Luminescence Amplification of Transition Metals by Divalent Lanthanide Ions

Transition metal ions, especially Mn²⁺ and Mn⁴⁺, have interesting luminescence properties, which justify their importance in different application ranges. However, the emission of the parity forbidden d-d transitions is usually weak. This problem is solved with aid of a strong Ln²⁺ excitation combined with an efficient energy transfer to the transition metal ion. Especially our systems with Eu²⁺, Yb²⁺ and Mn²⁺ ions present very interesting results in this field.

Emission spectra of SrZnCl₄:Eu²⁺,Mn²⁺ (left) and phosphors under the UV light