POSITION OF THE ENERGY LEVELS OF TRIVALENT RARE-EARTH ACTIVATOR IONS RELATIVE TO THE ELECTRONIC ENERGY BANDS OF LANTHANUM OXYSULFIDE: A NEW PICTURE OF EXCITATION AND RELAXATION
- 1 September 1970
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 17 (5) , 184-187
- https://doi.org/10.1063/1.1653357
Abstract
It is shown that most rare‐earth activators in lanthanum oxysulfide show anomalous thermal quenching effects similar to those previously reported for Eu3+. An analysis of the activation energies derivable from regions of unusually rapid thermal quenching indicates, for all ions observed to date, that the quenching processes represent strong interaction between the 4f electron levels of the rare‐earth ions and the conduction band of the host. It thus becomes possible to locate experimentally the positions of the rare‐earth levels relative to the host‐bands. This in turn allows a general explanation of the excitation and relaxation characteristics of the rare‐earth oxysulfide phosphor system.Keywords
This publication has 2 references indexed in Scilit:
- Luminescent Behavior of the Rare Earths in Yttrium Oxide and Related HostsJournal of the Electrochemical Society, 1964
- Electron transfer spectra of lanthanide complexesMolecular Physics, 1962