Theoretical Approach to Circularly Polarized Emission from Twisted Mesogenic Luminophores

Abstract

The direct release of circularly polarized (CP) light from an emitting layer (EML) enhances the light extraction in typical organic light-emitting diode displays using a circular polarizer. High degree of CP light is generated from a twisted arrangement of mesogenic luminophores induced by adding chiral agents to mesogenic organic light-emitting molecules. Although quite a lot of studies have been carried out to enhance the degree of CP light emitted from this twisted structure, a comprehensive and theoretical analysis for elementary parameters, such as birefringence and twist angles of the mesogenic emitting materials, has not been completely conducted. In this investigation, we derive the degree of CP light with photoluminescence mechanisms by modeling the twisted structure of mesogenic organic light-emitting molecules and by optical calculating based on Stokes parameters and 4 x 4 Mueller matrix. Also, we analyze the simulation results of CP emission with various parameters investigated under various conditions. The results of our study are expected to help understand the emission mechanism of CP light and serve as the basis for analysis to improve the performance of displays using CP light and devices used in related areas.