Light Emitting Devices: From Fundamental Research to Applications

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

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 4650

Special Issue Editor


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Guest Editor
Electronics Department, National Institute of Astrophysics, Optics and Electronics (INAOE), Puebla 72840, Mexico
Interests: nanostructured materials; photo- and electroluminescence; photodetectors; resistive switching devices

Special Issue Information

Dear Colleagues,

The synthesis of luminescent materials has attracted extensive research for multiple applications, including more efficient photovoltaic devices, electro-optical and opto-electronic conversion, as well as light-emitting devices (LED). Nanostructured materials, quantum dots (QDs), thin film multilayers, and even organic-inorganic hybrid composites are some of the alternatives that have been explored to obtain more efficient devices, including for flexible applications. The modulation of bandgap energy through the QD size, the presence of different luminescent defects by changing the stoichiometry of the material, or the energy transfer phenomenon offers new ways to control the luminescence of a LED with a specific wavelength or at a broad spectrum, the latter for white light sources. Despite enormous efforts denoted by countless studies published on the development of different luminescent materials, it is still necessary to solve problems as basic as the need for a better understanding of the emission mechanisms to obtain an efficient electroluminescent transformation process.

In order to move forward in the development, understanding, and application of such materials, the purpose of this Special Issue is to review and present the latest knowledge on luminescent materials for their application in light-emitting devices. Authors are encouraged to submit original research as well as review articles on the aforementioned subjects.

Dr. Alfredo Morales Sánchez
Guest Editor

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Keywords

  • synthesis and characterization of luminescent materials
  • quantum dots, wells, and wires
  • material compounds
  • thin film multilayers
  • nanostructured materials and devices
  • amorphous and crystalline nanomaterials
  • luminescence mechanisms
  • electroluminescent devices and characterization

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Published Papers (2 papers)

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Research

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8 pages, 2602 KiB  
Article
Synthesis of Er3+:YAG Nanocrystals and Comparative Spectroscopic Analysis with Bulk Counterparts
by Chris Rightsell, David Sanchez, José Escudero, Eduardo Ortega, Gangadharan Ajithkumar, Dhiraj Sardar and Arturo Ponce
Micromachines 2023, 14(2), 255; https://doi.org/10.3390/mi14020255 - 19 Jan 2023
Viewed by 1599
Abstract
Single-crystal Er3+:YAG has long been used as a laser material, and recent work has shown polycrystalline ceramic Er3+:YAG to be a suitable laser material, with benefits of lower cost and easier production. However, relatively little work has been done [...] Read more.
Single-crystal Er3+:YAG has long been used as a laser material, and recent work has shown polycrystalline ceramic Er3+:YAG to be a suitable laser material, with benefits of lower cost and easier production. However, relatively little work has been done with the synthesis and spectroscopic characterization of Er3+:YAG nanocrystals. In this work, we present the synthesis of nanocrystalline Er3+:YAG and the results of comparative spectroscopic characterization with single-crystal and polycrystalline ceramic counterparts. The results show good agreement between the optical properties of the three hosts, with the nanocrystals demonstrating relatively higher intensity in the 1.53 μm emission. These results demonstrate the viability of Er3+:YAG nanocrystals as a potential laser material. Full article
(This article belongs to the Special Issue Light Emitting Devices: From Fundamental Research to Applications)
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Review

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25 pages, 3606 KiB  
Review
Synergistic Electric and Thermal Effects of Electrochromic Devices
by Meng Yuan, Hanlin Yin, Yitong Liu, Xiaohua Wang, Long Yuan and Yu Duan
Micromachines 2022, 13(12), 2187; https://doi.org/10.3390/mi13122187 - 10 Dec 2022
Cited by 7 | Viewed by 2363
Abstract
Electrochromic devices are the preferred devices for smart windows because they work independently of uncontrollable environmental factors and rely more on the user’s personal feelings to adjust actively. However, in practical applications, the ambient temperature still has an impact on device performance, such [...] Read more.
Electrochromic devices are the preferred devices for smart windows because they work independently of uncontrollable environmental factors and rely more on the user’s personal feelings to adjust actively. However, in practical applications, the ambient temperature still has an impact on device performance, such as durability, reversibility and switching performance, etc. These technical issues have significantly slowed down the commercialization of electrochromic devices (ECDs). It is necessary to investigate the main reasons for the influence of temperature on the device and make reasonable optimization to enhance the effectiveness of the device and extend its lifetime. In recent years, with the joint efforts of various outstanding research teams, the performance of electrochromic devices has been rapidly improved, with a longer lifetime, richer colors, and better color contrast. This review highlights the important research on temperature–dependent electrochromic properties in recent years. Also, the reported structures, mechanisms, characteristics, and methods for improving electrochromic properties are discussed in detail. In addition, the challenges and corresponding strategies in this field are presented in this paper. This paper will inspire more researchers to enrich the temperature–dependent properties of ECDs and their related fields with innovative means and methods to overcome the technical obstacles faced. Full article
(This article belongs to the Special Issue Light Emitting Devices: From Fundamental Research to Applications)
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