Improvement of self-activated luminescence properties of Ca2KZn2(VO4)3 down-conversion materials by SSR method based on co-doped Eu3+,Dy3+ rare earth ions concentrations

Abstract

In this study, a self-activated and co-doped Eu, Dy with Ca2KZn2(VO4)3 (CKZVO) phosphors were synthesized by conventional solid state reaction method. The powder X-Ray diffraction study confirm the formation of single phase cubic crystal structure with space group Ia3̅d. The surface morphology of as-synthesized phosphor was verified by SEM analysis. The FTIR spectrum shows characteristic bonds, for bending vibration and asymmetric stretching vibration. In photoluminescence under the UV excitations the CKZVO phosphor display greenish blue emission due to the VO4 transitions ions in host matrix. The PL characteristic of CKZVO: Dy3+ phosphors exhibits intense emission centred at 480 nm (blue) and 573 nm (yellow color). Moreover, CKZVO: Eu3+ phosphor exhibits strong emission at 500 nm (green) and 615 nm (Red) under UV excitation. Further co-doping of Dy3+, Eu3+ in the host matrix reveals a strong emission in blue, green, yellow and red region. The chromaticity coordinates of the samples were in near white region. All the results exhibit that CKZVO: Dy3+, Eu3+ phosphor might be a potential material for NUV-based white light-emitting diodes.