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Molecules
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Perovskite/Organic Light-Emitting Materials and Devices
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Perovskite/Organic Light-Emitting Materials and Devices

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 2647

Special Issue Editor

Prof. Dr. Roy Man-Keung Fung

E-Mail Website
Guest Editor
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China
Interests: organic electronics; organic light-emitting diode (OLED); perovskite LED (PeLED); thermally activated delayed fluorescence (TADF); thin film encapsulation; materials surface and interface

Special Issue Information

Dear Colleagues,

Organic light-emitting diodes (OLEDs) are considered a next-generation display and solid-state lighting technology with many attractive characteristics, such as their ability to self-emit, their vivid color, the face that they are thin, light, and flexible factor, their printability, fast response time, wide viewing angle, etc. Recently, perovskite materials have also gradually emerged in the field of light-emitting diodes because of their extremely low driving voltages, emission with very narrow full width at half maximum, lower manufacturing cost thanks to solution processing, etc.

Today, there are still a number of great challenges for OLEDs to be used in harsh working conditions, such as a long lifetime requirement (~60,000 hours) for TV display, high brightness requirement (~ 3000 nit) for augmented reality (AR) and virtual reality (VR) displays, and high power-efficiency requirement (~100 lm/W) for general lighting. Perovskite light-emitting diodes (PeLEDs) also suffer from poor stability, in which the general operation lifetime may be just hours or even a few minutes.

Thus, there are still many materials, devices, and processing developments worthy of deeper investigation. This Special Issue aims to cover recent developments in OLEDs and PeLEDs. Contributions to this Special Issue can be full research articles, short communications, and reviews focusing on recent advancements in OLEDs or PeLEDs. 

  • Functional materials
    • Charge–transport materials
    • Host and emissive materials
    • Ink materials for printing
    • Perovskite-related materials
    • Transparent metallic or oxide-based electrodes
    • Flexible substrates and electrodes
  • Device architectures
    • Tandem structures
    • Exciplex structures
    • TADF emissive mechanism
    • Light outcoupling structures
    • Electrode engineering
    • Surface and interface modification
  • Encapsulation
    • Stress-release materials
    • Thin film encapsulation
  • Processing techniques
    • Special vacuum deposition technique
    • Inkjet printing, slot-die coating, dip-coating techniques, etc.

Prof. Dr. Roy Man-Keung Fung
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 light-emitting diode
  • OLED
  • Perovskite light-emitting diode
  • PeLED
  • Organic electroluminescence
  • Flexible electronics
  • Organic electronics
  • Thin film encapsulation
  • TADF

Published Papers (1 paper)

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Research

19 pages, 2461 KiB  
Article
Pyrene-Benzimidazole Derivatives as Novel Blue Emitters for OLEDs
by Thenahandi Prasanthi Deepthika De Silva, Sang Gil Youm, Frank R. Fronczek, Girija Sahasrabudhe, Evgueni E. Nesterov and Isiah M. Warner
Molecules 2021, 26(21), 6523; https://doi.org/10.3390/molecules26216523 - 28 Oct 2021
Cited by 11 | Viewed by 2180
Abstract
Three novel small organic heterocyclic compounds: 2-(1,2-diphenyl)-1H-benzimidazole-7-tert-butylpyrene (compound A), 1,3-di(1,2-diphenyl)-1H-benzimidazole-7-tert-butylpyrene (compound B), and 1,3,6,8-tetra(1,2-diphenyl)-1H-benzimidazolepyrene (compound C) were synthesized and characterized for possible applications as blue OLED emitters. The specific molecular [...] Read more.
Three novel small organic heterocyclic compounds: 2-(1,2-diphenyl)-1H-benzimidazole-7-tert-butylpyrene (compound A), 1,3-di(1,2-diphenyl)-1H-benzimidazole-7-tert-butylpyrene (compound B), and 1,3,6,8-tetra(1,2-diphenyl)-1H-benzimidazolepyrene (compound C) were synthesized and characterized for possible applications as blue OLED emitters. The specific molecular design targeted decreasing intermolecular aggregation and disrupting crystallinity in the solid-state, in order to reduce dye aggregation, and thus obtain efficient pure blue photo- and electroluminescence. Accordingly, the new compounds displayed reasonably high spectral purity in both solution- and solid-states with average CIE coordinates of (0.160 ± 0.005, 0.029 ± 0.009) in solution and (0.152 ± 0.007, 0.126 ± 0.005) in solid-state. These compounds showed a systematic decrease in degree of crystallinity and intermolecular aggregation due to increasing steric hindrance, as revealed using powder X-ray diffraction analysis and spectroscopic studies. An organic light-emitting diode (OLED) prototype fabricated using compound B as the non-doped emissive layer displayed an external quantum efficiency (EQE) of 0.35 (±0.04)% and luminance 100 (±6) cd m−2 at 5.5 V with an essentially pure blue electroluminescence corresponding to CIE coordinates of (0.1482, 0.1300). The highest EQE observed from this OLED prototype was 4.3 (±0.3)% at 3.5 V, and the highest luminance of 290 (±10) cd m−2 at 7.5 V. These values were found comparable to characteristics of the best pure blue OLED devices based on simple fluorescent small-molecule organic chromophores. Full article
(This article belongs to the Special Issue Perovskite/Organic Light-Emitting Materials and Devices)
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