Photoluminescence properties of CaMgB₂O₅: RE³⁺ (RE = Dy, Eu, Sm) environmental friendly phosphor for solid state lighting

Abstract

This article reports the photoluminescence studies of CaMgB₂O₅: RE³⁺ (RE = Dy, Eu, Sm) phosphors. The reliable, low cost combustion method is used to prepare a series of phosphors for Solid state lighting. In this work, environmental friendly Eu³⁺ doped CaMgB₂O₅ phosphor was first time synthesized by combustion method as the aim of our research is to produce and study the environment friendly phosphors for solid state lighting. The crystal structure of the prepared phosphor was studied by X-ray diffraction method and it almost closely matches with the standard JCPDS file No. 730618 showing the phase purity. The photoluminescence (PL) properties of prepared phosphors were broadly studied by excitation and emission spectra in this work. For the excitation wavelength of 352 nm, the emission spectra of CaMgB₂O₅: Dy³⁺ phosphor showed two peaks observed at 483 nm and 576 nm corresponds to the well known ⁴F_9/2 → ⁶H_15/2 and ⁴F_9/2 → ⁶H_13/2 energy transitions of Dy³⁺ ion respectively. The photoluminescence spectra of CaMgB₂O₅: Eu³⁺ phosphor revealed strong red emission at 614 nm (⁵D₀ → ⁷F₂) at n-UV excitation of 394 nm wavelength. The photoluminescence spectra of the CaMgB₂O₅: Sm³⁺ phosphor exhibit strong orange-red emission at 600 nm wavelength (⁴G_5/2 → ⁶H_9/2) under the UV excitation of 405 nm wavelength. As a result of observed photoluminescence characteristics, the produced phosphors may be a revolutionary material for the solid state lighting applications point of view.