Abstract
A study has been made of the sensitivity to electron radiation damage of the Yb3+ sharp line emission spectrum at 77Kin zinc telluride which had been previously implanted by 50 kV Yb+ ions and given suitable post-implantation annealing treatment. The Yb3+ emission intensity at 1013.6 nm was found to increase with electron damage above a certain threshold energy and, if taken as a monitor of the production of cation displacements, yields a threshold incident electron energy of 145 keV for enhancement ( identical to 5.6 eV zinc displacement threshold energy). Warming the electron-damaged samples to temperatures greater than 160 degrees C allows complete removal of the defects produced by the electron damage. Analysis of the intensity decreases as a function of electron fluence for those Yb3+ emission peaks which are reduced by damage show the rare earth excitation process to be indirect.
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