Photoluminescent Color and Polarized Light Emission Tuning of Fluorene Derivatives Using a Photoreactive H‐Bonded Liquid Crystalline Polymer

Abstract

Three fluorene (FL) derivatives with pyridine end groups were synthesized to control the photoluminescence (PL) wavelength and polarized light emission using a photoreactive H‐bonded polymer containing cinnamic acid side groups (P6CAM). The FL derivatives, which possessed pyridine end groups, formed H‐bonds with cinnamic acid, and changed the PL behavior of the derivatives. The controllability λmax of the PL depended on the position of the N‐atom at the pyridine end group and the degree of the photoreaction of the P6CAM. For F1, λmax of the PL was tuned from 470 to 518 nm. Employing P6CAM as the photoalignment layer to reorient the cinnamic acid side groups realized polarized PL up to PL||/PL⟂ = 3.9. Furthermore, photopatterning of the PL color and the direction of the polarized light emission using patterned P6CAM films were demonstrated.magnified image

Tuning Photoluminescent Wavelength of Water-Soluble Oligothiophene/Polymer Complex Film by Proton Bonding

“…The maximum shift of PL was a little longer though the shift range was smaller than our previous report of FL derivatives. 5 These results indicate that 3Th-MP easily forms a protonated structure with stable, soluble, and long-wavelength emissive structure by adding strong acids 6 while no gradient change occurred in maximum wavelength due to formation of H-bonding as we previously reported. Next, aqueous polystyrene sulfonic acid (PSS) solution was used to prepare protonated 3Th-MP.…”

“…5 Furthermore, we succeeded in simultaneous light-driven patterning of molecular alignment and photoluminescent behavior of FL derivatives by using hydrogen-bonded photocrosslinkable liquid-crystalline polymer films as an alignment layer. 6 In this work, we used oligothiophene with pyridiyl ring alternatively to achieve longer-wavelength emission with simple structure. Oligothiophenes are promising ³-conjugated materials for organic semiconductors, photovoltanic devices, as well as photoluminescent devices though tunability of optoelectrical properties by acidity have not yet been much explored because of poor solubility in water.…”

Functional liquid-crystalline polymers and supramolecular liquid crystals

“…96 On the basis of the supramolecular design described above, functional supramolecular LC polymers have been developed ( Figure 6). 51,[97][98][99][100][101][102][103][104][105] Ferroelectricity can be induced for hydrogenbonded LC polymer 15 exhibiting chiral smectic C phases. 51 Chiral hydrogen-bond acceptors are used to form supramolecular LC polymers that show spontaneous polarization.…”

“…98 Polarized emission and photoluminescent color tuning of fluorene derivatives were also reported by using photoreactive hydrogen-bonded LC polymers. 99 Photo-responsive materials were developed based on azobenzene-containing LC supramolecular polymer networks. 100 Supramolecular LC polymers have been applied for ion-and electron-conductive materials.…”

Patterned Immobilization of a Luminescent Ru(II) Complex in Polymer Films Using the Photoreaction of Benzyl thiocyanate: Toward Color Emission Tuning of Electroluminescent Devices

“…Moreover, we have investigated the possibility to apply this approach for color tuning of OLEDs which could offer an auspicious alternative to existing techniques 10–14. The success of fabrication of full color displays depends on appropriate methods for the pixelation of the emissive layer.…”