Spectroscopic Properties of Dy3+-Doped Phosphors Derived from Agricultural Waste for Solid State Lighting Applications

Abstract

The Dy³⁺-doped di-calcium silicate (Ca₂SiO₄) phosphors have been synthesized from conventional solid state reaction method by utilizing the agricultural waste materials. Agricultural materials as raw chemicals of SiO₂ and CaO from rice husk and egg shell powders are consumed in its place of chemicals which were synthesized from non-renewable raw materials. The luminescence characteristics of prepared phosphors were studied through FLS 980 spectrometer measurements. Excitation spectrum of Dy³⁺-doped di-calcium silicate phosphorsexhibited three intense bands at 351, 366 and 387 nm are observed within the near UV and blue regions. Luminescence spectra of Dy³⁺-doped phosphors exhibits sharp intense characteristic blue and yellow emission peaks due to the transitions of ⁴F_9/2 → ⁶H_15/2 and ⁴F_9/2 → ⁶H_13/2, respectively. Emission appearances of established phosphors such as CIE co-ordinates, CCT, CP, CRI and lifetimes, etc., of Dy³⁺ ion have been measured. All the results have been deliberated with reported values and found to be better than many of the reported phosphors derived from agricultural waste materials. Hence, present prepared phosphors might be useful to develop low-cost solid state lightning devices as well as effective consumption of agricultural and food waste materials.