Novel EGCG assisted combustion synthesis of Ce3+, Tb3+ co-doped Y4Al2O9 nanophosphors: Photometric characteristics, W-LED, anticounterfeiting and latent fingerprinting applications

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-01-22 DOI:10.1016/j.jlumin.2025.121093

K.S. Chenthil , Siva Ranganatham , B.R. Radha Krushna , M. Gagana , S.C. Sharma , Deepak Parhi , R. Sivayogana , R. Anitha , K. Manjunatha , Sheng Yun Wu , R. Arunakumar , H. Nagabhushana

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Abstract

This study reports the synthesis and characterization of novel green-emitting Y₄Al₂O₉:0.03Ce³⁺/0.02Tb³⁺ (YAM:0.03Ce³⁺/0.02Tb³⁺) nanophosphors (NPs) for advanced solid-state lighting and multifunctional applications. The NPs, synthesized using a combustion method, exhibited a monoclinic structure confirmed by Rietveld refinement using data. Upon near-ultraviolet (n-UV) excitation (365 nm), the YAM:0.03Ce³⁺/0.02 Tb³⁺ NPs produced bright green emission at 543 nm, facilitated by an efficient Ce³⁺→Tb³⁺ energy transfer (ET) process with a remarkable efficiency of 92.28 %. The ET mechanism is identified as dipole-dipole (d-d) interaction, highlighting the cooperative luminescent behavior between Ce³⁺ and Tb³⁺ ions. The NPs demonstrated excellent thermal stability, retaining 98.26 % of their luminescence at 423 K with an activation energy (E_a) of 0.38 eV, and a high internal quantum efficiency ("IQE") of 90.8 %. A prototype white light emitting diodes (w-LEDs), fabricated using the YAM:0.03Ce³⁺/0.02 Tb³⁺ NPs combined with a 395 nm n-UV LED chip and CaAlSiN₃:Eu²⁺ red NPs, exhibited superior performance. The device emitted high-brightness cool-white light with CIE coordinates (0.325, 0.319) and, a colour rendering index (R_a) of 94, a correlated colour temperature (CCT) of 5880 K, and a luminous efficacy (LE) of 35.02 lm/W. Beyond lighting applications, the NPs demonstrated high resolution and sensitivity in latent fingerprints (LFPs) detection, excellent fluorescence for anticounterfeiting applications, and strong potential for optical thermometry. The outstanding luminescent properties, thermal stability, and multifunctionality of YAM:0.03Ce³⁺/0.02 Tb³⁺ NPs underscore their potential as efficient colour converters for n-UV w-LEDs and versatile materials for security and forensic technologies, paving the way for advancements in solid-state lighting and beyond.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.