| Autor: |
P. Benalloul, R. Mach, G. O. Müller, G. U. Reinsperger, J. Benoit |
| Rok vydání: |
1990 |
| Předmět: |
|
| Zdroj: |
Journal of Crystal Growth. 101:989-993 |
| ISSN: |
0022-0248 |
| DOI: |
10.1016/0022-0248(90)91119-b |
| Popis: |
At Mn2+ concentrations in ZnS relevant for electroluminescence applications the decay of emission after pulse excitation is strongly non-exponential. At low excitation an empirical two-parameter formula fits well to it. Luminescence efficiency can be expressed as the time integral over the decay curve (the light sum) divided by the one over loss-free radiative decay, given by the radiative lifetime. The mentioned parametrizing is quite suitable to study the dependence of decay and luminescence efficiency on the Mn concentration [Mn]. This turns out to be not unique: technology of film preparation introduces a factor of 2 variation at optimum doping, and a much larger one at higher [Mn]. However this variation is exceeded by that with brightness itself, due to nonlinear cross relaxation, and with respect to efficiency by the (extra) outcoupling of light, due to scattering. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
