Design of Ratiometric Dual‐Emitting Mechanoluminescence: Lanthanide/Transition‐Metal Combination Strategy

Abstract

Mechanoluminescence (ML) materials with the ability to convert mechanical stimulate into visible light signals have enabled visualized mechanics sensing. To this point, stress sensing based on ML color is preferred over that based on ML intensity in terms of both sensing reliability and visual sensitivity. In this work, a ratiometric dual‐emitting ML strategy to realize the stress‐sensitive ML color variation, where the Lanthanide/transition‐metal combination is adopted to build the dual‐activator ML system is proposed. The difference in electronic configuration between Lanthanide and transition‐metal ions leads to the significant discrepancy in the response of corresponding luminescence kinetics to the instantaneous change of local crystal field environment induced by stress, which plays a key role in the strategy. This strategy establishes a new general path for the design of novel ratiometric ML materials.

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.…”

Designing stimuli-responsive and color-tunable indicators via the coexistence of dual emitting centers

“…[1][2][3][4][5][6] Among these applications, luminescent materials as smart platforms featuring multicolor and stimuli-responsiveness properties have shown great promise in advanced and high-level information security. [7][8][9][10][11][12] Careful selection of different phosphors and a combination of various emission wavelengths is a popular method to obtain color-tunable indicators. Furthermore, multicolor emissions from a single host matrix doped with rare earth ions would be a more suitable approach due to the stable and consistent chemical and physical properties.…”

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

“…Based on the different response of luminescence dynamics of activators to the stress‐induced change in local crystal field strength, very recently, our group proposed a ratiometric dual‐activator ML strategy to realize the stress‐sensitive color variation. [ 6 ] In addition to local crystal field strength, actually, local site symmetry of the luminescence centers can be changed instantaneously by stress as well. Local site symmetry is supposed to significantly influence the spectrum profile of lanthanide ions (Ln 3+ ) due to the fact that the selection rules for electronic transitions of Ln 3+ in solid are closely related to the corresponding site symmetry.…”