Fig. 1: Collection of “Lenard’s phosphors” sealed in glass tubes (placed in a wooden frame) used for lectures by Prof. B. Gudden – the object is preserved in collections of Charles University in Prague. | npj Heritage Science

Fig. 1: Collection of “Lenard’s phosphors” sealed in glass tubes (placed in a wooden frame) used for lectures by Prof. B. Gudden – the object is preserved in collections of Charles University in Prague.

From: Persistently luminescent materials used by the Germans during World War 2 and related contemporary luminophores

Fig. 1

The labels from left to right: BaCuLi, SrCuLi, SrZnFl, SrBiNa, CaBiNa (in Lenard’s notation the first metal element is that forming sulphide, the second element is a dopant, and the third one represents a fusible additive – e.g., Na2SO4, Li2SO4 or NaF). (Photo: J. Valenta).

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