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Luminescence study of the f-f transition of Pr3+ 1D2 and 3P0 states in KYF4 crystals and powders

Z. XIA1,2,* , A ARCANGELI2, R. FAORO2, M. TONELLI2

Affiliation

  1. School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China
  2. NEST Nanoscience Institute CNR and Dipartimento di Fisica, Università di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy

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 Pr3+ 3P0 and 1D2 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 3P1 and 3P2 states of Pr3+ ion, respectively. The observed strong and sharp emission line at 594.6 nm for the KYF4:Pr3+ powder and crystal should be ascribed to 3P0-3H6 transition of Pr3+3+, and an increase in the 3P0 emission upon 457.9 nm excitation was also observed and was attributed to the [3P0,3H4] → [3H6,1D2] cross relaxation mechanism. Further study on room temperature lifetime and temperature-dependent fluorescence emission of 1D2-3H4 and 3P0-3H6 transitions indicated that there was obvious lifetime difference for the 1 D 2 and 3 P 0 states of Pr3+ in the present KYF 4 host..

Keywords

Optical materials, Single crystal, Luminescence, Fluoride crystal and power, KYF 4.

Citation

Z. XIA, A ARCANGELI, R. FAORO, M. TONELLI, Luminescence study of the f-f transition of Pr3+ 1D2 and 3P0 states in KYF4 crystals and powders, Optoelectronics and Advanced Materials - Rapid Communications, 5, 4, April 2011, pp.336-340 (2011).

Submitted at: Feb. 25, 2011

Accepted at: April 11, 2011