Photo‐ and Cathodoluminescent Properties of Erbium‐Doped Thiogallates

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Abstract
In order to determine the ability of erbium to give a saturated green color, luminescent properties of Er3+ in the thiogallates , and have been investigated. For efficient u.v. or cathodic excitation, the erbium charge transfer band must lie at longer wavelength than the lattice absorption edge; this is the case for the phases. Three processes can contribute to the population of the green emitting levels, , : direct transfer from the charge transfer band, multiphonon transitions, and cross‐relaxations. Multiphonon relaxation probabilities increase in the sequence . The green emission of is strongly saturated (trichromatic coordinates: , , under cathode‐ray excitation).

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