Abstract
The tricolor-emitting MgY4Si3O13: Ce3+, Tb3+, Eu3+ phosphors for ultraviolet-LED have been prepared via a high-temperature solid-state method. X-ray diffraction, photoluminescence emission, excitation spectra and fluorescence lifetime were utilized to characterize the structure and the properties of synthesized samples. Two different lattice sites for Ce3+ are occupied from the host structure and the normalized PL and PLE spectra. The emissions of single-doped Ce3+/Tb3+/Eu3+ are located in blue, green and red region, respectively. The energy transfer from Ce3+ to Tb3+ and from Tb3+ to Eu3+ has been validated by spectra and decay curves and the energy transfer mode from Tb3+ to Eu3+ was calculated to be electric dipole-dipole interactions. By adjusting the content of Tb3+ and Eu3+ in MgY4Si3O13: Ce3+, Tb3+, Eu3+, the CIE coordinates can be changed from blue to green and eventually generate white light under UV excitation. All the results indicate that the MgY4Si3O13: Ce3+, Tb3+, Eu3+ phosphors are potential candidates in the application of UV-WLEDs.
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