Color-Tunable Persistent Luminescence of CaM(PO):Eu (M = Li, Na, and K) with a β-Ca(PO)-Type Structure.

Eu-activated CaM(PO) (M = Li, Na, and K) phosphates have been explored extensively because of their tunable emission wavelengths and excellent luminescence performances. Herein, the persistent luminescence (PersL) properties of Eu-doped CaM(PO) phosphors with a β-Ca(PO)-type structure are reported. With the variation of alkali metal M from Li to Na and to K, the PersL color can be adjusted sequentially from yellow to white and to blue, and the persistent durations are prolonged significantly from about ∼61 s for CaLi(PO):0.003Eu to ∼1950 s for CaNa(PO):0.001Eu and to ∼7440 s for CaK(PO):0.0005Eu at the threshold value (0.32 mcd/m) after 254 nm irradiation. The trap depths are estimated according to the thermoluminescence glow curves with various heating rates. Comparing the thermoluminescence excitation and photoluminescence excitation spectra, it can be verified that there are two sources of ionized electrons in the charging process: one is excited from the valence band to the conduction band (CB) and the other is excited from the 4f ground state of Eu to the higher 5d levels or directly to the CB. Finally, the PersL mechanism is proposed. This work is expected to motivate more research of Eu-doped phosphate-based PersL materials, as well as contributes to the understanding of the PersL mechanism of Eu-doped phosphors.