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Transition Metal-Based Luminescent Materials and Their Applications
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Transition Metal-Based Luminescent Materials and Their Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (20 February 2022) | Viewed by 3967

Special Issue Editors

Dr. Matteo Mauro

E-Mail Website
Guest Editor
Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) 23, Université de Strasbourg, rue du Loess BP 43, F-67034 Strasbourg, France
Interests: inorganic photochemistry; photophysics; optoelectronics; bioimaging; stimuli-responsive materials; photoactive self-assembled materials; soft actuators
Dr. Cristina Cebrián Ávila

E-Mail Website
Guest Editor
Université de Lorraine Laboratoire Lorrain de Chimie Moléculaire (L2CM) – UMR 7053
Institut de Chimie, Physique et Matériaux (ICPM) 1 Boulevard François Arago F-57078 Metz, France
Interests: organic/organometallic synthesis, photophysics, photoactive systems, solar energy conversion, optoelectronics, green chemistry

Special Issue Information

Dear Colleagues,

Photoactive transition metal complexes (TMCs) have received great attention in the recent past from both fundamental and application research point of views. Much effort has been devoted to the study of complexes comprising second- and third-row transition metals with d6, d8, and d10 electronic configurations, such as Ir(III), Pt(II), Re(I), Ru(II), and Os(II), as well as first-row metals like Cu(I) and Zn(II). Particularly, a judicious combination of a metal ion and its coordination sphere results in compounds with peculiar photophysical properties and a rich redox behaviour, which can be finely tuned by a rational chemical design of the ligands. These compounds are typically characterized by long-lived excited states exhibiting triplet character after efficient intersystem crossing processes. As a result, enormous progress in the field of photoactive molecular and supramolecular TMC-containing materials has been achieved, also stimulated by their fascinating applications in several fields.

This Special Issue focuses on the most recent advances in the field of molecular and supramolecular materials based on phosphorescent TMCs and their applications, spanning from light-emitting devices and solar energy conversion to bioimaging and sensing. Full papers, short communications, and review articles presenting and discussing the most recent trends in the field are welcome.

Dr. Matteo Mauro
Dr. Cristina Cebrián Ávila
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. Materials is an international peer-reviewed open access semimonthly 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 2600 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

  • Transition metal complexes
  • Photo-induced processes
  • Organic light emitting diodes
  • Light-emitting electrochemical cells
  • Bioimaging
  • Electrogenerated chemiluminescence
  • Thermally activated delayed fluorescence
  • Solar cells

Published Papers (2 papers)

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Research

28 pages, 6142 KiB  
Article
Towards Optimized Photoluminescent Copper(I) Phenanthroline-Functionalized Complexes: Control of the Photophysics by Symmetry-Breaking and Spin–Orbit Coupling
by Christophe Gourlaouen and Chantal Daniel
Materials 2022, 15(15), 5222; https://doi.org/10.3390/ma15155222 - 28 Jul 2022
Cited by 4 | Viewed by 1235
Abstract
The electronic and structural alterations induced by the functionalization of the 1,10-phenanthroline (phen) ligand in [Cu(I) (phen-R2)2]+ complexes (R=H, CH3, tertio-butyl, alkyl-linkers) and their consequences on the luminescence properties and thermally activated delay fluorescence (TADF) [...] Read more.
The electronic and structural alterations induced by the functionalization of the 1,10-phenanthroline (phen) ligand in [Cu(I) (phen-R2)2]+ complexes (R=H, CH3, tertio-butyl, alkyl-linkers) and their consequences on the luminescence properties and thermally activated delay fluorescence (TADF) activity are investigated using the density functional theory (DFT) and its time-dependent (TD) extension. It is shown that highly symmetric molecules with several potentially emissive nearly-degenerate conformers are not promising because of low S1/S0 oscillator strengths together with limited or no S1/T1 spin–orbit coupling (SOC). Furthermore, steric hindrance, which prevents the flattening of the complex upon irradiation, is a factor of instability. Alternatively, linking the phenanthroline ligands offers the possibility to block the flattening while maintaining remarkable photophysical properties. We propose here two promising complexes, with appropriate symmetry and enough rigidity to warrant stability in standard solvents. This original study paves the way for the supramolecular design of new emissive devices. Full article
(This article belongs to the Special Issue Transition Metal-Based Luminescent Materials and Their Applications)
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13 pages, 3324 KiB  
Article
A Method to Realize Efficient Deep-Red Phosphorescent OLEDs with a Broad Spectral Profile and Low Operating Voltages
by Wei-Ling Chen, Shan-Yu Chen, Dun-Cheng Huang, Dian Luo, Hsueh-Wen Chen, Chih-Yuan Wang and Chih-Hao Chang
Materials 2021, 14(19), 5723; https://doi.org/10.3390/ma14195723 - 30 Sep 2021
Cited by 10 | Viewed by 2066
Abstract
Organic light-emitting diodes (OLEDs) used as phototherapy light sources require sufficient spectral distribution in the effective wavelength ranges and low operating voltages. Herein, a double emitting layer structure consisting of a red-emitting Ir(piq)2acac and a deep-red Ir(fliq)2acac was designed [...] Read more.
Organic light-emitting diodes (OLEDs) used as phototherapy light sources require sufficient spectral distribution in the effective wavelength ranges and low operating voltages. Herein, a double emitting layer structure consisting of a red-emitting Ir(piq)2acac and a deep-red Ir(fliq)2acac was designed to generate a broad electroluminescence spectrum. An efficient TCTA:CN-T2T exciplex system was used as the host of the emitting layer, facilitating effective energy transfer from the exciplex host to the red and deep-red phosphors. The materials used in the exciplex host were also used as the carrier transport layers to eliminate the energy barriers and thus increase the current density. The hole injection layer structures were varied to examine the hole injection capabilities and the carrier balance. The resulting optimized phosphorescent OLEDs with a broad spectral profile exhibit a 90% coverage ratio in the target ranges from 630 to 690 nm, together with a high peak efficiency of 19.1% (10.2 cd/A and 13.8 lm/W). The proposed device only needs 5.2 V to achieve a power density of 5 mW/cm2, implying that the device could be driven via two series-connected button cell batteries. These results illustrate the feasibility of our design concepts and demonstrate the realization of a portable and lightweight OLED phototherapy light source. Full article
(This article belongs to the Special Issue Transition Metal-Based Luminescent Materials and Their Applications)
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