The luminescence properties of β‐Ca3(PO4)2:Tl+, β‐Ca3(PO4)2:Bi3+, and α‐Sr3(PO4)2:Sn2+ are reinvestigated. The emission spectrum of β‐Ca3(PO4)2:Tl+ consists of two bands which can be ascribed to a Jahn‐Teller effect in the excited state of the Tl+ ion. The emission spectrum of Bi3+‐activated β‐Ca3(PO4)2 shows vibrational structure. The 3P0 emission of the Sn2+ ion in α‐Sr3(PO4)2 can only be observed at very low temperatures. The trap depth amounts to 23 cm−1.
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