Bifunctional samarium activated red-emitting and thermal resistant phosphor for simultaneous field emission displays and white light-emitting diodes

A series of Sm3+-activated Ca3Gd(AlO)3(BO3)4 red-emitting phosphors were prepared by a traditional hightemperature solid-state approach. They were characterized by XRD refinements, TEM, SEM, EDS, DRS, FTIR, Raman spectra, photoluminescence (PL) spectra, and fluorescence decay curves. The microstructure of the cation-borate phosphors and the presence of Sm3+ dopants, and their impact at the Ca and Gd sites were studied. All the samples exhibited bright red emissions caused by intra-4f transitions of Sm3+ ions when excited at 404 nm. The optimum dopant concentration was 4mol%, and the concentration quenching (CQ) process was driven by dipole-dipole interaction using Inokuti-Hirayama, and Dexter theories. Interestingly, the temperaturedependent PL spectra manifested that the resulting phosphor had excellent thermal stability with an activation energy of 0.234 eV. Ultimately, the investigated phosphor demonstrated excellent chemical stability. The Sm3+-doped CGAB:Sm3+ phosphor can convert NUV LED chips into intense red emission with Commission Internationale de l'Eclairage (CIE) diagrams of 0.615, 0.382 and high color purity of up to 95.6%. The WLED containing CG0.96AB:0.04Sm3+ merged with the commercial phosphors revealed low correlated color temperature (CCTR-.14197 K) and high color rendering index (CRIR-.189.7).

Automated summary

A series of Sm3+-activated Ca3Gd(AlO)3(BO3)4 red-emitting phosphors were prepared and characterized. The optimal doping concentration of 4mol% showed excellent luminescent and thermal stability properties. Ultimately, the investigated phosphor demonstrated excellent chemical stability.