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Crystals
Special Issues
Organic Optoelectronic Materials
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Organic Optoelectronic Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Liquid Crystals".

Deadline for manuscript submissions: closed (30 October 2020) | Viewed by 21329

Special Issue Editors

Prof. Dr. Ji-Hoon Lee

E-Mail Website
Guest Editor
Division of Electronics Engineering, Jeonbuk National University, Jeonju, Republic of Korea
Interests: optics; electrooptical materials; optical films; liquid crystals
Special Issues, Collections and Topics in MDPI journals
Dr. Van-Chuc Nguyen

E-Mail Website
Co-Guest Editor
School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
Interests: nano-materials; electrooptical materials; heterogeneous catalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Organic optoelectronic materials have been widely used in recent electronic devices. The modulation of a refractive index by an external electric or magnetic field can enable the modulation of phase and polarization of the output beam. Various kinds of applications were developed based on this phenomenon: phase and polarization modulation devices, liquid crystal display, holographic devices, etc. With the recent development of flexible electronics and flexible displays, the importance of organic optoelectronic materials has attracted more attention, and reliability in terms of the stretching, bending deformations is required. We invite researchers to submit papers on optoelectronic materials and devices. The issue includes synthesis of materials, optical and electrical properties of materials, and fabrication and instrumentation of optoelectronic devices.

Prof. Dr. Ji-Hoon Lee
Dr. Van-Chuc Nguyen
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2100 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Phase and polarization modulation materials
  • Electroluminescence and photoluminescence materials
  • Organic light-emitting diode materials
  • Polarized light-emitting materials
  • Liquid crystalline materials for display, telecommunication, and sensors
  • Coatable and printable materials for reflection and transmission control
  • Optoelectronic materials for stretchable, bendable applications

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Related Special Issue

Published Papers (6 papers)

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Editorial

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2 pages, 156 KiB  
Editorial
Organic Optoelectronic Materials
by Van-Chuc Nguyen and Ji-Hoon Lee
Crystals 2020, 10(11), 1015; https://doi.org/10.3390/cryst10111015 - 9 Nov 2020
Viewed by 2173
Abstract
Organic optoelectronic materials have been widely used in recent electronic devices [...] Full article
(This article belongs to the Special Issue Organic Optoelectronic Materials)

Research

Jump to: Editorial

6 pages, 1141 KiB  
Communication
Enhancement of Luminescence Dissymmetry Factor in Nano-Segregated Phase Generated by Phase Separation between Helical Nanofilaments and Liquid-Crystalline Smectic A Phase
by Jae-Jin Lee and Suk-Won Choi
Crystals 2020, 10(10), 952; https://doi.org/10.3390/cryst10100952 - 19 Oct 2020
Cited by 4 | Viewed by 2397
Abstract
Although several methods exist for the synthesis of circularly polarized luminescent (CPL) materials, the methods are extremely complex and tedious. In recent years, the chiral host-achiral luminescent guest method and the achiral host-achiral luminescent guest method have been employed to fabricate CPL materials; [...] Read more.
Although several methods exist for the synthesis of circularly polarized luminescent (CPL) materials, the methods are extremely complex and tedious. In recent years, the chiral host-achiral luminescent guest method and the achiral host-achiral luminescent guest method have been employed to fabricate CPL materials; however, the main disadvantage of the latter is the small luminescence dissymmetry factor (glum) that limits the practical applications of the method. Therefore, this study reports on the enhancement of glum in a nano-segregated phase system, generated by the phase separation between helical nanofilaments (HNFs; originating from an achiral bent-core molecule) and a liquid-crystalline (LC) smectic A (SmA) phase (originating from an achiral rod-like mesogen). The observed glum value in the nano-segregated phase between the HNFs and LC SmA phase was larger than that in the nano-segregated phase between the HNFs and LC nematic (N) phase. The enhancement of the glum value was attributed to the order parameter (S) of the dye molecules in the SmA phase being larger than that in the N phase. Therefore, we concluded that the S value of the fluorescent dye molecules, doped into the embedded LC phase between the HNFs, strongly influenced the glum value. Full article
(This article belongs to the Special Issue Organic Optoelectronic Materials)
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15 pages, 2110 KiB  
Article
Metal Complexes of π-Expanded Ligand (7): Syntheses, Structures and Properties of Pt(II) Complexes Containing the Isomeric 1- and 2-Alkyliminomethyl Pyrene Ligands
by Xuan-Dien Luong and Xuan-Truong Nguyen
Crystals 2020, 10(6), 476; https://doi.org/10.3390/cryst10060476 - 3 Jun 2020
Cited by 2 | Viewed by 3388
Abstract
A [O,N] bidentate π-expanded ligand system, (E)-1-(n-octylimino)methylpyren-2-ol (2), was newly synthesized via a six-step synthesis from pyrene. The ligand 2 reacts with [PtCl2(PhCN)2] in chlorobenzene and the presence of a base at reflux for 2 [...] Read more.
A [O,N] bidentate π-expanded ligand system, (E)-1-(n-octylimino)methylpyren-2-ol (2), was newly synthesized via a six-step synthesis from pyrene. The ligand 2 reacts with [PtCl2(PhCN)2] in chlorobenzene and the presence of a base at reflux for 2 h under the formation of (2(Pt)) complex with a yield of 70%. The molecular structure of (2(Pt)), studied by common spectroscopic methods and X-ray diffraction, shows a square planar geometry with a trans-configuration of the ligands. The molecular structure, absorption spectra, electrochemical properties, and phosphorescence characteristics of the (2(Pt)) complex are discussed, emphasizing the comparison with those of the previously reported Pt complex (1(Pt)) containing the isomeric ligands of 2, (E)-2-(n-octylimino)methylpyren-1-ol. The DFT calculations of the two Pt complexes are carried out and exhibit a clear explanation of the relationship between their physico-chemical characteristics. Full article
(This article belongs to the Special Issue Organic Optoelectronic Materials)
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18 pages, 4556 KiB  
Article
Switchable Lens Design for Multi-View 2D/3D Switching Display with Wide-Viewing Window
by Tae-Hyun Lee, Kyung-Il Joo and Hak-Rin Kim
Crystals 2020, 10(5), 418; https://doi.org/10.3390/cryst10050418 - 24 May 2020
Cited by 7 | Viewed by 4238
Abstract
We improved the three-dimensional (3D) crosstalk level of multi-view 3D displays using a lens array with small f-number, thereby facilitating a wide 3D viewing window. In particular, we designed a polarization-dependent-switching liquid crystal (LC)-based gradient refractive index (GRIN) lens array that could [...] Read more.
We improved the three-dimensional (3D) crosstalk level of multi-view 3D displays using a lens array with small f-number, thereby facilitating a wide 3D viewing window. In particular, we designed a polarization-dependent-switching liquid crystal (LC)-based gradient refractive index (GRIN) lens array that could be switched between 2D and 3D viewing modes. For the GRIN lens with a small f-number (1.08), we studied the effect of the interfacial curvature between the plano-concave isotropic polymer layer and the plano-convex birefringent LC layer on the aberration properties. We examined the conventional spherical, quadratic polynomial aspherical, and a high-order (fourth-order) polynomial aspherical curvature. For the high-order polynomial aspherical curvature, the achievable transverse spherical aberration (TSA = 10.2 µm) was considerably lower than that with the spherical (TSA = 100.3 µm) and quadratic polynomial aspherical (TSA = 30.4 µm) curvatures. Consequently, the angular luminance distributions for each view were sharper for the high-order polynomial interfacial curvature. We designed multi-view (43-view) 3D displays using the arrays of switchable LC lenses with different curvatures, and the average adjacent crosstalk levels within the entire viewing window (50°) were 68.5%, 73.3%, and 60.0% for the spherical, quadratic polynomial aspherical, and high-order polynomial aspherical curvatures, respectively. Full article
(This article belongs to the Special Issue Organic Optoelectronic Materials)
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11 pages, 7981 KiB  
Article
Pulsed Electrodeposition for Copper Nanowires
by Duc-Thinh Vuong, Ha-My Hoang, Nguyen-Hung Tran and Hyun-Chul Kim
Crystals 2020, 10(3), 218; https://doi.org/10.3390/cryst10030218 - 20 Mar 2020
Cited by 5 | Viewed by 3810
Abstract
Copper nanowires (Cu NWs) are a promising alternative to indium tin oxide (ITO), for use as transparent conductors that exhibit comparable performance at a lower cost. Furthermore, Cu NWs are flexible, a property not possessed by ITO. However, the Cu NW-based transparent electrode [...] Read more.
Copper nanowires (Cu NWs) are a promising alternative to indium tin oxide (ITO), for use as transparent conductors that exhibit comparable performance at a lower cost. Furthermore, Cu NWs are flexible, a property not possessed by ITO. However, the Cu NW-based transparent electrode has a reddish color and tends to deteriorate in ambient conditions due to the oxidation of Cu. In this paper, we propose a pulsed-current (PC) plating method to deposit nickel onto the Cu NWs in order to reduce oxidation over a 30-day period, and to minimize the sheet resistance. Additionally, the effects of the pulse current, duty cycle, and pulse frequency on the performance of the Cu–Ni (copper–nickel) NW films have also been investigated. As a result, the reddish color of the electrode was eliminated, as oxidation was completely suppressed, and the sheet resistance was reduced from 35 Ω/sq to 27 Ω/sq. However, the transmittance decreased slightly from 86% to 76% at a wavelength of 550 nm. The Cu–Ni NW electrodes also exhibited excellent long-term cycling stability after 6000 bending cycles. Our fabricated Cu–Ni electrodes were successfully applied in flexible polymer-dispersed liquid crystal smart windows. Full article
(This article belongs to the Special Issue Organic Optoelectronic Materials)
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12 pages, 4227 KiB  
Article
Analysis of Optical Performance Degradation in an Ion-Doped Liquid-Crystal Cell with Electrical Circuit Modeling
by Jeong-Ho Seo, Jae-Won Huh, Ho-Jin Sohn, Eunjung Lim and Tae-Hoon Yoon
Crystals 2020, 10(2), 55; https://doi.org/10.3390/cryst10020055 - 21 Jan 2020
Cited by 14 | Viewed by 4442
Abstract
We reported electrical circuit modeling to analyze the optical performance degradation in an ion-doped liquid-crystal (LC) cell, which exhibited advantages, such as excellent optical performance and simple switching process, but suffered from long-term reliability issues. When an electric field was applied to the [...] Read more.
We reported electrical circuit modeling to analyze the optical performance degradation in an ion-doped liquid-crystal (LC) cell, which exhibited advantages, such as excellent optical performance and simple switching process, but suffered from long-term reliability issues. When an electric field was applied to the cell for an extended period of time, the optical performance became nonuniform, and the haze in the opaque state decreased. By measuring the impedance and fitting the measured data by using an equivalent circuit model, we confirmed the changes of the parameters in the electrochemical impedance spectroscopy and electrophysical properties of the ion-doped LC cell with time. According to the measurement of the optical and physical characteristics, the optical performance degradation was caused mainly by the ionic materials. Full article
(This article belongs to the Special Issue Organic Optoelectronic Materials)
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