Red-emitting LiAlSiO4:Eu3+ nanophosphors: A versatile material for lighting, forensic and anti-counterfeiting technologies

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-04-09 DOI:10.1016/j.jlumin.2025.121240

T.N. Megharaj , B.R. Radha Krushna , G.R. Mamatha , B. Bommalingaiah , S.C. Sharma , Subhashree Ray , V.J. Subha , Augustine George , K. Manjunatha , Sheng Yun Wu , R. Arunakumar , G. Ramakrishna , H. Nagabhushana

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引用次数: 0

Abstract

High-performance red-emitting LiAlSiO₄:Eu³⁺ (0–11 mol%) nanophosphors (LASO:Eu³⁺ NPs) are successfully synthesized via an eco-friendly, low-temperature solution combustion method, employing mushroom extract as a green fuel for the first time. These NPs are developed for applications in white light-emitting diodes (w-LEDs) and latent fingerprints (LFPs) visualization. Under 393 nm excitation (⁷F₀ → ⁵L₆ transition), LASO:Eu³⁺ NPs exhibit a prominent emission peak at 616 nm, corresponding to the ⁵D₀ → ⁷F₂ transition. The optimal doping concentration is determined to be 7 mol%, with concentration quenching primarily influenced by neighbouring ion interactions. The Commission Internationale de l’Éclairage (CIE) chromaticity coordinates of LASO:7Eu³⁺ NPs are determined to be (0.616, 0.377), with a color purity (CP) of 98.3 % and an average correlated color temperature (CCT) of 1832 K. Furthermore, the phosphors are evaluated for temperature-sensing capabilities based on the fluorescence intensity ratio (FIR) technique. The phosphor retains ∼86.10 % PL intensity at 423 K and exhibits internal quantum yield (I_QE) of 65.20 %. Relative sensitivity is assessed using two different peak ratios, yielding maximum values at 303 K of 0.45 % K⁻¹ for I₅₃₇/I₅₉₂ and 1.04 % K⁻¹ for I₅₃₇/I₆₁₆. The suitability of the phosphor for the powder dusting method in fingerprints (FPs) detection on various surfaces is also assessed. Under 365 nm UV light, the LASO:7Eu³⁺ NPs clearly reveals the level I–III features of LFPs. A new anti-counterfeiting (AC) material utilizing LASO:7Eu³⁺ phosphor has been developed, showcasing intense red luminescence under UV light and offering distinctive optical features for secure and dependable authentication in advanced security systems. Overall, LASO:7Eu³⁺ NPs showing excellent red emission, thermal stability, and quantum efficiency. Their multifunctionality makes them promising candidates for w-LEDs, optical thermometry, and high-resolution LFPs detection.

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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.