Photoluminescence properties of Al3GdB4O12:Eu phosphors
نویسنده
چکیده
An investigation is reported of the photoluminescence (PL) properties of Al3GdB4O12:Eu phosphors. Under vacuum ultraviolet excitation, Al3GdB4O12:Eu exhibited a bright red luminescence with CIE chromaticity coordinates of (0.643, 0.356) with a PL intensity of 60% of the sodium salicylate standard. The PL spectrum showed a ground state splitting pattern consistent with D3 symmetry. The PL excitation spectrum showed sharp lines due to the S7/2– IJ and PJ transitions of Gd 3+ in addition to the f–f transitions of Eu. The charge transfer band of Eu was observed at 250 nm and the host absorption band was detected at 157 nm. Time-resolved spectroscopy was performed to investigate the interaction between Gd and Eu ions. The energy transfer rate from Gd to Eu ions was found to be 17 000 s. © 2000 Elsevier Science S.A. All rights reserved.
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