Scanning tunneling spectroscopy and luminescent properties of ZnS:Mn, Cu,Cl thin films

Electrical and luminescent properties of ZnS:Mn,Cu,Cl thin films were investigated. Combined both studies: scanning tunneling microscopy and scanning tunneling spectroscopy were made. The current and differential conductance versus applied voltage were measured for the ZnS:Mn,Cu,Cl thin films. Additionally, the spectral and kinetic properties of the electroluminescent cells based on the ZnS:Mn,Cu,Cl thin films were measured. The maximum of electroluminescence lies at 586 nm. The electroluminescence was excited by regular wave voltage pulses with pulse length from 1 μs to 1 ms. It was shown that time dependence of the electroluminescence is well explained assuming energy transfer between monomolecular centers. (author)