Mechanism of blue-shift of Mn2+ luminescence in ZnMgS : Mn for electroluminescent thin films

Citation
K. Ichino et al., Mechanism of blue-shift of Mn2+ luminescence in ZnMgS : Mn for electroluminescent thin films, JPN J A P 1, 40(3A), 2001, pp. 1289-1293
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
40
Issue
3A
Year of publication
2001
Pages
1289 - 1293
Database
ISI
SICI code
0021-4922(200103)40:3A<1289:MOBOML>2.0.ZU;2-3
Abstract
The mechanism of the blue-shift of Mn2+ luminescence in ZnMgS:Mn is studied . Single crystal zincblende Zn1-xMgxS:Mn thin films (x less than or equal t o 0.50) were, grown by molecular beam epitaxy on GaAs substrates. The photo luminescence (PL) spectrum of Zn0.50Mg0.5S:Mn peaks at 572 nm, which is 12 nm shorter than the PL peak wavelength of ZnS:Mn. The PL excitation spectru m of Zn1-xMgxS:Mn has five excitation bands due to the energy levels of Mn 3d(5) electron configuration. These excitation bands shift to shorter wavel engths with increasing Mg content. The cause of these shifts seems to be a weakening of the crystal field due to an increase in the distance between M n and S. The ratio of the shift in emission energy to the relative change i n lattice constant, DeltaE/(Deltaa/a), is found to be 2.3 eV (23 meV/%). Th is value is approximately half the value of the Mn emission in ZnS:Mn under high pressure.