Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DF: Fachverband Dielektrische Festkörper

DF 11: Poster

DF 11.27: Poster

Mittwoch, 9. März 2016, 18:00–20:00, Poster E

Low temperature luminescence of current commercial LED-phosphors — •Sergej Bock and Dirk Berben — South Westphalia University of Applied Sciences, Hagen, Germany

In terms of quality improvement of LEDs we present our investigations on low temperature luminescence properties of current commercial LED-phosphors, i.e YAG:Ce. Therefore, spectral and lifetime measurements were made at very low temperatures, from 10 K up to 318 K. The aim is to identify degradation induced shallow defect centers which are frozen out at low temperatures and are being analyzed by means of thermoluminescence spectroscopy. Using Arrhenius plots, the activation energies can be determined and statements about the energy structure of the presented samples can be made. Comparison of different composition and doping levels allow identification of optimization levers.