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Molecules
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Light-Emitting Diodes Based on Organic Materials and Quantum Dots
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Light-Emitting Diodes Based on Organic Materials and Quantum Dots

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Applied Chemistry".

Deadline for manuscript submissions: closed (30 October 2021) | Viewed by 14895

Special Issue Editor

Prof. Dr. Hong Meng

E-Mail Website
Guest Editor
School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen 518055, China
Interests: organic optoelectronic materials and devices

Special Issue Information

Dear Colleagues,

Organic and quantum dot-based light-emitting diodes (LEDs) manifest high performance with good operational stability, this has enabled their application in versatile fields, such as solid-state lighting and full-color displays. Meanwhile, perovskite LEDs exhibit sky-rocketing external quantum efficiencies with fascinating optoelectronic features, thereby perovskite LEDs have emerged as a potential competitor to current state-of-the-art LED technologies. This Special Issue aims to provide a platform to spotlight the most recent progress, both theoretical and experimental, in the field of LEDs based on organic materials and quantum dots. The topics of this Special Issue include, but are not limited to, the following:

  • Growth of organic and quantum-dot light-emitting materials
  • Organic LEDs
  • Quantum dot-based LEDs
  • Perovskite LEDs
  • Device optimization
  • New charge injection and transport layers
  • Interface engineering
  • Operational stability
  • Efficiency roll-off
  • Light outcoupling and management approaches
  • Flexible and stretchable LEDs
  • Applications in lighting and displays

We would like to take this opportunity to invite you to submit your research findings to the Special Issue on “Light-Emitting Diodes Based on Organic Materials and Quantum Dots”. Full research articles, short communications and comprehensive review papers are welcome.

Prof. Dr. Hong Meng
Guest Editor

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. Molecules 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 2700 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

  • organic semiconductors
  • quantum-dots
  • perovskites
  • light-emitting diodes
  • interface engineering
  • external quantum efficiency
  • efficiency roll-off
  • stability
  • applications

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Published Papers (4 papers)

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Research

11 pages, 2193 KiB  
Article
Narrowband Deep-Blue Multi-Resonance Induced Thermally Activated Delayed Fluorescence: Insights from the Theoretical Molecular Design
by Yuting Wu, Yanan Zhu, Zewei Zhang, Chongguang Zhao, Junpeng He, Chaoyi Yan and Hong Meng
Molecules 2022, 27(2), 348; https://doi.org/10.3390/molecules27020348 - 6 Jan 2022
Cited by 3 | Viewed by 4871
Abstract
Multi-resonance thermal activated delayed fluorescence (MR-TADF) has been promising with large oscillator strength and narrow full width at half maxima of luminescence, overcoming the compromise of emission intensity and energy criteria of traditional charge transfer TADF frameworks. However, there are still limited theoretical [...] Read more.
Multi-resonance thermal activated delayed fluorescence (MR-TADF) has been promising with large oscillator strength and narrow full width at half maxima of luminescence, overcoming the compromise of emission intensity and energy criteria of traditional charge transfer TADF frameworks. However, there are still limited theoretical investigations on the excitation mechanism and systematic molecular manipulation of MR-TADF structures. We systematically study the highly localized excitation (LE) characteristics based on typical blue boron-nitrogen (BN) MR-TADF emitters and prove the potential triangular core with theoretical approaches. A design strategy by extending the planar π-conjugate core structure is proposed to enhance the multiple resonance effects. Moreover, several substituted groups are introduced to the designed core, achieving color-tunable functions with relatively small energy split and strong oscillator strength simultaneously. This work provides a theoretical direction for molecular design strategy and a series of potential candidates for highly efficient BN MR-TADF emitters. Full article
(This article belongs to the Special Issue Light-Emitting Diodes Based on Organic Materials and Quantum Dots)
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15 pages, 3171 KiB  
Article
Deep-Red and Near-Infrared Iridium Complexes with Fine-Tuned Emission Colors by Adjusting Trifluoromethyl Substitution on Cyclometalated Ligands Combined with Matched Ancillary Ligands for Highly Efficient Phosphorescent Organic Light-Emitting Diodes
by Shuonan Chen, Hai Bi, Wenjing Tian and Yu Liu
Molecules 2022, 27(1), 286; https://doi.org/10.3390/molecules27010286 - 4 Jan 2022
Cited by 12 | Viewed by 2328
Abstract
Six novel Ir(C^N)2(L^X)-type heteroleptic iridium complexes with deep-red and near-infrared region (NIR)-emitting coverage were constructed through the cross matching of various cyclometalating (C^N) and ancillary (LX) ligands. Here, three novel C^N ligands were designed by introducing the electron-withdrawing group CF3 [...] Read more.
Six novel Ir(C^N)2(L^X)-type heteroleptic iridium complexes with deep-red and near-infrared region (NIR)-emitting coverage were constructed through the cross matching of various cyclometalating (C^N) and ancillary (LX) ligands. Here, three novel C^N ligands were designed by introducing the electron-withdrawing group CF3 on the ortho (o-), meta (m-), and para (p-) positions of the phenyl ring in the 1-phenylisoquinoline (piq) group, which were combined with two electron-rich LX ligands (dipba and dipg), respectively, leading to subsequent iridium complexes with gradually changing emission colors from deep red (≈660 nm) to NIR (≈700 nm). Moreover, a series of phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated by employing these phosphors as dopant emitters with two doping concentrations, 5% and 10%, respectively. They exhibited efficient electroluminescence (EL) with significantly high EQE values: >15.0% for deep red light0 (λmax = 664 nm) and >4.0% for NIR cases (λmax = 704 nm) at a high luminance level of 100 cd m−2. This work not only provides a promising approach for finely tuning the emission color of red phosphors via the easily accessible molecular design strategy, but also enables the establishment of an effective method for enriching phosphorescent-emitting molecules for practical applications, especially in the deep-red and near-infrared region (NIR). Full article
(This article belongs to the Special Issue Light-Emitting Diodes Based on Organic Materials and Quantum Dots)
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Graphical abstract

12 pages, 2655 KiB  
Article
Phenoxazine-Dibenzothiophene Sulfoximine Emitters Featuring Both Thermally Activated Delayed Fluorescence and Aggregation Induced Emission
by Yiyu Yang, Ran Xiao, Xiaosong Cao, Zhanxiang Chen, Xialei Lv, Youming Zhang, Shaolong Gong, Yang Zou and Chuluo Yang
Molecules 2021, 26(17), 5243; https://doi.org/10.3390/molecules26175243 - 29 Aug 2021
Cited by 5 | Viewed by 2648
Abstract
In this work, we demonstrate dibenzothiophene sulfoximine derivatives as building blocks for constructing emitters featuring both thermally activated delayed fluorescent (TADF) and aggregation-induced emission (AIE) properties, with multiple advantages including high chemical and thermal stability, facile functionalization, as well as tunable electron-accepting ability. [...] Read more.
In this work, we demonstrate dibenzothiophene sulfoximine derivatives as building blocks for constructing emitters featuring both thermally activated delayed fluorescent (TADF) and aggregation-induced emission (AIE) properties, with multiple advantages including high chemical and thermal stability, facile functionalization, as well as tunable electron-accepting ability. A series of phenoxazine-dibenzothiophene sulfoximine structured TADF emitters were successfully synthesized and their photophysical and electroluminescent properties were evaluated. The electroluminescence devices based on these emitters displayed diverse emissions from yellow to orange and reached external quantum efficiencies (EQEs) of 5.8% with 16.7% efficiency roll-off at a high brightness of 1000 cd·m−2. Full article
(This article belongs to the Special Issue Light-Emitting Diodes Based on Organic Materials and Quantum Dots)
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Graphical abstract

11 pages, 2719 KiB  
Article
A Novel Deep Blue LE-Dominated HLCT Excited State Design Strategy and Material for OLED
by Xuzhou Tian, Jiyao Sheng, Shitong Zhang, Shengbing Xiao, Ying Gao, Haichao Liu and Bing Yang
Molecules 2021, 26(15), 4560; https://doi.org/10.3390/molecules26154560 - 28 Jul 2021
Cited by 26 | Viewed by 4312
Abstract
Deep blue luminescent materials play a crucial role in the organic light-emitting diodes (OLEDs). In this work, a novel deep blue molecule based on hybridized local and charge-transfer (HLCT) excited state was reported with the emission wavelength of 423 nm. The OLED based [...] Read more.
Deep blue luminescent materials play a crucial role in the organic light-emitting diodes (OLEDs). In this work, a novel deep blue molecule based on hybridized local and charge-transfer (HLCT) excited state was reported with the emission wavelength of 423 nm. The OLED based on this material achieved high maximum external quantum efficiency (EQE) of 4% with good color purity. The results revealed that the locally-excited (LE)-dominated HLCT excited state had obvious advantages in short wavelength and narrow spectrum emission. What is more, the experimental and theoretical combination was used to describe the excited state characteristic and to understand photophysical property. Full article
(This article belongs to the Special Issue Light-Emitting Diodes Based on Organic Materials and Quantum Dots)
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