A novel blue-greenish emitting phosphor Ba3LaK(PO4)3F:Tb3+ with high thermal stability

• The Ba3LaK(PO4)3F:Tb3+ phosphors exhibit a broad excitation band.
• The Ba3LaK(PO4)3F:Tb3+ emission color adjust from blue to green.
• The Ba3LaK(PO4)3F:Tb3+ show superior thermal stability.

Ba3La1−mK(PO4)3F:mTb3+(m = 0.01–0.50) phosphors have been prepared by a traditional high temperature solid-state reaction. XRD analysis verified the apatite-type phase structure of the as-prepared samples, and the morphology has been checked by the Scanning electron microscope (SEM). The emission spectrum of Ba3LaK(PO4)3F:Tb3+ phosphor consists of two regions, blue emission band from 380 to 470 nm and green emission band from 470 to 650 nm. With increasing Tb3+ ions doped concentration (m), the color hue of Ba3La1−mK(PO4)3F:mTb3+adjusts from blue to green. On the basis of concentration quenching method, the critical distance between Tb3+ ions is calculated to be 7.98 Å, suggesting that multipolar interaction predominate in quenching process. In addition, the temperature-dependence PL spectra of Ba3LaK(PO4)3F:0.01Tb3+ and Ba3LaK(PO4)3F:0.40Tb3+ phosphor are given,which exhibit superior thermal stability.

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