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Cathodoluminescent efficiency of Y 3 Al 5 O 12 and YAlO 3 single crystals in dependence on Ce 3+ and other dopants concentration
Author(s) -
Autrata R.,
Schauer P.,
Kvapil Jo.,
Kvapil Ji.
Publication year - 1983
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170180711
Subject(s) - ion , analytical chemistry (journal) , activator (genetics) , cathodoluminescence , quenching (fluorescence) , saturation (graph theory) , materials science , dopant , inorganic chemistry , mineralogy , chemistry , doping , fluorescence , luminescence , optics , biochemistry , physics , mathematics , optoelectronics , organic chemistry , chromatography , combinatorics , gene
The content of Ce 3+ ions in the investigated single crystals grown under reducing conditions is limited by a low value of the distribution coefficient. This distribution coefficient decreases sharply with increasing concentration of Ce 3+ ions in a melt. Cathodoluminescent efficiency rises with increasing Ce 3+ concentration up to a certain state of saturation. At higher concentrations of Ce 3+ ions emission from activator centres is dominant, while at lower concentrations defect centres play an important part. Iron acts as a strong quenching centre, especially in the YAlO 3 lattice. Nd, Ir, Fe, Ti, Cr centres exhibit a high quenching effect, too. A trace amount of Mo enhances cathodoluminescent efficiency.