Investigations of Different Phases Responsible for Changes in Optical Properties of Organic Semiconducting Device Material Thin Films

الملخص EN

The environment sensitivity of organic semiconductors may change their molecular structure and hence optical properties.

Exploiting this concept, experiments were performed on a green light emitting material bis(8-hydroxy quinoline)Zinc, (Znq2) used in organic light emitting diodes (OLEDs).

Thin films were deposited at varying deposition parameters, and their properties were compared.

We investigated that as deposited films have a significant component of Znq2 tetramer out of two known forms, that is, dihydrate and anhydrous tetramer (Znq2)4, the films deposited at lower deposition rates have higher anhydrous content.

The degradation of thin film is shown, that changes the optical properties of film from green emission to blue which may be due to water adsorption and crystallization.