☆ 4.6 Article

Phase and photoluminescence analysis of dual-color emissive Eu3+-doped ZrO2 nanoparticles for advanced security features in anti-counterfeiting

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2021)

Journal

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

Volume 631, Issue -, Pages -

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ELSEVIER

DOI: 10.1016/j.colsurfa.2021.127715

Keywords

asymmetric ratio; Eu3+-doped zirconia; tetragonal; monoclinic; Photoluminescence; dual-color

Funding

Nano Mission, Department of Science and Technology [SR/NM/NS-1382/2014]

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Abstract

In this study, low concentration dual-color emissive Eu3+-doped ZrO2 nanoparticles were developed via precipitation method. Different phases of Eu3+-doped zirconia phosphors were found to induce variation in photoluminescence characteristics, affecting the color emission and asymmetric ratio. This research provides insights into the potential use of these materials for advanced security in anti-counterfeiting applications.

In the present work, lower concentration-based dual-color emissive Eu3+-doped ZrO2 loose nanosized particles have been developed via precipitation method with sodium borohydride for the potential use of advanced security in anti-counterfeiting application. Stabilization of tetragonal zirconia up to moderate temperature has been explored considering lower Eu3+-concentration, particle size, and strain. Different phases of Eu3+-doped zirconia phosphors induce variation in photoluminescence characteristics such as photoluminescence emission, asymmetric ratio i.e. intensity of red to orange emission ratio, Commission International de I'Eclairage i.e. CIE chromaticity coordinates, and color emission. Also, phases of Eu3+-doped zirconia may produce multi-color emission, including white light depending on Eu3+-concentration, calcination temperature, and excitation wavelength. Photoluminescence emission spectra have been investigated at the excitation wavelengths of 254 nm, 365 nm, 393 nm, and 463 nm. Change in the peak position of the transition 5D0 -> 7F2 and 5D0 -> 7F1 in emission spectra indicates the presence of either mixed-phase or tetragonal zirconia polycrystals in Eu3+-doped zirconia samples. It was mainly due to the unlike site symmetry position of Eu3+-ions in different phases of Eu3+doped zirconia. The intensity variation of the transitions in different phases of Eu3+-doped zirconia affects the asymmetric ratio, and thus produces shades of dual color emission, including near-white. In addition, the dualcolor emissive sample, i.e., 0.5 mol% Eu3+-doped ZrO2 nanopowders, has been explored for anti-counterfeiting applications using a standard screen-printing technique.

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Thermophysical and mechanical properties of cubic, tetragonal and monoclinic ZrO2

Xuemei Song, Yi Ding, Jimei Zhang, Caifen Jiang, Ziwei Liu, Chucheng Lin, Wei Zheng, Yi Zeng

Summary: This study investigates the effect of phase composition and microstructure on the thermophysical and mechanical properties of Yttrium-stabilized zirconia (YSZ) materials. The results show that YSZ materials with cubic (c-YSZ) phase are more suitable as thermal barrier coatings (TBCs) due to their superior heat insulation, thermal expansion match, and strain tolerance. The c-YSZ phase also has lower thermal conductivity and greater lattice distortion, oxygen vacancies, and sound velocity due to Y2O3 doping. Additionally, the c-YSZ phase exhibits lower elastic modulus, better malleability and plasticity, while the tetragonal (t-YSZ) phase has better fracture toughness.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2023)