Electroluminescence from ZnS:MnCl2 thin film devices co-doped with MgF2 or Mgs

摘要

We report a red shift in the light emission from thin film electroluminescent devices consisting of ZnS co-doped with MgF2 and MnCl2 as the phosphor semiconductors and Ta2O5 films as insulators. The elec- troluminescence spectrum shows two peaks at ~615 nm and at ~670 nm. The devices have a threshold of about l10 V under 50 Hz a.c driving voltage and show bright- ness over ~100 cd/m2 at l60 V. The devices are com- pared with MgS co-doped devices which show green shifted light emission.