Abstract
The improvement of solid-state luminescence technology is an important way to cope with the current severe energy consumption. For the efficient utilization of rare earth ions, Bi3+ and Tb3+ activated Ca2LaTaO6 (CLTO) phosphors were designed and prepared using a solid phase reaction technique. The structural properties of the samples have been studied in detail through XRD, EDS and XPS techniques. Combined with UV–vis reflectance spectroscopy, excitation and emission spectra, the photoluminescence characteristics of CLTO phosphors were analyzed in detail. Bi3+ ions can occupy distinct sites in the CLTO host to create two emission centers. The adjustable multicolor emission is realized in the CLTO:Bi3+,Tb3+ compounds depending on the approximately 100% energy transfer from Bi3+ to Tb3+ ions. By exploring the fluorescence spectra, it was demonstrated that the energy transfer process is contributed by the dipole-dipole interaction mechanism. Besides, the CLTO:Bi3+,Tb3+ phosphors have good thermal stability, suggesting it is a potential luminescent material for UV LEDs.
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