Luminescence Mechanism in Doubly Doped ${\rm LaF} _{3}$:Er,Nd VUV Scintillator

Doubly doped LaF
₃
:Er, Nd scintillation crystals were grown by modified micropulling-down method. The Er codoping was chosen to enhance the energy transfer from the host lattice to the Nd
³⁺
luminescence center via the 5d-levels of Er
³⁺
, which can be enabled by the overlap of Er
³⁺
5d-4f emission spectrum with the Nd
³⁺
4f-5d absorption. However, no relevant energy transfer was found by photo- and radioluminescence spectra measurements. The reasons of no significant positive effect of Er codoping are discussed.