Achieving multiple emission states and controllable response behaviour in thermochromic luminescent materials for security applications

2020 ◽  
Vol 8 (31) ◽  
pp. 10798-10804 ◽  
Author(s):  
Suyi Liu ◽  
Yun Ma ◽  
Shujuan Liu ◽  
Kexin Chen ◽  
Wei Huang ◽  
...  
Keyword(s):  
Information Storage ◽  
Security Level ◽  
Luminescent Materials ◽  
Transition Temperatures ◽  
Security Applications ◽  
Response Behaviour ◽  
High Security ◽  
Level Information ◽  
High Security Level ◽  
Thermochromic Transition

In this work, thermochromic luminescent materials with three emission states and controllable thermochromic transition temperatures were developed for multilevel anti-counterfeiting and high-security level information storage.

scholarly journals Long-Lasting ZnO-P2O5-SiO2:Mn2+ Glass for Optical Information Storage

2021 ◽  
Author(s):  
Tao Zheng ◽  
Haoran Xu ◽  
Xiangfu Wang ◽  
Xiaohong Yan
Keyword(s):  
Information Storage ◽  
Infrared Light ◽  
Luminescence Spectra ◽  
Security Level ◽  
Optical Information ◽  
Coordination Environment ◽  
High Security Level ◽  
Light Excitation ◽  
Optical Information Storage ◽  
Red Luminescence

Abstract The optical information storage ZnO-P2O5-SiO2:Mn2+ glass was prepared by the melting method. The photoluminescence (PL), long persistence luminescence (LPL) and photo-stimulated luminescence (PSL) show the same luminescence spectra with main peaks located at 607 nm. The research shows that the color of luminescence depends on the coordination environment of Mn2+ in the crystal lattice and the red luminescence depends on the 4T1(4G)→6A1g(6S) electronic transition of Mn2+. PSL and LPL phenomenon can’t be observed in 70ZnO-10P2O5-20SiO2 glass, which indicates that Mn2+ ions serve as glowing centers in PSL and LPL phenomenon. Thermo-luminescence (TL) shows that the depth of the traps in glass is as high as 0.908eV. The 254 nm ultraviolet light was used to record information in the glass and read it under 980 nm infrared light excitation. The ZnO-P2O5-SiO2:Mn2+ glass in this work is a high-security level optical information storage medium.

Optical Nanomaterials and Enabling Technologies for High‐Security‐Level Anticounterfeiting

2019 ◽  
Vol 32 (18) ◽  
pp. 1901430 ◽  
Author(s):  
Wei Ren ◽  
Gungun Lin ◽  
Christian Clarke ◽  
Jiajia Zhou ◽  
Dayong Jin
Keyword(s):  
Security Level ◽  
Enabling Technologies ◽  
High Security ◽  
High Security Level ◽  
Optical Nanomaterials

scholarly journals A Novel Technique for Data Steganography

2019 ◽  
Vol 9 (6) ◽  
pp. 4942-4945
Author(s):  
A. Y. Hindi ◽  
M. O. Dwairi ◽  
Z. A. AlQadi
Keyword(s):  
Color Image ◽  
Secret Message ◽  
Security Level ◽  
Novel Technique ◽  
High Security ◽  
High Security Level

In this paper, a novel stego-method will be introduced, which can be used to hide any secret message in any holding color image. The proposed method will be implemented and tested and the calculated parameters will be compared with the LSB method parameters. It will be shown that the proposed method provides a high-security level by using two keys to extract the secret message from the holding image, making it very difficult to hack.

scholarly journals GIS analysis of promising landing sites for manned flight to Mars

2019 ◽  
Vol 138 ◽  
pp. 02004 ◽  
Author(s):  
Marina Kuziakina ◽  
Dmitry Gura ◽  
Dmitry Zverok
Keyword(s):  
Remote Sensing ◽  
General Public ◽  
Security Level ◽  
Gis Analysis ◽  
High Security ◽  
Landing Sites ◽  
Manned Flight ◽  
High Security Level ◽  
Scientific Value ◽  
Remote Sensing Methods

Remote sensing provides data that can be used in a variety of projects. One such project is the preparation for sending a manned flight to Mars. Before the departure of the expedition it is very important to carefully select a place of high scientific value and a high security level for the members of the flight. Remote sensing methods allow getting the whole set of necessary data, which will later be used for the flight equipment properly, as well as to adapt the lander design. Currently, robotic probes that send the collected information to Earth are engaged in the collection of the necessary data. There, the data, in turn, can be processed by specialists, as well as provided for the general public for informational purposes only.

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