Spectroscopic analysis of Sr6Ca4(PO4)6F2:Dy3+/Eu3+ phosphors for color-tunable LED applications

Abstract

Currently, the development of luminescent materials is a major focus of research. In particular, inorganic phosphor-based compounds have been widely utilized for different types of applications, including in cathode ray tubes (CRTs), lamps, field emission displays (FEDs), radiation dosimetry, and white light-emitting diodes (WLEDs). White light emission was achieved in this study by employing a wet chemical method to successfully synthesize single-host Sr₆Ca₄(PO₄)₆F₂:Dy³⁺/Eu³⁺. The Sr₆Ca₄(PO₄)₆F₂ phase purity was validated by XRD analysis. In photoluminescence (PL) tests, Sr₆Ca₄(PO₄)₆F₂:Dy³⁺ doped phosphors demonstrated effective excitation at 349 nm, exhibiting noticeable emission bands at 487 nm and 576 nm. The color characteristics of the produced luminous samples were calculated using the Commission internationale de l'éclairage (CIE) coordinates. These findings suggest that Sr₆Ca₄(PO₄)₆F₂ phosphors co-doped with Dy³⁺/Eu³⁺ could be suitable for making white LEDs that can be excited by UV-LEDs.