Spectroscopic ellipsometry of the optical functions of tris (8-hydroxyquinoline) aluminum (Alq3)

Abstract Optical functions of tris (8-hydroxyquinoline) aluminum (Alq 3 ) have been studied in the spectral range from 1.55 to 5 eV using spectroscopic ellipsometry. The samples have been deposited by thermal evaporation on glass substrates. Optical functions of Alq 3 deposited on unheated substrates and on substrates kept at 100 °C have been determined. The influence of atmosphere exposure to the optical properties of the Alq 3 films has been investigated by photoluminescence measurements, absorption measurements, and spectroscopic ellipsometry. It has been found that the substrate temperature during evaporation affects the environmental stability of the films.