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Micromachines
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Advanced Optoelectronic Materials/Devices and Their Applications
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Advanced Optoelectronic Materials/Devices and Their Applications

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

Deadline for manuscript submissions: 25 May 2026 | Viewed by 6962

Special Issue Editors

Dr. Jing Wei

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: synthesis and optoelectronic devices based on halide perovskites
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Fangze Liu

E-Mail Website
Guest Editor
School of Interdisciplinary Sciences, Beijing Institute of Technology, Beijing 100081, China
Interests: photodetectors and radiation detectors based on low-dimensional materials and halide perovskites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Optoelectronic materials and devices play a pivotal role in modern technologies, enabling advances in photonics, renewable energy, displays, and sensing. With innovations in semiconductors, perovskites, 2D materials, and hybrid systems, these devices are driving breakthroughs in solar cells, LEDs, photodetectors, and next-generation imaging systems. Their applications span new energy, telecommunications, biomedical diagnostics, environmental monitoring, and the Internet of Things, highlighting their transformative potential across multiple disciplines. This Special Issue focuses on the latest research progress in optoelectronic materials and devices, including novel material design, single-crystal growth, thin-film interface optimization, device architecture engineering, and material/device stability, while also exploring fundamental operational mechanisms. The issue emphasizes current challenges and emerging opportunities in this fast-evolving field to foster breakthroughs in next-generation optoelectronic technologies. Topics of interest include, but are not limited to: novel optoelectronic materials; high-performance photodetectors, LEDs, and laser devices; perovskite and organic photovoltaics for energy conversion; flexible/wearable optoelectronics systems; device physics, stability, and scalable fabrication techniques; characterization of novel optoelectronic films and devices.

Dr. Jing Wei
Prof. Dr. Fangze Liu
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 250 words) can be sent to the Editorial Office for assessment.

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 2100 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

  • optoelectronic materials
  • device architecture
  • perovskite photovoltaics
  • flexible/wearable optoelectronics
  • stability
  • scalability
  • single crystal

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Related Special Issue

Published Papers (7 papers)

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Research

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11 pages, 8363 KB  
Article
Ultrafast Optical Analysis and Control of Spectral Flatness in Cavity-Less Electro-Optic Combs
by Xin Chen, Hongyu Zhang, Meicheng Fu, Huan Chen, Yi Zhang, Yao Xu, Mengjun Zhu, Wenjun Yi, Qi Yu, Junli Qi, Qi Huang, Yubo Luo and Xiujian Li
Micromachines 2026, 17(3), 350; https://doi.org/10.3390/mi17030350 - 12 Mar 2026
Viewed by 426
Abstract
The cavity-less electro-optic combs (EOCs), recognized for exceptional tunability, stability and high power, are a crucial enabler for the fields such as optical communications, precision measurement and metrology, and microwave photonics. This work systematically investigates the fundamental physical factors that govern the spectral [...] Read more.
The cavity-less electro-optic combs (EOCs), recognized for exceptional tunability, stability and high power, are a crucial enabler for the fields such as optical communications, precision measurement and metrology, and microwave photonics. This work systematically investigates the fundamental physical factors that govern the spectral flatness via ultrafast measurements and modeling simulations. The ultrafast analysis results demonstrate that, the finite effective modulation extinction ratio of the electro-optic intensity modulators will result in generation of coherent spectral components with identical frequencies but varying phases and amplitudes in ultrashort temporal scale, finally lead to remarkable spectral interference and further intensity fluctuations across the combs spectrum. Furthermore, the established mathematical relationship between the spectral flatness and the modulation extinction ratio of the intensity modulators exhibits a nonlinear dependence up to the third order. Cascading intensity modulators has been exploited to mitigate the spectral interference and improve the modulation extinction ratio, which has been verified by using home-made high sensitive autocorrelator and frequency-resolved optical gating (FROG), and finely spectral flatness of 0.54 dB among 11 lines has been achieved, which recognized for the first time that modulation extinction ratio related spectral interference phenomenon play a subtle role in EOCs generation. Furthermore, photonic analog-to-digital converters (PADCs) have been investigated and an obvious enhancement in signal-to-noise-and-distortion (SINAD) is achieved, These findings will provide crucial theoretical and experimental support for optimizing EOCs performance, and advance the development and application. Full article
(This article belongs to the Special Issue Advanced Optoelectronic Materials/Devices and Their Applications)
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10 pages, 2670 KB  
Article
Realization of High-Power Single-Frequency Continuous-Wave Tunable 689 nm Laser
by Jiao Wei, Jingru Qiao, Pixian Jin, Jing Su and Huadong Lu
Micromachines 2026, 17(2), 200; https://doi.org/10.3390/mi17020200 - 1 Feb 2026
Viewed by 449
Abstract
By analyzing the influence of the titanium–sapphire (Ti:S) crystal thermal effect on the laser resonator during the generation of a 689 nm laser, the thermal characteristics of the Ti:S crystal operating near the gain edge were investigated in this letter. On this basis, [...] Read more.
By analyzing the influence of the titanium–sapphire (Ti:S) crystal thermal effect on the laser resonator during the generation of a 689 nm laser, the thermal characteristics of the Ti:S crystal operating near the gain edge were investigated in this letter. On this basis, a Ti:S laser with high conversion efficiency suitable for operation at the wavelength of 689 nm was designed. Benefiting from the quantification of thermal effects, the beam waist size at the center of the Ti:S crystal was precisely controlled. Finally, a single-frequency continuous-wave 689 nm laser with an output power of 3.65 W was achieved, and the corresponding optical-to-optical conversion efficiency was up to 23.1%. Then, after locking the transmission peak of the inserted etalon to the resonance frequency of the resonator, the continuous-frequency tuning range of 17 GHz around 689 nm was realized by scanning the voltage applied to the piezoelectric transducer (PZT) mounted on the cavity mirror. Furthermore, based on the realized single-frequency continuous-wave tunable 689 nm laser source, the absorption spectra of strontium atoms near 689 nm were obtained, which established a promising method for preparing 689 nm laser sources designed for strontium atomic ensembles. Full article
(This article belongs to the Special Issue Advanced Optoelectronic Materials/Devices and Their Applications)
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13 pages, 7642 KB  
Article
Mid-Wave Infrared Polarization Combiner Based on Reflective Metasurface
by Lulu Yang, Xin Wang, Xuhui Li and Liquan Dong
Micromachines 2026, 17(1), 36; https://doi.org/10.3390/mi17010036 - 28 Dec 2025
Viewed by 790
Abstract
Polarization beam combining (PBC) is an important technology for enhancing laser brightness. The conventional bulk polarization beam combiners are Brewster plates and birefringent polarization prisms. However, in the mid- and long-wave infrared range, the beam combining performance is limited by the transmission and [...] Read more.
Polarization beam combining (PBC) is an important technology for enhancing laser brightness. The conventional bulk polarization beam combiners are Brewster plates and birefringent polarization prisms. However, in the mid- and long-wave infrared range, the beam combining performance is limited by the transmission and birefringent coefficient of the available materials. In this paper, a polarization beam combiner based on a reflection metasurface was proposed. The phases of incident beams with orthogonal linear polarizations were individually manipulated by the side lengths of the rectangular silicon pillar. A metasurface polarization beam combiner operating band was designed and fabricated. When the two beams at 4.6 μm with orthogonal linear polarizations were incident on the metasurface at angles of −13.3° and 13.3°, respectively, they were reflected in the 0°-direction. The overall beam combining efficiency was 88.9%. When both of the quantum cascade lasers used in the experiments were in the fundamental transverse Gaussian mode, the measured beam quality factors M2 of the combined beam were 1.21 and 1.14 along the fast and slow axes, respectively. Both simulation and experimental results demonstrated that the proposed metasurface was an efficient polarization beam combiner with negligible wavefront distortion. It is a promising alternative to traditional bulk optics for the mid- and long-wave infrared. Full article
(This article belongs to the Special Issue Advanced Optoelectronic Materials/Devices and Their Applications)
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17 pages, 7379 KB  
Article
A Study on Visible Light Communication Systems Based on OLED Devices
by Wanyi Zhang, Haochen Xu, Sihang Ji and Jiazhuang Lan
Micromachines 2025, 16(12), 1338; https://doi.org/10.3390/mi16121338 - 27 Nov 2025
Viewed by 1225
Abstract
Addressing the limitations of conventional inorganic light-emitting diodes (LEDs) in flexible visible light communication (VLC) applications, this study investigates the feasibility of organic light-emitting diodes (OLEDs) as an integrated platform for illumination, display, and communication. The optoelectronic characteristics and modulation bandwidth of red, [...] Read more.
Addressing the limitations of conventional inorganic light-emitting diodes (LEDs) in flexible visible light communication (VLC) applications, this study investigates the feasibility of organic light-emitting diodes (OLEDs) as an integrated platform for illumination, display, and communication. The optoelectronic characteristics and modulation bandwidth of red, green, and blue (RGB) OLEDs were systematically measured. Based on the experimental data, a wavelength division multiplexing (WDM) VLC system employing non-return-to-zero on-off keying (NRZ-OOK) modulation was constructed in simulation software for validation. The results indicate stable optoelectronic performance for all three primary-color OLEDs, with a maximum modulation bandwidth of 466 kHz achieved for the blue device. The system simulation demonstrates stable parallel transmission of three independent data channels, attaining a minimum bit error rate (BER) as low as 3.74×10−35 achieved for the green device. This work confirms the potential of OLEDs for emerging communication applications such as flexible displays and wearable devices. Full article
(This article belongs to the Special Issue Advanced Optoelectronic Materials/Devices and Their Applications)
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10 pages, 5463 KB  
Article
High-Power Single-Frequency Continuous-Wave Tunable 1064/532 nm Dual-Wavelength Laser
by Weina Peng, Pixian Jin, Jing Su, Jiao Wei and Huadong Lu
Micromachines 2025, 16(11), 1201; https://doi.org/10.3390/mi16111201 - 23 Oct 2025
Cited by 1 | Viewed by 1300
Abstract
A high-power single-frequency continuous-wave wideband continuously tunable dual-wavelength laser at 1064/532 nm is presented in this paper. Firstly, a thermally insensitive cavity containing a type-I phase-matching LiB3O5 crystal and an uncoated quartz etalon was specially designed, which provided the fundamental [...] Read more.
A high-power single-frequency continuous-wave wideband continuously tunable dual-wavelength laser at 1064/532 nm is presented in this paper. Firstly, a thermally insensitive cavity containing a type-I phase-matching LiB3O5 crystal and an uncoated quartz etalon was specially designed, which provided the fundamental condition for the generation of a high-power single-frequency 1064 nm and 532 nm laser. By carefully optimizing the mode matching, the maximal output powers of 13.3 W at 1064 nm and 12.5 W at 532 nm were achieved when the pump power was 63.7 W, and the total optical–optical efficiency of 40.5% was achieved. After the transmission peak of etalon was locked to the oscillating frequency of the resonator, the continuous frequency tuning ranges of the achieved laser were as wide as 26.75 GHz at 1064 nm and 53.5 GHz at 532 nm. Full article
(This article belongs to the Special Issue Advanced Optoelectronic Materials/Devices and Their Applications)
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18 pages, 4583 KB  
Article
Bright Blue Light Emission of ZnCl2-Doped CsPbCl1Br2 Perovskite Nanocrystals with High Photoluminescence Quantum Yield
by Bo Feng, Youbin Fang, Jin Wang, Xi Yuan, Jihui Lang, Jian Cao, Jie Hua and Xiaotian Yang
Micromachines 2025, 16(8), 920; https://doi.org/10.3390/mi16080920 - 9 Aug 2025
Viewed by 1306
Abstract
The future development of perovskite light-emitting diodes (LEDs) is significantly limited by the poor stability and low brightness of the pure-blue emission in the wavelength range of 460–470 nm. In this study, the Cl/Br element ratio in CsPbClxBr3−x perovskite nanocrystals [...] Read more.
The future development of perovskite light-emitting diodes (LEDs) is significantly limited by the poor stability and low brightness of the pure-blue emission in the wavelength range of 460–470 nm. In this study, the Cl/Br element ratio in CsPbClxBr3−x perovskite nanocrystals (NCs) was modulated to precisely control their blue emission in the 428–512 nm spectral region. Then, the undoped CsPbCl1Br2 and the ZnCl2-doped CsPbCl1Br2 perovskite NCs were synthesized via the hot-injection method and investigated using variable-temperature photoluminescence (PL) spectroscopy. The PL emission peak of the ZnCl2-doped CsPbCl1Br2 perovskite NCs exhibits a blue shift from 475 nm to 460 nm with increasing ZnCl2 doping concentration. Additionally, the ZnCl2-doped CsPbCl1Br2 perovskite NCs show a high photoluminescence quantum yield (PLQY). The variable-temperature PL spectroscopy results show that the ZnCl2-doped CsPbCl1Br2 perovskite NCs have a larger exciton binding energy than the CsPbCl1Br2 perovskite NCs, which is indicative of a potentially higher PL intensity. To assess the stability of the perovskite NCs, high-temperature experiments and ultraviolet-irradiation experiments were conducted. The results indicate that zinc doping is beneficial for improving the stability of the perovskite NCs. The ZnCl2-doped CsPbCl1Br2 perovskite NCs were post-treated using didodecylammonium bromide, and after the post-treatment, the PLQY increased to 83%. This is a high PLQY value for perovskite NC-LEDs in the blue spectral range, and it satisfies the requirements of practical display applications. This work thus provides a simple preparation method for pure blue light-emitting materials. Full article
(This article belongs to the Special Issue Advanced Optoelectronic Materials/Devices and Their Applications)
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Review

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20 pages, 2024 KB  
Review
Research Progress of Hyperfluorescent Organic Electroluminescent Devices
by Yaxin Li, Jiaqi Wang, Chaoteng Pan, Xin Jiang, He Dong, Jin Wang and Gang Zhang
Micromachines 2026, 17(1), 40; https://doi.org/10.3390/mi17010040 - 29 Dec 2025
Viewed by 881
Abstract
Organic light-emitting diodes (OLEDs) have the advantages of high efficiency and high color purity, which gives them great potential and application prospects in the field of display technology, and thus they have been of wide interest for scholars and industry. Due to their [...] Read more.
Organic light-emitting diodes (OLEDs) have the advantages of high efficiency and high color purity, which gives them great potential and application prospects in the field of display technology, and thus they have been of wide interest for scholars and industry. Due to their nature, when using the first generation of fluorescent materials, only 25% of the excitons are used, while the rest are wasted, meaning the device efficiency does not exceed 25%. The second generation of phosphorescent materials solves this problem by utilizing 25% singlet excitons while utilizing 75% triplet excitons, achieving 100% internal quantum efficiency. Therefore, a third generation of materials, namely Thermally Activated Delayed Fluorescence (TADF) materials, has been developed, and these are able to use the small singlet–triplet energy gap to allow excitons on the triplet state to upconvert back to the single state, which improves the utilization of triplet excitons. These TADF materials can also reach 100% maximum internal quantum efficiency, but they have many problems, such as low color purity and serious efficiency roll-off. Therefore, researchers have designed hyperfluorescent materials, which possess high efficiency, high color purity, and a long lifetime, showing tremendous potential and application prospects in the field of display technology. This report takes hyperfluorescent OLEDs as the entry point and the molecular design and luminescence mechanism of hyperfluorescent materials are reviewed, considering blue, green, red, and white light. Full article
(This article belongs to the Special Issue Advanced Optoelectronic Materials/Devices and Their Applications)
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