Glossary
Optical properties of rare-earth ions

ions de terres rares; rare-earth ions

Ions (generally trivalent) from the lanthanide series (Ce ³⁺ to Yb ³⁺ ) of Mendeleev's table.

crystal field ; champ cristallin

Electrostatic field exerted by the ions surrounding the rare-earth ion in a solid material.

relaxation croisée; cross-relaxation

Energy transfer mechanism between two neighboring ions resulting in the excitation of a lower energy level than the one initially excited.

Addition de Photons par Transfert d'Énergie or APTE ; energy transfer up-conversion

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