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

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 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 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 (4G5/2→6H9/2) 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.