Phosphor in glass using β-SiAlON:Eu2+, CaAlSiN3:Eu2+ and Nd-doped silicate glass for enhanced color gamut of white LED

Highlights:• A white LED was realized with a PiG using β-SiAlON:Eu²⁺ and CASN:Eu²⁺.• The color gamut has been enhanced up to 88% by introducing Nd-doped silicate glass.• The PiG showed high thermal stability and its practical feasibility. -- Abstract: A phosphor-in-glass (PiG) was fabricated to realize a robust white light emitting diode (wLED) with wide color gamut. β-SiAlON:Eu²⁺ and CaAlSiN₃:Eu²⁺ were employed for the green and red phosphors, respectively. Nd₂O₃ doped silicate glass was used to reduce the emission bandwidths of the phosphors, utilizing the hypersensitive transition of Nd³⁺: ⁴I_9/2 → ⁴G_5/2, ²G_7/2. The content of green and red phosphors was varied to produce a white emission. The emission spectra, color coordinates and color gamuts of the wLEDs with the PiGs were examined by varying phosphors and Nd₂O₃ content. A wLED with 5 mol% Nd₂O₃ doped glass had an enhanced color gamut up to 88%. The thermal stability of the PiGs was also monitored to demonstrate its practical feasibility as a white light source in display applications.