Energy Transfer in Y3Al5O12:Ce3+, Pr3+ and CaMoO4:Sm3+, Eu3+ Phosphors

Document Type

Article

Publication Date

3-2011

Publication Title

Journal of Luminescence

DOI

10.1016/j.jlumin.2010.09.011

Abstract

Non-radiative energy transfers (ET) from Ce3+ to Pr3+ in Y3Al5O12:Ce3+, Pr3+ and from Sm3+ to Eu3+ in CaMoO4:Sm3+, Eu3+ are studied based on photoluminescence spectroscopy and fluorescence decay patterns. The result indicates an electric dipole–dipole interaction that governs ET in the LED phosphors. For Ce3+ concentration of 0.01 in YAG:Ce3+, Pr3+, the rate constant and critical distance are evaluated to be 4.5×10−36 cm6 s−1 and 0.81 nm, respectively. An increase in the red emission line of Pr3+ relative to the yellow emission band of Ce3+, on increasing Ce3+ concentration is observed. This behavior is attributed to the increase of spectral overlap integrals between Ce3+ emission and Pr3+ excitation due to the fact that the yellow band shifts to the red spectral side with increasing Ce3+ concentration. In CaMoO4:Sm3+, Eu3+, Sm3+–Eu3+ transfer occurs from 4G5/2 of Sm3+ to 5D0 of Eu3+. The rate constant of 8.5×10−40 cm6 s−1 and the critical transfer distance of 0.89 nm are evaluated.

Copyright

Copyright belongs to Elsevier. Information regarding the dissemination and usage of journal articles can be accessed through the following links.Â

Link to Full Text

Share

COinS