Design of all-inorganic Sr₅(PO₄)₃Cl: Eu²⁺ phosphor-in-glass for next generation violet-chips-excited sunlight-like healthy lighting

To call for green and low-carbon lighting development strategy, sunlight-like health lighting has become the next generation of light-emitting diode (LED) trends. The conventional LEDs are deficient in the violet part and contain high-radiation blue light which is harmful to human eyes. The traditional organic phosphor and chip packaging mode leads to poor heat dissipation. Therefore, it cannot meet the human demand for high-quality, healthy lighting. In this study, a series of violet-excitable blue Sr₅(PO₄)₃Cl: Eu²⁺ (SPOC) phosphor-in-glass (PiG) films were prepared. The PiG film can not only compensate for the violet-yellow gap in the spectral component but also have excellent luminescence performance and reliability. Significantly, the lower co-sintering temperature (335 °C) allows it to maintain 89 % of the initial phosphor quantum efficiency. Relative to the initial state, PiG (E_a = 0.143 eV) at the optimal sintering temperature maintains a 34 % higher resistance to thermal quenching than phosphor-in-silicon (PiS) at 175 °C. This blue PiG-prepared color converter was remotely packaged with a violet chip to achieve a sunlight-like LED with a color rendering index of 96.3 and 100 % color saturation. This research offers great potential for the development of next-generation sunlight-like health lighting. © 2025 Published by Elsevier Ltd.