On the Luminescence of Some s²‐Ion‐Activated Alkaline‐Earth Phosphates

Abstract

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.

The Structure and Luminescent Properties of TlZn(PO3)3

“…In the studied materials, the Tl> ions are introduced as an impurity, e.g., in alkali halides (4) and in alkali}earth phosphates (5). The intense ultraviolet emission ofCa (PO ) :Tl> was used in #uorescent lamps.…”