Yellow persistent luminescence in Ce³⁺–Cr³⁺-codoped gadolinium aluminum gallium garnet transparent ceramics after blue-light excitation

We have developed a yellow persistent phosphor of Ce 3+ –Cr 3+ -codoped Gd 3 Al 2 Ga 3 O 12 transparent ceramics prepared by a solid-state reaction. The yellow persistent luminescence due to the Ce 3+ : 5d–4f transition was observed even after 460 nm blue-light excitation as well as after UV excitation. The chromaticity coordinate of the persistent luminescence in the ceramic phosphor is located at , which appears really yellow compared with the color coordinate of the well-known SrAl 2 O 4 :Eu 2+ –Dy 3+ or other conventional blue or green persistent phosphors. The luminance values for the transparent ceramic sample 1, 5, and 30 min after the blue excitation was ceased are 731, 63, and 8 mcd/m 2 , respectively.