Enhancement of photoluminescence in Eu3+ co-activated Ca2MgSi2O7:Dy3+ phosphors for solid state lighting application

• Dy3+, Eu3+ singly and co-activated Ca2MgSi2O7 phosphors were synthesized via solid state reaction method.
• Photoluminescence properties of prepared phosphors were investigated in detail.
• CIE color coordinate and CCT values were estimated at different single dopant as well as co-dopant concentration.
• Energy transfer between Dy3+ and Eu3+ is observed and investigated.

A series of Ca2MgSi2O7:Dy3+, Ca2MgSi2O7:Eu3+and Ca2MgSi2O7:Dy3+, Eu3+phosphors were synthesized by conventional solid state reaction method. The X-ray diffraction (XRD) patterns were recorded to confirm the phase purity of Ca2MgSi2O7 phosphors. The XRD results showed that the prepared phosphors have single-phase tetragonal structure and incorporation of dopants has no effect on the crystal structure of phosphors. The surface morphological studies were performed using field emission scanning electronic spectroscopy (FESEM). Photoluminescence (PL) properties were systematically investigated in detail. With increasing, Dy3+ concentration the PL intensity first increases, reaches the maximum and then it was decreased. A Similar trend was shown in Ca2MgSi2O7:Eu3+ phosphors. The PL emission intensity was increased at the transitions 5D0 → 7F1 and 5D0 → 7F2 with increasing Eu3+ concentration while decreased the intensity at the transitions 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2. The calculated band gap values of the sample were found to be 4.29, 4.38, 4.11 and 4.23 eV.

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