Abstract
Organic light emitting diodes (OLEDs) based on zinc complexes with tetradentate Schiff bases — ZnSB [H2SB =H2Sal1, H2Sal2 (derivatives of salicylic aldehyde); H2MO1, H2MO2 (derivatives of o-vanillin)] display reversible and irreversible electroluminescence (EL) instability. The reversible instability occurs after switching voltage on and the irreversible instability produced by UV light irradiation, heating, and aging under the ambient conditions. In view of the results obtained, the first type of instability is associated with the trap filling processes and the second type appearing at heating is possibly attributed to the changes in the interface domains. Recommendations for the evaporation and capsulation conditions are provided.
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