scholarly journals Improved Charge Injection and Transport of Light-Emitting Diodes Based on Two-Dimensional Materials

2019 ◽  
Vol 9 (19) ◽  
pp. 4140 ◽  
Author(s):  
Yuanming Zhou ◽  
Sijiong Mei ◽  
Dongwei Sun ◽  
Neng Liu ◽  
Fei Mei ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Two Dimensional ◽  
Effective Electron ◽  
Light Emitting ◽  
Two Dimensional Materials ◽  
Materials Used

Light-emitting diodes (LEDs) are considered to be the most promising energy-saving technology for future lighting and display. Two-dimensional (2D) materials, a class of materials comprised of monolayer or few layers of atoms (or unit cells), have attracted much attention in recent years, due to their unique physical and chemical properties. Here, we summarize the recent advances on the applications of 2D materials for improving the performance of LEDs, including organic light emitting diodes (OLEDs), quantum dot light emitting diodes (QLEDs) and perovskite light emitting diodes (PeLEDs), using organic films, quantum dots and perovskite films as emission layers (EMLs), respectively. Two dimensional materials, including graphene and its derivatives and transition metal dichalcogenides (TMDs), can be employed as interlayers and dopant in composite functional layers for high-efficiency LEDs, suggesting the extensive application in LEDs. The functions of 2D materials used in LEDs include the improved work function, effective electron blocking, suppressed exciton quenching and reduced surface roughness. The potential application of 2D materials in PeLEDs is also presented and analyzed.

scholarly journals Photo-Detectors Based on Two Dimensional Materials

2021 ◽  
Author(s):  
Mubashir A. Kharadi ◽  
Gul Faroz A. Malik ◽  
Farooq A. Khanday
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Optoelectronic Devices ◽  
Two Dimensional ◽  
Wide Range ◽  
Two Dimensional Materials ◽  
Photo Detectors ◽  
Metal Dichalcogenides ◽  
Application Specific

2D materials like transition metal dichalcogenides, black phosphorous, silicene, graphene are at the forefront of being the most potent 2D materials for optoelectronic applications because of their exceptional properties. Several application-specific photodetectors based on 2D materials have been designed and manufactured due to a wide range and layer-dependent bandgaps. Different 2D materials stacked together give rise to many surprising electronic and optoelectronic phenomena of the junctions based on 2D materials. This has resulted in a lot of popularity of 2D heterostructures as compared to the original 2D materials. This chapter presents the progress of optoelectronic devices (photodetectors) based on 2D materials and their heterostructures.

The Role of Two-Dimensional Materials in Electromagnetic Interference Shielding

2021 ◽  
pp. 1254-1270
Author(s):  
Rafael Vargas-Bernal
Keyword(s):  
Electromagnetic Interference ◽  
Transition Metal Dichalcogenides ◽  
Environmental Stability ◽  
Two Dimensional ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Two Dimensional Materials ◽  
Metal Dichalcogenides ◽  
Materials Used ◽  
The Impact

Commonly, metallic materials are used in practical ways to increase the shielding effectiveness (SE) through an appropriately designed assembly process. Unfortunately, the high density of devices that require it and the poor environmental stability of metals have impeded their massive use. In addition, for applications in the automotive, aerospace, and electronics industries, materials with light weight and good chemical stability are also required. The purpose of this chapter is to describe the impact that two-dimensional materials (or 2D materials) are having on the development of materials used for electromagnetic interference shielding, particularly the impulse of materials such as graphene, MXenes, transition metal dichalcogenides (TMDs), and phosphorene. The advances in the last decade are analyzed and alternatives are proposed that will come in the next decades. The shielding mechanisms presented by the two-dimensional materials are analyzed in detail and the specific applications in which these materials can be used are presented.

scholarly journals Spintronics in Two-Dimensional Materials

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yanping Liu ◽  
Cheng Zeng ◽  
Jiahong Zhong ◽  
Junnan Ding ◽  
Zhiming M. Wang ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
High Efficiency ◽  
2D Materials ◽  
Spin Injection ◽  
Transition Metal Dichalcogenides ◽  
Information Storage ◽  
Oxide Semiconductor ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Metal Dichalcogenides

AbstractSpintronics, exploiting the spin degree of electrons as the information vector, is an attractive field for implementing the beyond Complemetary metal-oxide-semiconductor (CMOS) devices. Recently, two-dimensional (2D) materials have been drawing tremendous attention in spintronics owing to their distinctive spin-dependent properties, such as the ultra-long spin relaxation time of graphene and the spin–valley locking of transition metal dichalcogenides. Moreover, the related heterostructures provide an unprecedented probability of combining the different characteristics via proximity effect, which could remedy the limitation of individual 2D materials. Hence, the proximity engineering has been growing extremely fast and has made significant achievements in the spin injection and manipulation. Nevertheless, there are still challenges toward practical application; for example, the mechanism of spin relaxation in 2D materials is unclear, and the high-efficiency spin gating is not yet achieved. In this review, we focus on 2D materials and related heterostructures to systematically summarize the progress of the spin injection, transport, manipulation, and application for information storage and processing. We also highlight the current challenges and future perspectives on the studies of spintronic devices based on 2D materials.

Morphology Optimization of Perovskite Films for Efficient Sky-Blue Light Emitting Diodes via a novel Green Anti-Solvent Dimethyl Carbonate

2021 ◽  
Author(s):  
Yong-Wen Zhang ◽  
Zheng-Liang Diao ◽  
Ji-Yang Chen ◽  
Wan-Yi Tan ◽  
Yannan Qian ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Blue Light ◽  
Radiative Recombination ◽  
Dimethyl Carbonate ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Two Dimensional ◽  
Light Emitting ◽  
Cascade Energy

Quasi-two-dimensional (quasi-2D) perovskites have been identified as promising emitters for high-efficiency blue PeLEDs, attributed to efficient radiative recombination resulted from the cascade energy transfer from low-n phases to high-n phases....

scholarly journals Recent Progress of Two-Dimensional Materials for Ultrafast Photonics

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1778
Author(s):  
Aojie Zhang ◽  
Zihao Wang ◽  
Hao Ouyang ◽  
Wenhao Lyu ◽  
Jingxuan Sun ◽  
...  
Keyword(s):  
Ultrafast Lasers ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Two Dimensional ◽  
Saturable Absorbers ◽  
Output Performance ◽  
Metal Dichalcogenides ◽  
Ultrafast Photonics ◽  
Physical And Chemical

Owing to their extraordinary physical and chemical properties, two-dimensional (2D) materials have aroused extensive attention and have been widely used in photonic and optoelectronic devices, catalytic reactions, and biomedicine. In particular, 2D materials possess a unique bandgap structure and nonlinear optical properties, which can be used as saturable absorbers in ultrafast lasers. Here, we mainly review the top-down and bottom-up methods for preparing 2D materials, such as graphene, topological insulators, transition metal dichalcogenides, black phosphorus, and MXenes. Then, we focus on the ultrafast applications of 2D materials at the typical operating wavelengths of 1, 1.5, 2, and 3 μm. The key parameters and output performance of ultrafast pulsed lasers based on 2D materials are discussed. Furthermore, an outlook regarding the fabrication methods and the development of 2D materials in ultrafast photonics is also presented.

scholarly journals Raman Characterization on Two-Dimensional Materials-Based Thermoelectricity

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 88 ◽  
Author(s):  
Zuoyuan Dong ◽  
Hejun Xu ◽  
Fang Liang ◽  
Chen Luo ◽  
Chaolun Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Raman Spectroscopy ◽  
2D Materials ◽  
Chemical Properties ◽  
Two Dimensional ◽  
Precise Control ◽  
Two Dimensional Materials ◽  
Physical And Chemical ◽  
Core Parameter ◽  
Raman Characterization

The emergence and development of two-dimensional (2D) materials has provided a new direction for enhancing the thermoelectric (TE) performance due to their unique structural, physical and chemical properties. However, the TE performance measurement of 2D materials is a long-standing challenge owing to the experimental difficulties of precise control in samples and high demand in apparatus. Until now, there is no universal methodology for measuring the dimensionless TE figure of merit (ZT) (the core parameter for evaluating TE performance) of 2D materials systematically in experiments. Raman spectroscopy, with its rapid and nondestructive properties for probing samples, is undoubtedly a powerful tool for characterizing 2D materials as it is known as a spectroscopic ‘Swiss-Army Knife’. Raman spectroscopy can be employed to measure the thermal conductivity of 2D materials and expected to be a systematic method in evaluating TE performance, boosting the development of thermoelectricity. In this review, thermoelectricity, 2D materials, and Raman techniques, as well as thermal conductivity measurements of 2D materials by Raman spectroscopy are introduced. The prospects of obtaining ZT and testing the TE performance of 2D materials by Raman spectroscopy in the future are also discussed.

scholarly journals Predicting two-dimensional topological phases in Janus materials by substitutional doping in transition metal dichalcogenide monolayers

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Aniceto B. Maghirang ◽  
Zhi-Quan Huang ◽  
Rovi Angelo B. Villaos ◽  
Chia-Hsiu Hsu ◽  
Liang-Ying Feng ◽  
...  
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Industrial Applications ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Substitutional Doping ◽  
Metal Dichalcogenides ◽  
Physical And Chemical

Abstract Ultrathin Janus two-dimensional (2D) materials are attracting intense interest currently. Substitutional doping of 2D transition metal dichalcogenides (TMDs) is of importance for tuning and possible enhancement of their electronic, physical and chemical properties toward industrial applications. Using systematic first-principles computations, we propose a class of Janus 2D materials based on the monolayers MX2 (M = V, Nb, Ta, Tc, or Re; X = S, Se, or Te) with halogen (F, Cl, Br, or I) or pnictogen (N, P, As, Sb, or Bi) substitution. Nontrivial phases are obtained on pnictogen substitution of group VB (V, Nb, or Ta), whereas for group VIIB (Tc or Re), the nontrivial phases are obtained for halogen substitution. Orbital analysis shows that the nontrivial phase is driven by the splitting of M-dyz and M-dxz orbitals. Our study demonstrates that the Janus 2D materials have the tunability and suitability for synthesis under various conditions.

scholarly journals Efficient Green Quasi-Two-Dimensional Perovskite Light-Emitting Diodes Based on Mix-Interlayer

2022 ◽  
Vol 9 ◽  
Author(s):  
Zirong Wang ◽  
Fanyuan Meng ◽  
Qi Feng ◽  
Shengxuan Shi ◽  
Langwen Qiu ◽  
...  
Keyword(s):  
Radiative Recombination ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Photophysical Properties ◽  
Device Performance ◽  
Two Dimensional ◽  
Obvious Effect ◽  
Light Emitting ◽  
Feasible Method ◽  
Maximum Current

Recently, quasi-two-dimensional (Q-2D) perovskites have received much attention due to their excellent photophysical properties. Phase compositions in Q-2D perovskites have obvious effect on the device performance. Here, efficient green perovskite light-emitting diodes (PeLEDs) were fabricated by employing o-fluorophenylethylammonium bromide (o-F-PEABr) and 2-aminoethanol hydrobromide (EOABr) as the mix-interlayer ligands. Phase compositions are rationally optimized through composition and interlayer engineering. Meanwhile, non-radiative recombination is greatly suppressed by the introduction of mix-interlayer ligands. Thus, green PeLEDs with a peak photoluminescence quantum yield (PLQY) of 81.4%, a narrow full width at half maximum (FWHM) of 19 nm, a maximum current efficiency (CE) of 27.7 cd/A, and a maximum external quantum efficiency (EQE) of 10.4% were realized. The results are expected to offer a feasible method to realize high-efficiency PeLEDs.

Sign in / Sign up

Export Citation Format

Share Document