Highly efficient low-voltage cathodoluminescence of LaF_3:Ln~(3+) (Ln=Eu~(3+),Ce~(3+),Tb~(3+)) spherical particles

摘要

Spherical particles of rare-earth doped LaF_3 are synthesized through refluxing in glycerol/water media. The low-voltage cathodoluminescence of LaF_3:Eu due to ~5D_0→~7F, and~5 D_0→ ~7F_2 transitions was found to be sensitive to the site that Eu~(3+) ions occupied. The luminous efficiency of LaF_3:Ce~(3+), Tb~(3+) with green emission is improved from 1.53 to 2.02 lm/W compared with LaF_3: Tb~(3+), due to the energy transfer processes from Ce~(3+) to Tb~(3+) ions. Our results suggest that the obtained spherical particles of rare-earth doped LaF_3 are promising as highly efficient low-voltage cathodoluminescent phosphors, which have received considerably less attention.