Red-emitting Eu3+-doped NaInGe2O6 phosphor for WLEDs: Crystal structure, luminescence properties and thermal stability

This article systematically investigates the preparation, structure, and luminescent properties of a novel Eu 3+ -based germanate phosphor: NaInGe 2 O 6 (NIGO): Eu 3+ . NIGO: Eu 3+ exhibits strong absorption in the near ultraviolet (NUV) and blue region, which enables it to be effectively excited by the blue LED chip. Under 465 nm excitation, NIGO: Eu 3+ exhibits a red emission peak at 610 nm, reaching 82.60 % and 68.6 % of the emission intensity of Y 3 Al 5 O 12 (YAG): Ce 3+ and K 2 TiF 6 :Mn 4+ . NIGO: Eu 3+ also has good thermal stability, retaining 76.23 % even at 150 °C. Furthermore, combining NIGO: Eu 3+ with commercial YAG: Ce 3+ phosphors significantly enhances the luminescent performance of blue-chip-excited white light-emitting diodes (WLEDs), including improvements in color rendering index (CRI) and correlated color temperature (CCT). This work indicates that NIGO: Eu 3+ phosphors possess promising potential for WLED applications.