Insights into the preparation and photoluminescence properties of MgTi2 O5 : Eu3+ red phosphor with high color purity for w-LED applications

As one of the critical components for achieving high-quality white light emitting diodes (w-LEDs) are efficient phosphors, a series of intense red emitting Eu 3 + doped magnesium dititanate (Mg (1- x ) Ti 2 O 5 : x Eu 3 + ; x = 0, 0.005, 0.008, 0.01, 0.02 and 0.03 mol) phosphors were prepared via solid-state reaction method. The X-ray diffraction (XRD) patterns confirmed the phase purity and orthorhombic structure of the prepared phosphors. The Ti -O functional groups were detected from the Fourier transform infrared (FTIR) spectra and Field emission scanning electron microscopy (FESEM) images revealed agglomerated spherical-like shaped phosphor particles. Under 465 nm excitation, intense red emission corresponding to 5 D 0 -> 7 F J ( J = 0, 1, 2, 3, and 4) transitions of Eu 3 + ions were recorded in the photoluminescence (PL) spectra with an intense peak at 615 nm. The optimum concentration of Eu 3 + ions was determined to be 1 mol% and the concentration quenching mechanism was due to the interaction between adjacent Eu 3 + ions. The lifetime values of the samples were in the millisecond range and the internal quantum efficiency was determined to be 31.65 %. The Commission Internationale de l 'Eclairage (CIE) coordinates of the optimum sample Mg 0.99 Ti 2 O 5 :0.01Eu 3 + are (0.6421, 0.3575), lies in the red region with 99.9 % color purity and have warm correlated color temperature (CCT) values. Therefore obtained results suggest that the prepared Mg (1- x ) Ti 2 O 5 : x Eu 3 + phosphors can be used as an efficient red phosphor for wLED applications.