Revathy, J S and Abraham, Malini and Jagannath, G and Rajendran, Deepthi N and Das, Subrata (2023) Microwave-assisted synthesis of GdOF: Eu3+/Tb3+ ultrafine phosphor powders suitable for advanced forensic and security ink applications. Journal of Colloid and Interface Science, 641. pp. 1014-1032. ISSN 0021-9797

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Abstract

The rare-earth-doped inorganic ultrafine oxyfluoride host matrices in forensic science, especially in latent fingerprint detection and anti-counterfeiting applications, were still unexplored and may replace the existing technology owing to its high sensitivity. Herein, GdOF: Eu3(+)/Tb3+ ultrafine red and green phosphors were synthesized via a rapid, green microwave-assisted hydrothermal method at 150 circle C. The phosphors synthesized by this novel method possess good luminescent intensity for the hypersensitive D-5(0)-> F-7(2) transition of Eu3+ and D-5(4)-> F-7(5) transition of Tb3+ ions as compared to the phosphors prepared via other conventional methods such as co-precipitation synthesis, sol-gel synthesis, and microwave-assisted co-precipitation synthesis. Further, an enhancement in the luminescent intensity of the ultrafine phosphor was noticed when the microwave parameters and pH values were tuned. The optimized red and green phosphors having high luminescence intensity, good color purity, and high quantum yields of 89.3%, and 71.2%, respectively, were used for the visualization of latent fingerprints on various substrates. These promising phosphors exhibited excellent visualization regardless of the background interference and limit the risk of duplication and are highly reliable. The security inks developed using these phosphors are highly efficient for anti-counterfeiting applications. These multifunctional properties of investigated phosphors can be explored for security applications. (c) 2023 Elsevier Inc. All rights reserved.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	06 Oct 2023 12:21
Last Modified:	06 Oct 2023 12:21
URI:	http://cgcri.csircentral.net/id/eprint/5578

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