Synthesis of Zn2SiO4:Mn2+ and Zn2SiO4:Ti4+ Nanocrystal as Photoluminescence Material by means of Sonochemical Methods

• Main Author: SISKA AYU PRASTITI (NIM: 10512089)
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30974
• Institution: Institut Teknologi Bandung

<p align="justify">For the first time, nanocrystalline manganese - doped zinc orthosilicate (Zn2SiO4:Mn2+) and titanium - doped zinc orthosilicate (Zn2SiO4:Ti4+) were prepared using a simple sonochemical method. Zn(NO3)2, TEOS, Mn(NO3)2, and Ti[OCH(CH3)2]4 were used as starting materials to synthesize Zn2SiO4:Mn2+ and Zn2SiO4:Ti4+ compounds. According to X - ray diffraction (XRD) result, Zn2SiO4:Mn2+ and Zn2SiO4:Ti4+ compounds started to crystallize into willemite &#945; - Zn2SiO4 structure after calcinated at 900oC. Photoluminescence (PL) spectra from both samples showed that intensity was increasing with temperature and time of calcination, from 900oC - 1000oC. A green emission peak centered at 525 nm (2.36 eV) as the result of Zn2SiO4:Mn2+ photoluminescence. Whereas for Zn2SiO4:Ti4+ powder exhibited two peaks, at 366 nm (3.39 eV) and 522 nm (2.38 eV). Diffuse reflectance spectroscopy results indicate the band gap energy for Zn2SiO4:Mn2+ and Zn2SiO4:Ti4+ compounds were around 2.34 eV and 3.04 eV, respectively. It is showed that the addition of dopant will lead to the decreasing of Zn2SiO4 band gap.<p align="justify">