Non-concentration quenching and good thermal stability in Sr₃NaY(PO₄)₃F:Eu³⁺ Phosphors

Various red phosphors are usually designed to supplement the red component of traditional YAG: Ce³⁺ phosphor to realize the high-quality WLED. However, the majority of the materials are suffered from the serious concentration quenching and temperature quenching of the activators. In the present work, non-concentration quenching Sr₃NaY(PO₄)₃F: Eu³⁺ (SNYPF: Eu³⁺) phosphors were prepared by high-temperature solid-state reaction. The emission intensities of the samples increase continuously with the increase of Eu³⁺ doped concentration from 0.01 mol to 1 mol. The non-concentration quenching behavior can be explained by calculating the value of the critical distance between Eu³⁺- Eu³⁺ ions in SNEuPF. The average lifetimes of the ⁵D₀ energy level of SNYPF: Eu³⁺ are obtained at different Eu³⁺ concentration, which are determined to be ~ 2.3 ms and scarcely varies with concentrations. Furthermore, the SNYPF: Eu³⁺ phosphors exhibit good temperature characteristics. At the general working temperature of WLEDs (400 K), the emission intensity of SNEuPF remains 80.3% of the initial intensity. The results suggest that the SNEuPF phosphor can be regarded as a potential red component to realize high-quality wLEDs.