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The role of chelating agent on the structure and up-conversion property of NaLuF4:Yb,Tm as security ink phosphor

Saeed Bastani (Department of Surface Coating and Corrosion, Institute for Color Science and Technology, Tehran, Iran and Department of Printing Science and Technology, Institute for Color Science and Technology, Tehran, Iran)
Mojtaba Jalili (Department of Printing Science and Technology, Institute for Color Science and Technology, Tehran, Iran)
Mehdi Ghahari (Department of Nanomaterials and Nanocoatings, Institute for Color Science and Technology, Tehran, Iran)
Parand Banihashem (Department of Printing Science and Technology, Institute for Color Science and Technology, Tehran, Iran)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 23 March 2022

Issue publication date: 28 July 2023

98

Abstract

Purpose

This study aims to investigate the effect of trisodium nitrilotriacetic acid (NTA) on the physical and luminescence emission properties of NaLuF4:Yb, Tm Upconversion (UC) particles and compared with trisodium citrate (CA). Upconversion materials have been remarkably considered in many applications in the past decades. However, the morphology of the UC particles affects their emission properties, depending on the synthesis situation.

Design/methodology/approach

The UC particles were synthesized by the hydrothermal method. Properties such as crystal phase, particle morphology, particle size, smoothness and uniformity of particle surface and their emission intensity in the UV–Vis region were studied.

Findings

Observations showed that pH is an essential factor in determining the crystalline phase. In addition, quality factors affect the morphology, particle size and surface smoothness of crystalline facets. It was also found that the UC particles synthesized in the presence of trisodium NTA have a much higher emission intensity than those synthesized in the presence of CA. The use of UC particles in security inks to maintain the brand was also investigated.

Originality/value

To the best of the authors’ knowledge, for the first time, the effect of trisodium NTA as a chelating agent was investigated on morphology and UC intensity of NaLuF4:Yb,Tm phosphor.

Keywords

Acknowledgements

Conflict of interest: The authors declare that they have no conflict of interest. This research did not receive any specific funding.

Citation

Bastani, S., Jalili, M., Ghahari, M. and Banihashem, P. (2023), "The role of chelating agent on the structure and up-conversion property of NaLuF4:Yb,Tm as security ink phosphor", Pigment & Resin Technology, Vol. 52 No. 5, pp. 545-551. https://doi.org/10.1108/PRT-12-2021-0147

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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