Sonochemical synthesis & characterization of Dy3+ capped MgSiO3 nanostructures and their photoluminescence studies for display device application

Abstract

A simple bio-template assisted ultrasound synthesis method is followed for the preparation of pure and Dy3+ (1-11 mol %) doped MgSiO3 nanophosphors. Various experimental parameters influences in controlling the shape, size and morphology of the obtained products. The final product is well characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence (PL). It is noticed that the morphology of the product was highly dependent on the surfactant (mimosa pudica) concentration, sonication time, pH and sonication power. The formation mechanism for various micro/nano superstructures is proposed. The characteristic photoluminescence peaks are observed at 484, 574 and 666 nm due to the electronic transitions 4F9/2 → 6Hj (j=15/2, 13/2, 11/2) of Dy3+ ions upon excited at wavelength of 350 nm [6H15/2 → 6 P7/2 (4M15/2)]. The photometric studies indicate that the obtained phosphors may be promising compounds in white light emitting diodes (wLED’s). The present synthesis route is rapid, environmentally benign, cost effective and useful for industrial applications such as solid state lighting and display devices.

Keywords

• Sonochemical synthesis
• Nanophosphor
• Photoluminescence
• bio-surfactant.