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

• Published in: Journal of molecular structure Vol. 1264; p. 133250
• Main Authors: Mehare, C.M., Mishra, Girish, Dhoble, N.S., Dhoble, S.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-09-2022
• Subjects: Energy transfer; Luminescence; Rare earth ions; self-activating vanadate based phosphor; WLEDs; WLEDs; Rare earth ions; Energy transfer; self-activating vanadate based phosphor; Luminescence
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2022.133250

•A novel self-activated Ca2KZn2(VO4)3:Eu3+, Dy3+ crystalline phosphor were synthesized via solid state reaction.•All the samples can be excited by NUV light and the optimal doping content was 1.5 mol%.•Eu3+ and Dy3+ as co-dopants almost insignificantly improve luminescence properties.•This host can be efficiently excited by ultraviolet light, and exhibits a strong green emission band.•The PL emission of synthesized material extends from the Red, green, blue region suggesting that this material could be employed in UV-LEDs and generally, vanadate compounds have a wide range of applications in the fields of catalysis, electrochemistry and optical lasers.
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.
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