Chemical Pressure‐Induced FWHM Narrowing in Narrowband Green Phosphors for Laser Displays with Ultra‐High Saturation Thresholds

Abstract Due to its outstanding performance, laser display technology has received extensive attention. Specifically, in this study, a novel narrow‐band green phosphor, Na _0.6 Rb _0.4 BaB ₉ O ₁₅ (NRBBO): Eu ²⁺ , for laser display is obtained. Under chemical pressure, Eu ²⁺ migrates from Ba ²⁺ to Na ⁺ lattice sites in NRBBO, leading to a gradual decrease in the FWHM, making it more competitive for display applications. The existence of chemical pressure in the lattice is demonstrated through a high‐pressure spectrum. The migration of Eu ²⁺ lattice sites under chemical pressure is verified by XRD refinement, low‐temperature spectrum and EXAFS. NRBBO: 0.11Eu ²⁺ can be effectively excited by NUV and blue light, with an emission peak at 512 nm and a FWHM of 54 nm. It retains 82% of its luminescence intensity at 150 °C compared to room temperature. The luminous flux of NRBBO: 0.11Eu ²⁺ under 90.7 W mm ⁻² laser excitation reaches 2081.6 lm without light saturation. Meanwhile, the excellent CL performance demonstrates that NRBBO: 0.11Eu ²⁺ exhibits stability under high energy density. NRBBO: 0.11 Eu ²⁺ – based WLED achieves a color gamut of 106% NTSC. The excellent performance of NRBBO: 0.11Eu ²⁺ demonstrates great potential as a green phosphor for laser display applications.