Structural, optical, and dielectric properties of Co2+: Zn2SiO4 glass-ceramics for blue phosphor used in optoelectronic devices

For the first time, the author reported the fabrication and characterizations of Co2+ doped Zn2SiO4(Co2+: Zn2SiO4) using the recycled waste white rice husk ash (WRHA) based on empirical formula (Co3O4)(1.0)[(ZnO)(55.0) (WRHA)(45).(0)](99).(0) and produced by using melt-quenching technique. The precursor glass was heat treated at 700 degrees C until 950 degrees C. The X-ray diffraction (XRD) result of Co2+: Zn2SiO4 showed that beta-Zn2SiO4 started to form at 750 degrees C and single phase of alpha-Zn2SiO4 remain stable at 950 degrees C. The Fourier transform infrared spectroscopy (FTIR) confirmed the formation of Co2+: Zn2SiO4 by showing eight significant vibrational bands. One triplet absorption band occurred at around 450-700 nm attributed to (4)A(2) -> (4) T-1 (P-4) optical transition of Co2+ ions that gives blue color towards the Co2+: Zn2SiO4 sample. Emission spectroscopy of Co2+: Zn2SiO4 exhibit five different peaks corresponded to blue emission (similar to 416 nm, similar to 441 nm, similar to 461 nm and similar to 481 nm) and green emission (similar to 527 nm) under excitation at 325 nm. Such luminescence properties making Co2+: Zn2SiO4 as a potential phosphor material especially in providing blue emission supported by the excellent dielectric properties. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

The fabrication and characterizations of Co2+ doped Zn2SiO4 using recycled waste white rice husk ash were reported for the first time. The Co2+ doped Zn2SiO4 exhibited blue and green emission properties, making it a potential material for various applications.