A novel Er3+ activated Y4Al2O9 nanophosphors with high thermal stability for applications in w-LEDs and latent fingerprints detection

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-03-27 DOI:10.1016/j.jlumin.2025.121215

R. Arunakumar , B.R. Radha Krushna , G.R. Mamatha , S.C. Sharma , B. Bommalingaiah , Pusparaj Samantsinghar , Jaiganesh Inbanathan , C.T. Meyyammai , G. Ramakrishna , K. Manjunatha , Sheng Yun Wu , H. Nagabhushana

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Abstract

A series of un-doped and 1–9 mol % Er³⁺ doped Y₄Al₂O₉ nanophosphors (YAO:Er³⁺ NPs) are synthesized through a urea-assisted combustion process. X-ray diffraction (XRD) analysis confirmed the monoclinic structure for both types, while scanning electron microscopy revealed their irregular morphology. The YAO:Er³⁺ NPs exhibited an excitation peak at 380 nm, closely matching the near-ultraviolet (n-UV) chip. When excited by n-UV light, these NPs produced a narrow-band green emission with a dominant peak at 549 nm. The optimal Er³⁺ doping concentration in YAO is identified as 5 mol %. Additionally, YAO:5Er³⁺ NPs demonstrated a color purity (CP) of 87.4 % and a thermal stability of 91.3 % at 423 K (T_0.5>473 K). The temperature-dependent photoluminescence (TDPL) emission spectra are recorded in the range of 323–473 K, and the fluorescence intensity ratio (FIR) technique is employed to evaluate the optical temperature sensing capabilities of YAO:5Er³⁺ NPs. The maximum absolute sensitivity (S_a) and relative sensitivity (Sᵣ) are found to be 38 × 10⁻³ K⁻¹ and 1.33 % K⁻¹. The internal quantum efficiency (I_QE) of the YAO:5Er³⁺ NPs sample is found to be 83.3 %. The fabricated white light-emitting diodes (w-LEDs) demonstrates CIE coordinates of (0.3635, 0.3557), a high color rendering index (CRI) of R_a = 94, and a correlated color temperature (CCT) of 4361 K, achieved by incorporating the optimized YAO:5Er³⁺ green phosphor into w-LED devices. Furthermore, these NPs enhance the visualization of ridge patterns, minutiae points, and pore structures in latent fingerprints (LFPs), improving clarity for high-resolution forensic analysis. This study also explores YOLOv8x, an advanced object detection model, for LFPs analysis. Its state-of-the-art architecture enables fast, precise identification of key features, enhancing forensic investigations and biometric authentication. Experimental results show that YOLOv8x surpasses conventional methods in accuracy and speed, highlighting its superiority in fingerprint analysis. In conclusion, the YAO:Er³⁺ phosphors show great potential for applications in forensic analysis, optical temperature sensing, and w-LEDs.

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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.