Stress Sensing by Ratiometric Mechanoluminescence: A Strategy Based on Structural Probe

Abstract

Featured with specific relationship between luminescence intensity and stress, mechanoluminescence (ML) has shown great application potential in stress sensing. However, the uncertainty in acquisition of absolute ML intensity may cause significant error in ML‐intensity‐based stress sensing. A ratiometric ML scheme has been recently proposed as an alternative solution to circumvent such problem. In this paper, a novel strategy based on a lanthanide structural probe is demonstrated to realize the ratiometric ML for stress sensing, where the stress‐induced change in local site symmetry leads to the establishment of the relationship between the ML asymmetry ratio of the structural probe and the applied stress. This strategy offers a brand‐new design solution toward ratiometric ML aiming at improving the reliability of stress sensing.

Stress‐Triggered Mechanoluminescence in ZnO‐Based Heterojunction for Flexible and Stretchable Mechano‐Optics

“…By adding ZnO with a luminescent Mn 2+ center, the ZnF 2 /ZnO heterojunction emits a reddish-yellow ML upon dynamic excitation by an external stress. This can be attributed to the 4 T 1 (4G) → 6 A 1 (6S) transition of the optically active Mn 2+ center. In addition, the ML intensity from Mn 2+ increases linearly as the external force increases gradually.…”

“…[3] As an important smart material, mechanoluminescent crystals are a promising option in many areas, including multisensing, advanced lighting, environmentally friendly displays, sports science, and novel lowcarbon energy. [4][5][6][7][8][9][10] Compared with other energy-to-light conversion strategies, such as electroluminescence, photoluminescence (PL), and persistent luminescence, mechanoluminescence (ML) offers the significant advantage of converting waste into luminescence, which is particularly beneficial in the current global energy crisis. [11,12] ML is a light phenomenon whereby ML materials can convert external mechanical stimuli, including hits, bends, squeezes, impacts, sweeps, stretches, wind, and raindrops, into luminescence.…”

Eu3+‐Activated Single‐Band Ratiometric Nanothermometry by Lattice Negative Thermal Expansion

“…The domination of electricdipole 5 D 0 → 7 F 2 over magnetic-dipole 5 D 0 → 7 F 1 transition revealed the non-inversion symmetric environment around Eu 3+ center in the lattice. [26,27] Notably, a rapid increase in the photoluminescence (PL) emission was observed as rising dopant content from 1% to 30%, without occurring concentration quenching ef-fect (Inset of Figure 3b). This phenomenon may resulted from the relatively long distance between nearest-neighbor Sc 3+ ions (≈6.127 Å) in Sc 2 Mo 3 O 12 crystal that favors the heavy doping of Eu 3+ ions.…”

High charge carrier storage capacity and wide range X-rays to infrared photon sensing in LiLuGeO4:Bi3+,Ln3+ (Ln = Pr, Tb, or Dy) for anti-counterfeiting and information storage applications

“…[1][2][3][4][5] The stored charge carriers can later be excited to yield rapid photon emission by thermal, 6,7 optical, 8,9 or mechanical stimulation. [10][11][12] Because of this feature, storage phosphors have many promising applications in X-ray computed tomography (CT), 13 dosimeters for radiation detection, [14][15][16] information storage, 17,18 anti-counterfeiting, 19 and even exploring mechanoluminescence materials for smart compression force sensing. 12,[20][21][22] There is a request to develop new afterglow and storage phosphors for exploring new applications such as advanced anti-counterfeiting and information storage.…”