Two-site occupancy induced a broadband blue-emitting in Eu2+ doped Na3Ba2Ca(PO4)3 phosphor

During the process of developing commercial chips, the phosphors with single broadband emission are indispensable. In this report, a new ternary phosphate phosphor Na3Ba2Ca(PO4)(3):Eu2+ has been successfully synthesized by the high-temperature solid-state reaction (HSSR) method, which shows broad emitting band in the range of 350-600 nm centered at 436 nm (FWHM similar to 72.3 nm). The crystal structure of the Na3Ba2Ca(PO4)(3) and Eu2+ doped Na3Ba2Ca(PO4)(3) were determined by the Rietveld method, indicating the trigonal system with P31c space group. The selective two-site occupancy tendency of Eu2+ ions at Ba1O(9) and Ca2O(8) sites in the matrix was comprehensively revealed according to the split peaks (433 nm and 469 nm) at 298 K and 11 K, computational validation and fluorescence lifetime analysis of photoluminescence spectrum. Impressively, the optimal Na3Ba2Ca(PO4)(3):0.02Eu(2+) phosphor exhibits appropriate spectrum resemblance (SR) indexes (58.5% and 72.2%), proper thermostability (78.6%) and excellent chromaticity stability (Delta x = 8.68 x 10(-6) and Delta y = 3.64 x 10(-5)). Besides, the phosphor prepared by HSSR owns the higher internal quantum efficiency of 62.1% in comparison with that synthesized by polymerizable complex (PC) method. The new phosphor can serve as a potential broadband and blue-emitting phosphor for the application of solid-state lighting and plant growth.

Automated summary

A new phosphor with broadband and blue emission has been successfully synthesized in this report, which exhibits appropriate spectral resemblance, thermal stability, and chromaticity stability, as well as higher internal quantum efficiency. This phosphor has the potential for applications in solid-state lighting and plant growth.