Regulation of Intrinsic Defects of Self‐Activated MgGa2O4 Phosphors for Temperature Dynamic Anti‐Counterfeiting

Author:

Wang Guohao1,Wang Ting12ORCID,Yue Yang3,Hou Lihui1,Huang Wenlong1,Zhu Xuanyu1,Liu Haozhe1,Yu Xue3ORCID

Affiliation:

1. College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu 610059 China

2. Guangdong Provincial Key Labratory of Semiconductor Optoelectronic Materials and Itelligent Photonic Systems Harbin Institute of Technology Shenzhen 518071 China

3. School of Mechanical Engineering Institute for Advanced Materials Chengdu University Chengdu 610106 China

Abstract

AbstractPhotoluminescent (PL) anti‐counterfeiting plays a critical role in encrypted information and anti‐counterfeiting. Dynamic PL anti‐counterfeiting technology provides advanced security features compared with static counterparts. Yet, many current dynamic luminescent materials rely solely on an optical storage mechanism, leading to a lack of diversification and making them vulnerable to replication. Here, dynamic PL emission triggered by ambient temperature variations is addressed. By modifying the sintering atmospheres and non‐stoichiometric ratio of MgGa2O4 (MGO) samples, the concentration of intrinsic defects of the host are modified, resulting in temperature‐sensitive PL output dynamically manipulated from blue to green to red. Density‐functional theory (DFT) analysis elucidates the formation energies of intrinsic defects in the MGO samples, revealing that the self‐activated blue, green, and red emissions stem from lattice defects, [GaO6], antisite defects , and interstitial oxygen (), respectively. Additionally, by monitoring the luminescence lifetime, and the thermoluminescence (TL) curves of the MGO samples, it is shown that the dynamic PL emission is generated by a combination of thermally assisted carrier migration and thermal compensation from trapping centers. Herein, a dual‐channel encrypted dot matrix is designed to enhance information transfer security through the interference between the dual channels, showcasing the practical application of this dynamic anti‐counterfeiting technique.

Funder

National Defense Science and Technology Innovation Fund of the Chinese Academy of Sciences

Young Elite Scientists Sponsorship Program by Tianjin

Publisher

Wiley

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