Enhance photoluminescence properties of Ca-Eu:Y2O3@SiO2 core-shell nanomaterial for the advanced forensic and LEDs applications

Arpita Dwivedi; Anuradha; Monika Srivastava; Amit Srivastava; Rajneesh Kumar; Sanjay Kumar Srivastava

doi:10.1016/j.saa.2023.122782

Enhance photoluminescence properties of Ca-Eu:Y₂O₃@SiO₂ core-shell nanomaterial for the advanced forensic and LEDs applications

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Oct 15:299:122782. doi: 10.1016/j.saa.2023.122782. Epub 2023 May 13.

Authors

Arpita Dwivedi¹, Anuradha², Monika Srivastava³, Amit Srivastava⁴, Rajneesh Kumar², Sanjay Kumar Srivastava⁵

Affiliations

¹ Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India. Electronic address: joinarpit@gmail.com.
² Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
³ School of Materials Science and Technology, IIT (BHU), Varanasi 221005, India.
⁴ Department of Physics TDPG College, VBS Purvanchal University, Jaunpur 222001, India.
⁵ Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India. Electronic address: Sanjay_itbhu@yahoo.com.

PMID: 37209471
DOI: 10.1016/j.saa.2023.122782

Abstract

The divalent (Ca²⁺)-doped Eu:Y₂O₃@SiO₂ core-shell luminescent nanophosphors have been synthesised by a cost-effective combustion technique. Various characterizations were carried out to confirm the successful formation of the core-shell structure. The TEM micrograph reveals the thickness of the SiO₂ coating over Ca-Eu:Y₂O₃ as ∼25 nm. The optimal value of silica coating over the phosphor has been obtained as 10 vol%(TEOS) of SiO₂, with this value increasing fluorescence intensity by 34 %. Phosphor exhibits CIE coordinates as x = 0.425, y = 0.569 and a CCT value as ∼2115 K with color purity and the respective CRI of 80 % and 98 %, respectively, which make the core-shell nanophosphor suitable for warm LEDs, and other optoelectronic applications. Further, the core-shell nanophosphor has been investigated for the visualisation of latent finger prints and as security ink. The findings point towards the prospective future application of nanophosphor materials for anti-counterfeiting purposes and latent finger prints for forensic purposes.

Keywords: Anti-counterfeiting ink; Ca(2+)-Eu:Y(2)O(3)@SiO(2) core–shell nanomaterial; Latent fingerprint; Photoluminescence; Silica template.