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Micromachines
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Semiconductor Nanocrystals for Light-Emitting and Display Applications
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Semiconductor Nanocrystals for Light-Emitting and Display Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 15868

Special Issue Editor

Dr. Gaoling Yang

E-Mail Website
Guest Editor
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
Interests: colloidal semiconductor nanocrystals; quantum dots; display; perovskite; nanophotonics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the field of information, displays are used everywhere. They are in our smart phones, laptops, TVs, cars, and will extended to AR/VR technology. Nanocrystals are regarded as one of the most promising emitters in displays due to tunable emission color, narrow emission peaks, and flexibility in device integration. Nanocrystal backlight technology have been brought to the forefront due to its use in new high-definition TVs over the past 3–5 years, and this technology is expected to be on the market within a few years. The application of nanocrystal-based electroluminescent technology and color conversion micro-LED is more difficult and has not yet achieved commercialization, but it is expected that the market space will be larger due to their superior performance after the breakthrough of related technologies. The present Special Issue on “Semiconductor Nanocrystals for Light-Emitting and Display Applications” will summarize the most recent progress and core technologies in this field, including but not limited to nanocrystal luminescent materials, quantum dot light-emitting diodes, color conversion micro-LEDs, chemical synthesis and photophysical properties, perovskite nanocrystals, and pixel patterning, as well as their full-color display applications. We expect that this multidisciplinary topic will provide new guidance for further light-emitting and display devices that are based on semiconductor nanocrystals.

Dr. Gaoling Yang
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. Micromachines 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 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

  • nanocrystals
  • quantum dots
  • perovskite
  • light-emitting diodes
  • micro-LED
  • display

Related Special Issue

Published Papers (5 papers)

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Review

17 pages, 2009 KiB  
Review
Perovskite Random Lasers, Process and Prospects
by Lei Wang, Mingqing Yang, Shiyu Zhang, Chunhui Niu and Yong Lv
Micromachines 2022, 13(12), 2040; https://0-doi-org.brum.beds.ac.uk/10.3390/mi13122040 - 22 Nov 2022
Cited by 5 | Viewed by 2101
Abstract
Random lasers (RLs) are a kind of coherent light source with optical feedback based on disorder-induced multiple scattering effects instead of a specific cavity. The unique feedback mechanism makes RLs different from conventional lasers. They have the advantages of small volume, flexible shape, [...] Read more.
Random lasers (RLs) are a kind of coherent light source with optical feedback based on disorder-induced multiple scattering effects instead of a specific cavity. The unique feedback mechanism makes RLs different from conventional lasers. They have the advantages of small volume, flexible shape, omnidirectional emission, etc., and have broad application prospects in the fields of laser illumination, speckle-free imaging, display, and sensing. Colloidal metal-halide perovskite nanomaterials are a hot research field in light sources. They have been considered as desired gain media owing to their superior properties, such as high photoluminescence, tunable emission wavelengths, and easy fabrication processes. In this review, we summarize the research progress of RLs based on perovskite nanomaterials. We first present the evolution of the RLs based on the perovskite quantum dots (QDs) and perovskite films. The fabrication process of perovskite nano-/microstructures and lasers is discussed in detail. After that, the frontier applications of perovskite RLs are discussed. Finally, the challenges are discussed, and the prospects for further development are proposed. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystals for Light-Emitting and Display Applications)
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11 pages, 1434 KiB  
Review
Microfluidic Synthesis, Doping Strategy, and Optoelectronic Applications of Nanostructured Halide Perovskite Materials
by Shuangyang Zou, Xiaoan Zhao, Wenze Ouyang and Shenghua Xu
Micromachines 2022, 13(10), 1647; https://0-doi-org.brum.beds.ac.uk/10.3390/mi13101647 - 30 Sep 2022
Cited by 1 | Viewed by 1665
Abstract
Halide perovskites are increasingly exploited as semiconducting materials in diverse optoelectronic applications, including light emitters, photodetectors, and solar cells. The halide perovskite can be easily processed in solution, making microfluidic synthesis possible. This review introduces perovskite nanostructures based on micron fluidic channels in [...] Read more.
Halide perovskites are increasingly exploited as semiconducting materials in diverse optoelectronic applications, including light emitters, photodetectors, and solar cells. The halide perovskite can be easily processed in solution, making microfluidic synthesis possible. This review introduces perovskite nanostructures based on micron fluidic channels in chemical reactions. We also briefly discuss and summarize several advantages of microfluidics, recent progress of doping strategies, and optoelectronic applications of light-sensitive nanostructured perovskite materials. The perspective of microfluidic synthesis of halide perovskite on optoelectronic applications and possible challenges are presented. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystals for Light-Emitting and Display Applications)
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28 pages, 3584 KiB  
Review
Cesium Lead Iodide Perovskites: Optically Active Crystal Phase Stability to Surface Engineering
by Yixi Wang, Hairong Zhao, Marek Piotrowski, Xiao Han, Zhongsheng Ge, Lizhuang Dong, Chengjie Wang, Sowjanya Krishna Pinisetty, Praveen Kumar Balguri, Anil Kumar Bandela and Udayabhaskararao Thumu
Micromachines 2022, 13(8), 1318; https://0-doi-org.brum.beds.ac.uk/10.3390/mi13081318 - 15 Aug 2022
Cited by 9 | Viewed by 3332
Abstract
Among perovskites, the research on cesium lead iodides (CsPbI3) has attracted a large research community, owing to their all-inorganic nature and promising solar cell performance. Typically, the CsPbI3 solar cell devices are prepared at various heterojunctions, and working at fluctuating [...] Read more.
Among perovskites, the research on cesium lead iodides (CsPbI3) has attracted a large research community, owing to their all-inorganic nature and promising solar cell performance. Typically, the CsPbI3 solar cell devices are prepared at various heterojunctions, and working at fluctuating temperatures raises questions on the material stability-related performance of such devices. The fundamental studies reveal that their poor stability is due to a lower side deviation from Goldschmidt’s tolerance factor, causing weak chemical interactions within the crystal lattice. In the case of organic–inorganic hybrid perovskites, where their stability is related to the inherent chemical nature of the organic cations, which cannot be manipulated to improve the stability drastically whereas the stability of CsPbI3 is related to surface and lattice engineering. Thus, the challenges posed by CsPbI3 could be overcome by engineering the surface and inside the CsPbI3 crystal lattice. A few solutions have been proposed, including controlled crystal sizes, surface modifications, and lattice engineering. Various research groups have been working on these aspects and had accumulated a rich understanding of these materials. In this review, at first, we survey the fundamental aspects of CsPbI3 polymorphs structure, highlighting the superiority of CsPbI3 over other halide systems, stability, the factors (temperature, polarity, and size influence) leading to their phase transformations, and electronic band structure along with the important property of the defect tolerance nature. Fortunately, the factors stabilizing the most effective phases are achieved through a size reduction and the efficient surface passivation on the delicate CsPbI3 nanocrystal surfaces. In the following section, we have provided the up-to-date surface passivating methods to suppress the non-radiative process for near-unity photoluminescence quantum yield, while maintaining their optically active phases, especially through molecular links (ligands, polymers, zwitterions, polymers) and inorganic halides. We have also provided recent advances to the efficient synthetic protocols for optically active CsPbI3 NC phases to use readily for solar cell applications. The nanocrystal purification techniques are challenging and had a significant effect on the device performances. In part, we summarized the CsPbI3-related solar cell device performances with respect to the device fabrication methods. At the end, we provide a brief outlook on the view of surface and lattice engineering in CsPbI3 NCs for advancing the enhanced stability which is crucial for superior optical and light applications. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystals for Light-Emitting and Display Applications)
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17 pages, 2253 KiB  
Review
Emerging Optoelectronic Devices Based on Microscale LEDs and Their Use as Implantable Biomedical Applications
by Haijian Zhang, Yanxiu Peng, Nuohan Zhang, Jian Yang, Yongtian Wang and He Ding
Micromachines 2022, 13(7), 1069; https://0-doi-org.brum.beds.ac.uk/10.3390/mi13071069 - 04 Jul 2022
Cited by 2 | Viewed by 2478
Abstract
Thin-film microscale light-emitting diodes (LEDs) are efficient light sources and their integrated applications offer robust capabilities and potential strategies in biomedical science. By leveraging innovations in the design of optoelectronic semiconductor structures, advanced fabrication techniques, biocompatible encapsulation, remote control circuits, wireless power supply [...] Read more.
Thin-film microscale light-emitting diodes (LEDs) are efficient light sources and their integrated applications offer robust capabilities and potential strategies in biomedical science. By leveraging innovations in the design of optoelectronic semiconductor structures, advanced fabrication techniques, biocompatible encapsulation, remote control circuits, wireless power supply strategies, etc., these emerging applications provide implantable probes that differ from conventional tethering techniques such as optical fibers. This review introduces the recent advancements of thin-film microscale LEDs for biomedical applications, covering the device lift-off and transfer printing fabrication processes and the representative biomedical applications for light stimulation, therapy, and photometric biosensing. Wireless power delivery systems have been outlined and discussed to facilitate the operation of implantable probes. With such wireless, battery-free, and minimally invasive implantable light-source probes, these biomedical applications offer excellent opportunities and instruments for both biomedical sciences research and clinical diagnosis and therapy. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystals for Light-Emitting and Display Applications)
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26 pages, 7368 KiB  
Review
Advances and Challenges in Heavy-Metal-Free InP Quantum Dot Light-Emitting Diodes
by Xiaojie Jiang, Zhen Fan, Li Luo and Lishuang Wang
Micromachines 2022, 13(5), 709; https://0-doi-org.brum.beds.ac.uk/10.3390/mi13050709 - 30 Apr 2022
Cited by 10 | Viewed by 5677
Abstract
Light-emitting diodes based on colloidal quantum dots (QLEDs) show a good prospect in commercial application due to their narrow spectral linewidths, wide color range, excellent luminance efficiency, and long operating lifetime. However, the toxicity of heavy-metal elements, such as Cd-based QLEDs or Pb-based [...] Read more.
Light-emitting diodes based on colloidal quantum dots (QLEDs) show a good prospect in commercial application due to their narrow spectral linewidths, wide color range, excellent luminance efficiency, and long operating lifetime. However, the toxicity of heavy-metal elements, such as Cd-based QLEDs or Pb-based perovskite QLEDs, with excellent performance, will inevitably pose a serious threat to people’s health and the environment. Among heavy-metal-free materials, InP quantum dots (QDs) have been paid special attention, because of their wide emission, which can, in principle, be tuned throughout the whole visible and near-infrared range by changing their size, and InP QDs are generally regarded as one of the most promising materials for heavy-metal-free QLEDs for the next generation displays and solid-state lighting. In this review, the great progress of QLEDs, based on the fundamental structure and photophysical properties of InP QDs, is illustrated systematically. In addition, the remarkable achievements of QLEDs, based on their modification of materials, such as ligands exchange of InP QDs, and the optimization of the charge transport layer, are summarized. Finally, an outlook is shown about the challenge faced by QLED, as well as possible pathway to enhancing the device performance. This review provides an overview of the recent developments of InP QLED applications and outlines the challenges for achieving the high-performance devices. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystals for Light-Emitting and Display Applications)
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