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

Siti Aisyah, Abdul Wahab and Khamirul Amin, Matori and Sidek, Hj Abd Aziz and Mohd Hafiz, Mohd Zaid and Mohd Mustafa, Awang Kechik and Idza Riati, Ibrahim and Mohammad Zulhasif, Ahmad Khiri and Nuraidayani, Effendy and Muhammad Najibudin, Abu Bakar (2022) Structural, optical, and dielectric properties of Co2+: Zn2SiO4 glass-ceramics for blue phosphor used in optoelectronic devices. Journal of Alloys and Compounds. ISSN 0925-8388

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Abstract

For the first time, the author reported the fabrication and characterizations of Co2+ doped Zn2SiO4 (Zn2SiO4: Co2+) 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 ℃ until 950 ℃. The X-ray diffraction (XRD) result of Zn2SiO4: Co2+ showed that β- Zn2SiO4 started to form at 750 ℃ and single phase of α-Zn2SiO4 remain stable at 950 ℃. The Fourier transform infrared spectroscopy (FTIR) confirmed the formation of Zn2SiO4: Co2+ by showing eight significant vibrational bands. One triplet absorption band occurred at around 450 - 700 nm attributed to 4A2 → 4T1 (4P) optical transition of Co2+ ions that gives blue colour towards the Zn2SiO4: Co2+ sample. Emission spectroscopy of Zn2SiO4: Co2+ exhibit five different peaks corresponded to blue emission (~416nm, ~441 nm, ~461 nm and ~481 nm) and green emission (~527 nm) under excitation at 325 nm. Such luminescence properties making Zn2SiO4: Co2+ as a potential phosphor material especially in providing blue emission supported by the excellent dielectric properties.

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