Polarized organic electroluminescence: Ordering from the top

Abstract

Effective ionic charge polarization using typical supporting electrolyte and charge injection phenomena in molecularly doped polymer light-emitting diodes

Synthesis and Characterization of Light-Emitting H-Bonded Complexes and Polymers Containing Bis(pyridyl) Emitting Acceptors

“…A number of reports demonstrate polarized electroluminescence (EL) with the aim of incorporating such polymer LEDs as backlights into liquid crystal displays. 18 For instance, cyanobiphenyl liquid crystals can be aligned by rubbing polyimide and thus to have dichroic ratios in absorption spectra. 19 The frequently used materials are polyacrylate, 20,21 polyfluorene, 18,[22][23][24][25][26][27][28] and their oligomer derivatives.…”

“…18 For instance, cyanobiphenyl liquid crystals can be aligned by rubbing polyimide and thus to have dichroic ratios in absorption spectra. 19 The frequently used materials are polyacrylate, 20,21 polyfluorene, 18,[22][23][24][25][26][27][28] and their oligomer derivatives. 29 Additionally, lyotropic liquid crystals, which possess a hexagonal mesophase to solubilize the monomer and direct its electropolymerization, are utilized to prepare poly-(3,4-ethylenedioxythiophene) (PEDOT) films that replicate the texture and birefringence of the LC template.…”

Nanopatterning of polyfluorene derivative using electron-beam lithography

“…However, in recent years, the patterning of conjugated polymers itself has emerged as a new class of research topics, 15,16 in which the polymers are regarded as functional materials, such as light emitter. Reproducible micro-or nanopatterning of conjugated polymers is now of importance for applications, such as a microlaser, 4,7,9,11 photonic crystal, 17 nanoscale OLEDs, 18 quantum dots, 19 etc. The downsizing of the patterned conjugated polymers has advantages, such as improvement of light trapping in polymer photodiode, 20 increase in efficiency, and control of polarity and spectrum of emission from microstructured OLEDs.…”

ACR announcements

“…The emission color of PFs also can be tuned to be green, yellow, red, and so forth by incorporating narrow‐band gap comonomers into the polymer backbone or other chemical modification 7–9. In addition, many PF derivatives exhibit thermotropic liquid crystalline properties, which is another important property of PFs and have remarkably potential application for PLEDs 10–14. On the one hand, the PL and EL properties from light‐emitting polymer films can be enhanced by forming liquid crystalline domains inside the film via thermal annealing at nematic‐isotropic phase transition temperature (TNI) without employing additional photonic structures 15.…”

“…Since Grell et al reported liquid crystalline properties of PF for the first time,19 many blue‐light‐emitting PF derivatives have been found in a liquid crystalline (LC) state and undergo phase changes under thermal treatments rendering facile overall alignment, which can be applied for linearly polarized light 11–13, 20. However, very few green‐ or white‐light‐emitting PF derivatives with liquid crystalline properties have been explored.…”