Recent Advances in 2D Rare Earth Materials

Abstract

2D rare earth (RE) materials have received considerable attention in recent years due to the fascinating luminescence, magnetism, and electric properties originated from RE associated with sharp and various emission peaks, intrinsic 2D ferromagnetism, and incommensurate charge density wave. These materials might open up a new prospect in next‐generation lighting, magnetic devices, and phototransistors. Herein, a comprehensive review of 2D RE materials is presented, focusing on their recent progresses. First, the crystal structures of 2D RE materials are discussed. Then, typical synthesis methods such as mechanical exfoliation, molecular beam epitaxy, pulsed laser deposition, and chemical vapor deposition are introduced. Furthermore, various properties in luminescence, magnetism, and electronics are summarized. The recently reported RE‐based 2D novel photodetectors are outlined as three constructions: MoS2/RE, graphene/RE, and perovskite/RE, which show promising applications for both narrow and broad band detection arised from the special absorption windows of different RE elements. Finally, the conclusions and outlook of this area are proposed, such as exploring novel 2D RE compounds, improving stability, and broadening applications.

2D Van der Waals Rare Earth Material Based Ratiometric Luminescence Thermography Integrated on Micro–Nano Devices Vertically

“…Er 3+ ions are excellent luminescent centers for achieving emissions from visible to infrared range. [15,21] As shown in Figure 1h, photoluminescence (PL) properties of Er 3+ ions in 2D ErOCl were conducted. Under 532 nm excitation, sharp and strong emissions from 650 to 675 nm were detected, which originate from the transition of 4 F 9/2 − 4 I 15/2 .…”

“…[4,12,13] However, these lumines cent semiconductor films cannot achieve vertical integration and will incur interfer ence on the performance of chips due to the semiconductor nature.2D insulated van der Waals (vdW) rare earth (RE) materials have both the layered structure and intriguing temperature dependent luminescence properties. [14,15] 2D vdW RE materials have no dangling bonds and large spe cific surface area, which can be beneficial for achieving a better thermal contact with the target and high sensitivity. [16,17] With layered structure and insulated properties, 2D vdW RE mate rials can be easily integrated on semiconductor chips vertically without dangling bonds, so that a highdensity integration can be realized.…”

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

“…RE elements are the collective name of 17 special elements, containing 15 lanthanide (Ln) elements as well as yttrium (Y) and scandium (Sc) elements [9] . Different from the transition metal elements, RE elements have unique ground‐state electronic configurations, and their unpaired 4 f orbital electrons endow RE elements with many excellent properties, such as optical, magnetic, and electrical properties [10] . Furthermore, RE elements have large ion radius, low electronegativity, and high affinity for oxygen, and most of them have either RE 3+ /RE 2+ or RE 4+ /RE 3+ redox couples, acting as the redox‐active component during electrochemical process [11,12] .…”

Programmable Polarization of 2D Anisotropic Rare Earth Material for Images Transmission and Encryption

“…Recently, 2D rare earth (RE) materials have shown great potential in optoelectronics due to the unique optical behaviors of RE ions. [ 14–16 ] The emission of RE ions ranges from ultraviolet to infrared, which is beneficial for 2D RE materials to achieve light modulation over a wide range. [ 17,18 ] Multiple emission peaks of RE ions can endow 2D RE materials with multimode regulation of light.…”