Abstract
Undoped, Dy3+ doped and Dy3+, Eu3+ co-doped Ca2ZnSi2O7 (CZS) phosphors were successively prepared using the solid state reaction method. The XRD and FE-SEM results revealed that the prepared phosphors have tetragonal crystal structure and agglomeration of particles. The energy band gaps of doped and co-doped phosphors were found to be increased as compared to undoped CZS. From the PL spectra, it was found that the energy transfer from sensitizer (Dy3+) to activator (Eu3+) ion in co-doped CZS: Dy3+, Eu3+ phosphors were mainly due to quadrupole-quadrupole interaction. The prepared CZS: Dy3+, Eu3+ phosphor the emission intensity retained almost 80% at 425K of that measured at 300K. The emission color had tuned with the incorporated of Eu3+ ion in CZS: Dy3+ phosphor. The quantum efficiency of CZS: Dy3+, Eu3+ phosphor is 12.88%. All the results of CZS: Dy3+, Eu3+ phosphors showed a great potential application as a white-emitting phosphor for solid state lighting application.
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