Sm³⁺-Doped SrTi(PO₄)₂ Phosphor-in-Glass for Inorganic Colour Conversion in LEDs

Light-emitting diodes (LEDs) have revolutionized the lighting industry due to their energy efficiency, long lifespan, and versatility. However, the performance of commercially available LEDs is often limited by the organic binders used to encapsulate phosphor powders. These binders can degrade over time, leading to reduced luminous efficacy and colour shift. To overcome the drawbacks of organic binders, phosphor-in-glass (PiG) has been considered as a feasible substitute. PiG is fabricated through simple mixing of phosphors with glass frit by sintering at an optimal temperature to form a stable matrix. After the successful incorporation of YAG: Ce<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> into the glass matrix by Y.K. Lee et al.[1], various phosphors were explored for the fabrication of PiG [2]–[4].