Simultaneous emission of orthogonal handedness in circular polarization from a single luminophore

Abstract

The direct emission of circularly polarized (CP) light improves the efficiency of an organic light-emitting diode and characterizes the secondary structure of proteins. In most cases, CP light is generated from a luminescent layer containing chiral characteristics, thereby generating only one kind of CP light in an entire device. Here, we propose direct CP light emissions using a twisted achiral conjugate polymer without any chiral dopant as an emitting layer (EML). The twisted structure is induced in the mesogenic conjugate polymer due to its elasticity by applying different alignment directions to its upper and lower interfaces. Furthermore, we demonstrate the simultaneous emission of orthogonal CP light in a single luminescent device by patterning different alignment directions on the surfaces of the EML. The light source with multipolarization including the orthogonal CP states is applicable to many applications in biosensors and optical devices.

A Unified Model to Explain the Large Chiroptical Effects in Polymer Systems Through Natural Optical Activity

“…In an effort to rationalise this observation with previously reported results, we introduced anisotropic alignment layers of rubbed polyimide (PI) before spin-coating the polymer thin films. 17,44,45 Rubbed PI layers have been shown to promote the unidirectional alignment of liquid-crystalline materials. 44,46 In contrast to their non-aligned counterparts, the MMSE of polymer thin films with alignment layers have linear and circular terms in both reflection and transmission ( Figure S9), which cannot be isolated upon sample rotation.…”

“…17,44,45 Rubbed PI layers have been shown to promote the unidirectional alignment of liquid-crystalline materials. 44,46 In contrast to their non-aligned counterparts, the MMSE of polymer thin films with alignment layers have linear and circular terms in both reflection and transmission ( Figure S9), which cannot be isolated upon sample rotation. For the aligned CSCP films we first attempted to fit these data using an optical model with natural optical activity but found that it could not accurately reproduce both linear and circular terms simultaneously (Figure 4, Figure S10).…”

Chiral Absorbers Based on Polarization Conversion and Excitation of Magnetic Polaritons

“…[30] The simulation is based on the rigorous coupled-wave analysis (RCWA). [33][34][35] The conventional RCWA algorithm is focused on incidence of linearly polarized waves, rather than circularly polarized waves. For an aid of easy understanding of the numerical method, a detailed description of the RCWA is presented in the Appendix for incidence of an arbitrarily polarized wave.…”

“…Using RCWA to calculate the reflection and transmission of the grating structures has been discussed by several groups. [33][34][35] Here we would like to give a detailed description about this process for arbitrarily polarized wave in this paper.…”

“…The inverse of the dielectric function is used for the sake of fast and guaranteed convergence according to the Fourier factorization rule. [35] and are diagonal matrices with the diagonal elements and , respectively. is the identity matrix and is the zero matrix.…”