Realization of neutral white light emission in CaMoO4:4Dy3+ phosphor via Sm3+ co-doping

In this paper, Dy3+/Sm3+ co-doped CaMoO4 compounds were synthesized successfully via the auto-combustion method. The tetragonal crystal structure of the phosphors is confirmed by structural study. The vibrational modes are examined by infrared spectroscopy. It has been observed that 4% Dy3+ doped CaMoO4 phosphor shows maximum luminescence intensity. Further, Sm3+ ions are co-doped in 4% De doped CaMoO4 for improving their luminescence properties. The Photoluminescence study illustrates energy transfer between [MoO4](-2) groups and Dy3+/Sm3+ ions, under 296 nm excitation. The Dy3+ doped CaMoO4 phosphors emit two sharp peaks at 484 nm (F-4(9/2)-> H-6(15/2)) and 574 nm (F-4(9/2)-> H-6(13/2)). Further, with Sm3+ co-doping in 4% Dy3+ doped CaMoO4 phosphor, another distinctive emission peak is observed at 647 nm, which is attributed to (4)G(5/2) -> H-6(9/2) electric dipole transition of Sm3+ ion. The Dy3+/Sm3+ co-doped CaMoO4 phosphor gives overall white light emission. For 3% Sm3+ co-doped CaMoO4:4Dy(3+) phosphor, white light is obtained with the CCT value of 4439 K. Hence, the prepared phosphor might be used in white lighting diode applications. (C) 2021 Elsevier B.V. All rights reserved.