Sublimation of an OEL Layer

Multilayered organic structures can have unusual optical and physical properties, offering new possibilities for optoelectronic devices, including e.g., organic light emitting diodes (OELDs). In organic multilayers, α-NPD is a hole transporting material. Here, the TGA measurement was carried out under a reduced pressure leading to a decrease in sublimation temperature from approx. 380°C at atmospheric pressure to 240°C under reduced pressure.

α-NPD under atmospheric and reduced pressureα-NPD under atmospheric and reduced pressure