Two-dimensional (2D) materials have garnered considerable attention due to their advantageous properties, including tunable bandgap, prominent carrier mobility, tunable response and absorption spectral band, and so forth. The above-mentioned properties ensure that 2D materials hold great promise for various high-performance infrared (IR) applications, such as night vision, remote sensing, surveillance, target acquisition, optical communication, etc. Thus, it is of great significance to acquire better insight into IR applications based on 2D materials. In this review, we summarize the recent progress of 2D materials in IR light emission device applications. First, we introduce the background and motivation of the review, then the 2D materials suitable for IR light emission are presented, followed by a comprehensive review of 2D-material-based spontaneous emission and laser applications. Finally, further development directions and challenges are summarized. We believe that milestone investigations of 2D-material-based IR light emission applications will emerge soon, which are beneficial for 2D-material-based nano-device commercialization.

Selective catalytic reduction (SCR) and denitrification are the best technologies for nitrogen oxides (NO_x) control in coal-fired power plants, and their denitration efficiency and ammonia escape rate are closely related to their internal flow characteristics. By adding a deflector to the SCR device, the flow field in the curve can be effectively improved, and the stable and efficient operation of the SCR device can be realized. Based on the numerical simulation method, the SCR system of a coking coal-fired boiler in a steel plant was simulated using k-ε (the turbulence model), and three design schemes of deflectors were proposed and numerically simulated simultaneously. After optimization, the ammonia injection grid’s downstream velocity variance coefficient C_V was 6.69, the catalyst upper cross-section velocity variance coefficient was 11.84, the cross-sectional temperature average was 499 K, the maximum temperature deviation was 9 °C, the maximum-to-minimum temperature interval span was 15 °C, the cross-sectional NH₃/NOx molar ratio average value was 0.8122, the coefficient of variance was 4.67, and the pressure loss was 1855 Pa. The findings of this work will help improve the denitration efficiency and provide an important reference for the actual transformation design.

To characterize the laser-driven shock wave propagation process in anthracene molecules, the time-resolved Raman spectroscopy experiments were performed. After establishing a pressure distribution formula and using Lorenz profile to simulate the experimental Raman spectrum, the pressure distribution in the gauge layer during the pressure loading and unloading processes will be clarified in real time. The velocity of shock wave in the gauge layer, calculated through the shock front location at various delay time, is about 2.99 km s ⁻¹ . Noticing that the relative intensity of compressed Raman mode is proportional to the velocity of the shock wave, in this work, this relationship was identified in a new mathematical expression after establishing a physical model. The velocity of shock wave calculated from the new formula is about 3.02 km s ⁻¹ , which was in great agreement with the previous method and both methods are corresponded to practice.

Selective excitation of C–H, C–C, CX¹ and CX² modes in an orderly manner, detection of intramolecular energy redistribution in aryl halides are performed by time- and frequency-resolved Coherent Anti-Stokes Raman Scattering (CARS) spectroscopy.