)] -> [(3)H(6), (1)D(2)] cross-relaxation mechanism. Further study on room temperature lifetime and temperature-dependent fluorescence emission of (1)D(2)-(3)H(4) and (3)P(0)-(3)H(6) transitions indicated that there was obvious lifetime difference for the (1)D(2) and (3)P(0) states of Pr(3+) in the present KYF(4) host.
Luminescence study of the f-f transition of Pr(3+) (1)D(2) and (3)P(0) states in KYF(4) crystals and powders
TONELLI, MAURO
2011-01-01
Abstract
KYF(4):Pr(3+) was prepared in the two forms of single crystal and polycrystalline powder. The visible photoluminescence properties of KYF(4):Pr(3+) single crystal and powder have been comparatively investigated, and the special attentions were paid to the luminescence in the red region from the f-f transition of Pr(3+) (3)P(0) and (1)D(2) states. We used two different pump sources of an Argon-ion laser tuned to a wavelength of 457.9 nm, 445 nm and a blue GaN laser diode emitting at 445 nm, exciting the (3)P(1) and (3)P(2) states of Pr(3+) ion, respectively. The observed strong and sharp emission line at 594.6 nm for the KYF(4):Pr(3+) powder and crystal should be ascribed to (3)P(0)-(3)H(6) transition of Pr(3+), and an increase in the 3P0 emission upon 457.9 nm excitation was also observed and was attributed to the [(3)P(0),(3)H(4)] -> [(3)H(6), (1)D(2)] cross-relaxation mechanism. Further study on room temperature lifetime and temperature-dependent fluorescence emission of (1)D(2)-(3)H(4) and (3)P(0)-(3)H(6) transitions indicated that there was obvious lifetime difference for the (1)D(2) and (3)P(0) states of Pr(3+) in the present KYF(4) host.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
