Multichannel Control of PersL/Upconversion/Down-Shifting Luminescence in a Single Core–Shell Nanoparticle for Information Encryption

Abstract

Persistent luminescence (PersL) has been attracting substantial attention in diverse frontier applications such as optical information security and in vivo bioimaging. However, most of the reported PersL emissions are based on the dopants instead of the host matrix, which also plays an important role. In addition, there are few works on the PersLbased multifunctional nanoplatform in nanosized materials. Here, we report a class of novel nanostructure designs with PersL, upconversion, and down-shifting luminescence to realize the fine-tuning of emission colors under different excitation modes including steady-state irradiation, time-gating, and PersL generation. Blue, orange, and green emissions were easily achieved in such a single nanoparticle under suitable excitation modes. Moreover, the physical origin of the PersL of the CaF 2 matrix was discussed by simulating the energy band structure with Ca x F y defects. Our results provide new opportunities for the design of a new class of multifunctional materials, showing great promise in the field of information encryption security and multilevel anticounterfeiting.

Pressure-Triggered Fluorescence Intensity Ratio Variations of YNbO4:Bi3+/Ln3+ (Ln = Eu or Sm) for High-Sensitivity Optical Pressure Sensing

“…6,8 Figure S2 and Figure 3c show the PL and PLE spectra of YNbO 4 :0.01Sm 3+ and YNbO 4 :0.01Eu 3+ and the PLE spectrum of YNbO 4 :0.01Bi 3+ , and the emission peaks were attributed on the basis of the literature. 18,20 One can see that the absorption bands of Sm 3+ and Eu 3+ overlap well with the emission bands of Bi 3+ . Thus, one can assume that energy transfer between Bi 3+ and Eu 3+ /Sm 3+ can occur.…”

Design of Cr–Ba-doped γ-Ga2O3 persistent luminescence nanoparticles for ratiometric temperature sensing and encryption information transfer

“…and is calculated with eqn (7) as 3.4% K À1 . 48 Relative sensitivity (S r ) is the relative signal change caused by a unit temperature change 46 and is calculated with eqn (8). The S r decreases with increasing temperature, indicating that the temperature probe is more sensitive at low temperatures with a 1.5% maximum at 300 K and a 0.543% minimum at 420 K (Fig.…”

“…[4][5][6] PLNPs constitute hosts, emission centers, and traps. 7 The hosts, such as aluminates, silicates, galliates, sulfides, fluorides, and germanates, 8 are the matrices to integrate the emission center and trap. 9 After the emission centers, including lanthanide, transition, and some main group elemental metal ions, 10 are introduced, the optical properties of the host were obviously improved for PLNPs, especially the near-infrared (NIR) emission.…”

Bionic Micro‐Texture Duplication and RE3+ Space‐Selective Doping of Unclonable Silica Nanocomposites for Multilevel Encryption and Intelligent Authentication

“…On the other hand, rare earth ions (RE 3+ ) have rich energy level structures and unique spectral characteristics, and their emission wavelengths can vary from ultraviolet to infrared, which are often used as emission centers in fluorescent materials. [58][59][60][61][62] Based on porous structured glasses and different RE 3+ doping, multicolor fluorescent glasses can be constructed by the control of the fluorescent color and position. [63] Generally, RE 3+ doped glasses are transparent and non-fluorescent under natural light, while characteristic fluorescence emissions appear under the excitation of specific light, thus providing a valuable reference for information encryption in glass.…”