Highly Polarized Fluorescent Film Based on Aligned Quantum Rods by Contact Ink-Jet Printing Method

Abstract

In recent years, fluorescent quantum rods (QRs) receive much attention because of their properties of emitting specific wavelength polarized light with narrow full width at half maximum (FWHM). Therefore, QRs are usually aligned on devices, such as light emitting diodes, laser, and liquid crystal display (LCD), as a polarizer. In order to emit the light with a high degree of polarization (DOP), QRs need to be controlled and aligned almost along one direction on large-scaled devices. However, most of the proposed effective alignment approaches cannot be applied to a large area. Hence, we firstly propose the contact ink-jet printing (CIJP) method to align CdSe/CdS core/shell QRs. With the ink being printed, the QRs can move driven by ink flowing. Eventually, the QRs will be aligned along the printed trajectories and become a film with DOP of more than 40%. Furthermore, CIJP can realize arbitrarily large area fabrication without reducing DOP value. In the future, this method can be utilized to print on large-scaled substrates directly to fabricate polarized optoelectronic devices, and further applied to LCD backlights and optical lenses.

The mechanism of ligand-induced chiral transmission through a top-down selective domain etching process

“…9f (black)). 56 Meanwhile, as the etching progresses (Fig. 9f (red and blue)), the crystal shape of the etched samples (DR-3-2 and DR-3-4) gets degraded and the signal gradually decreases.…”

Electronic Structure and Excited State Dynamics of Cadmium Chalcogenide Nanorods

“…14 Mechanical stretching to align NR films has a trade-off between degree of alignment and robustness of the films, with higher degrees of stretching (>500%) achieving greater ordering of the film, but also higher risk of ripping or damaging the polymer film. 14 Additional methods to align NR assemblies include ligand− ligand interactions, 89,148−150 micellar assembly, 151 inkjet printing, 20,152,153 block copolymer directed assembly, 154−156 liquid interface assembly, 112,142,157 antisolvent−solvent-driven assembly, 158 and photoinduced assembly. 17,159 These techniques have also achieved high degrees of ordering within NR films, reaching theoretical maxima in terms of optical anisotropy for aligned NRs.…”

“…Additional methods to align NR assemblies include ligand–ligand interactions, ,− micellar assembly, inkjet printing, ,, block copolymer directed assembly, − liquid interface assembly, ,, antisolvent–solvent-driven assembly, and photoinduced assembly. , These techniques have also achieved high degrees of ordering within NR films, reaching theoretical maxima in terms of optical anisotropy for aligned NRs. Each of these techniques has trade-offs in efficiency of alignment, reproducibility, and ease of commercial application depending on the final goal of NR alignment, whether it be, for example, reduced reabsorption or directional and switchable emission.…”

Ink‐Based Additive Nanomanufacturing of Functional Materials for Human‐Integrated Smart Wearables

“…For example, Zhou et al demonstrated the application of contact inkjet printing to align CdSe/CdS core/shell heterostructures, which yields a highly polarized fluorescent film. [ 547 ] Kuykendall et al demonstrated the alloying of GaN with InN to form GaN/InGaN heterostructures for light‐emitting applications. [ 548 ] Such precise control of the NW heterostructure enables the integration of light‐emitting devices into individual NWs.…”