Polarized Light Emission from Uniaxially Oriented and Polymer-Stabilized AIE Luminogen Thin Films

Abstract

Organic materials with linearly polarized luminescence (LPL) properties and good processability are critical to the development of advanced optical devices. To fabricate polymer-stabilized thin films with LPL properties, dicyanodistyrylbenzene-based reactive luminogens (abbreviated as DRL) containing both vinyl and thiol units were newly synthesized. On the basis of morphological observations combined with thermal and scattering analyses, it was found that DRL has a nematic liquid crystal mesophase. DRL molecules were uniaxially oriented by surface alignment layer and stabilized by thiol–ene click reaction. Uniaxially oriented and polymer-stabilized DRL thin films showed excellent chemical resistance as well as mechanical and thermal stability due to the chemically cross-linked polymer network. The DRL polymer film exhibited strong emission at 564 nm with remarkable LPL property. The polymer-stabilized films obtained from reactive luminogens with aggregation-induced enhanced emission (AIEE) properties have great potential for the application of advanced optical devices.

Polarized Fluorescence of N-Salicylideneaniline Derivatives Formed by In Situ Exchange from N-Benzylideneaniline Side Groups in Photoaligned Liquid Crystalline Copolymer Films

“…Polarized fluorescence is crucial to fabricate polarized light-emitting and polarization-sensing devices. − However, directly aligning fluorescent moieties is difficult. Polarized fluorescent light emissions using photoalignment techniques employ a photoalignable layer without fluorescent materials because such materials typically absorb the light used in the photoalignment process. , …”

Cyclometalated Pt(II)‐Terpyridine Metallomesogen: What Is Visible or Invisible That Is a Matter of Molecular Packing and Orientation

“…Over the last several decades, there has been an upsurge in demand for new luminescence‐switching materials that can be applied to highly efficient and sustainable optoelectronics, displays, optical sensors, and anticounterfeiting technologies. [ 1–8 ] Although luminescent materials have been widely studied, research is typically focused on improving the quantum efficiency. [ 4 ] However, a deep understanding of solid‐state luminescence is limited without considering both the chemical structure and the self‐assembled supramolecular structure of the luminescent materials.…”

“…[ 1–8 ] Although luminescent materials have been widely studied, research is typically focused on improving the quantum efficiency. [ 4 ] However, a deep understanding of solid‐state luminescence is limited without considering both the chemical structure and the self‐assembled supramolecular structure of the luminescent materials. [ 9 ] For this reason, maximizing the efficiency and performance of solid‐state light‐emission by precisely controlling the self‐assembled hierarchical structure of luminous molecules is essential for the advancement of advanced luminescent material technology.…”

Circularly and Linearly Polarized Luminescence from AIE Luminogens Induced by Super‐Aligned Assemblies of Sub‐1 nm Nanowires

“…On the other hand, isotropic luminescence results in at least 50 % emission loss when light passes through a polarizer, and LPL can reduce the loss effectively. [12] The traditional methods for fabrication of LPL materials, such as Langmuir-Blodgett deposition and electric-field-driven assembly, usually require relatively complex processing. [13] SNWs exhibit different assembly behaviors under different conditions.…”