Visible-to-Near-Infrared Mechanoluminescence in Bi-Activated Spinel Compounds for Multiple Information Anticounterfeiting

• DOI: 10.1021/acsami.4c04499
• Publication Date: 2024-06-27T20:26:30Z
• Authors: Zhicong Chen; Peishan Shao; Puxian Xiong; Yao Xiao; Bingjun Liu; Zhiduo Wang; Sheng Wu; Dongliang Jiang; Kang Chen; Jiulin Gan; Dongdan Chen; Zhongmin Yang
• Keywords: Mechanoluminescence

Mechanoluminescence (ML) is the nonthermal luminescence generated in process of force-to-light conversion, which has broad prospects stress sensing, wearable devices, biomechanics, and multiple information anticounterfeiting. Multivalence emitter ions utilize their own self-reduction to realize multiband ML without introducing another dopant, such as Eu3+/Eu2+, Sm3+/Sm2+, Mn4+/Mn2+. However, self-reduction-induced bismuth-activated materials rarely been reported so far. In this work, a novel visible-to-near-infrared (vis-NIR) induced by Bi3+ Bi2+ spinel-type compound (MgGa2O4) reported. The photoluminescence (PL) spectra, PL excitation (PLE) lifetime curves demonstrate that Bi3+/Bi2+ are main centers. Notably, possible model proposed, where magnesium vacancy (VMg″) considered driving force for Bi2+. Furthermore, an oxygen (VO••) confirmed electron paramagnetic resonance (EPR) spectroscopy. Combined with thermoluminescence (TL) glow plausible trap-controlled mechanism illustrated, electron-hole (VO••/VMg″) pairs play significant role capturing electrons holes. It worth noting proof-of-concept dual-mode electronic signature application implemented based on flexible film, improves capabilities anticounterfeiting high-level security applications. Besides, multistimulus-responsive behaviors film realized under 254 nm UV lamp, thermal disturbance, 980 laser, mechanical stimuli. general, study provides new insights into designing vis-NIR toward wider possibilities.