β-Sialon:Eu 2+ (Si 6-z Al z O z N 8-z :Eu 2+ , 0 < z ≤ 4.2) has been recognized as an excellent narrow-band green phosphor for wide-color-gamut backlights, but it is quite difficult to realize high quantum efficiency when further reducing the bandwidth of β-Sialon:Eu 2+ to achieve high color purity. Herein, we propose an ingenious sintering method to minimize the trade-off between color purity and luminescence intensity of β-Sialon:Eu 2+ , and finally obtain ultra-narrow band β-Sialon:Eu 2+ with an emission maximum of 527 nm, a full width at half maximum of 44.9 nm and an external quantum efficiency of 37.3 % when z is reduced to 0.03. Structural analyses indicate that β-Sialon:Eu 2+ shows higher structural ordering and rigidity with decreasing the Al-O substitution ( i.e. , z value). By combining β-Sialon:Eu 2+ (z = 0.03), a red phosphor K 2 SiF 6 :Mn 4+ with a blue InGaN LED chip, white light-emitting diodes with a luminous efficacy of 93.91 lm W −1 and a color gamut as high as 101.2 % National Television System Committee standard were demonstrated, which are superior to those in color gamut (4.3–16.8 % up) by using commercial β-Sialon:Eu 2+ .
The growing demand for color conversion materials in laser projection displays has positioned phosphor-in-glass films (PiGF) as a promising solution. Single-side sapphire-based anti-reflection (AR) and high-reflection (HR) coatings were fabricated via electron beam evaporation on sapphire substrate backsides, involving alternate deposition of Ta 2 O 5 and SiO 2 thin films with varying thicknesses. These coatings significantly enhanced the optical performance of PiGF, improving its suitability for transmissive PiGF devices. The design enhances blue light in the 440–470 nm range, increasing transmittance from 85.5 % to 93.7 %. Visible light (500–700 nm) generated under blue excitation is reflected toward forward emission, boosting sapphire reflectance from 14.2 % to 94.3 %. As a result, excellent optical performance is achieved. In practical tests, the coated sapphire achieves 2770.6 lm at 12.9 W mm −2 and a luminous efficiency (LE) of 213.7 lm·W −1 , representing the 28.6 % improvement over the uncoated β-Sialon:Eu 2+ (β-Sialon) PiGF. This represents the best optical performance of β-Sialon PiGF to date. Building on this, the composite CaAlSiN 3 :Eu 2+ (CASN:Eu) with a color temperature of 6248 K has been developed, paving the way for the commercialization of PiGF composite materials in laser lighting and display applications.
危险品化学品经营许可证（带存储）