Abstract
Cathodoluminescence of Sm3+, Eu3+, and Yb3+ in is known to be enhanced by a trace of Tb3+ or Pr3+. Nd3+, Gd3+, Dy3+, Ho3+, Er3+, and Tm3+show similar enhancement of efficiencies by addition of Tb3+ or Pr3+. For an electron beam with a current density of about 10−4 A/cm2, in a raster of about 1 cm2 area, the efficiency of is found to be greater by a factor of 1.5–7, depending on the RE3+, than the efficiency of the corresponding Tb3+ ‐free material. The efficiency of singly activated with a rare earth depends sublinearly on the current density as a consequence of an unidentified superlinear quenching mechanism. When Tb3+ or Pr3+ is codoped, the quenching process is made ineffective, and a linear dependence on the current density is obtained. This effect of Tb3+ or Pr3+ is related to their large cross sections for holes as revealed by high efficiencies at low concentrations and also by a systematic study of thermoluminescence glow curves.
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