OLED Structure Optimization for Pure and Efficient NIR Electroluminescence of Nd 3+ Complexes Bearing Fluorinated 1,3-Diketones.

NIR emitting OLEDs (organic light-emitting diodes) with high photoluminescence quantum yields were developed on the basis of fluorinated 1,3-diketonate coordination compounds of the Nd 3+ ion. Both thermal evaporation and spin-coating techniques were successfully employed for active layer deposition resulting in electroluminescence quantum yields up to 1.38·10 -2 %. Blueish-green emission from exciplex and electroplax formations was almost suppressed with the topology optimization of the cell.