Pressure dependence of phase transition of organic material, 9,10-di(2-naphthyl)anthracene (ADN), under vacuum

摘要

The phase transition characteristics of 9,10-di(2-naphthyl)anthracene (ADN) used for an organic light emitting diode (OLED) are evaluated under vacuum. The phase transition shows a plateau in the temperature curve of the ADN material when it is heated to its melting or sublimation temperature under pressure in a vacuum chamber. At 1 atmospheric pressure, the ADN has a melting temperature that can be verified by differential scanning calorimetry (DSC). As the vacuum chamber is evacuated from 1 atmospheric pressure, the melting temperature decreases by a few degrees, and it sublimates below 1 Torn The sublimation temperature decreases slightly as the pressure is lowered as well. This result provides not only the optimal evaporation condition of ADN but also information about the thermal stability of ADN and other types of organic materials for OLEDs under a high vacuum.