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<p>A series of deep reddish - orange emitting Sm<sup>3+</sup> - activated Ca<sub>8</sub>ZnGd(VO<sub>4</sub>)<sub>7</sub> nanophosphors has been successfully produced using the solution combustion technique. Through X-ray diffraction patterns (XRD), the structural properties of the produced nanomaterials are examined. Crystallisation in the trigonal lattice with space group as R3c (161) is confirmed by the Rietveld refinement technique. The morphological and elemental characteristics of the nanomaterials have been thoroughly characterised using SEM, TEM (scanning and transmission electron microscope) and EDAX (energy dispersive X-ray analysis). The Ca<sub>8</sub>ZnGd<sub>1 − <i>x</i></sub>(VO<sub>4</sub>)<sub>7</sub>:<i>x</i>Sm<sup>3+</sup> (<i>x</i> = 5&#xa0;mol %) samples exhibited a noticeable emission peak at 704&#xa0;nm when excited at 408&#xa0;nm. A doping concentration of 5&#xa0;mol % was determined to be optimal. The Inokuti-Hirayama model and Dexter’s theory were used to validate the dipole-dipole type of interlinkages as a genuine phenomenon for concentration quenching. Quantum efficiency (85.14%), non-radiative rate (211.2&#xa0;s<sup>− 1</sup>), and radiative lifetime (0.7032 ms) are computed. The Commission Internationale de I’Éclairage (CIE) chromaticity coordinates indicated that the phosphor materials exhibited a high level of colour purity (92.39%). Additionally, the latent fingerprint (LFP) images stained with the produced nanophosphor exhibit outstanding visualization capabilities on numerous surfaces. According to these findings, fabricated nanophosphors have the potential to be useful for white LED applications and LFP identification.</p>

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Combustion synthesis and luminescent characteristics of Sm3+ - activated Ca8ZnGd(VO4)7 for application in optoelectronic devices and latent fingerprinting

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Neeraj Sehrawat,
  • Poonam Devi,
  • Diksha Solanki,
  • Neelam Kumari,
  • R. Punia,
  • R. K. Malik,
  • Sapana Garg

摘要

A series of deep reddish - orange emitting Sm3+ - activated Ca8ZnGd(VO4)7 nanophosphors has been successfully produced using the solution combustion technique. Through X-ray diffraction patterns (XRD), the structural properties of the produced nanomaterials are examined. Crystallisation in the trigonal lattice with space group as R3c (161) is confirmed by the Rietveld refinement technique. The morphological and elemental characteristics of the nanomaterials have been thoroughly characterised using SEM, TEM (scanning and transmission electron microscope) and EDAX (energy dispersive X-ray analysis). The Ca8ZnGd1 − x(VO4)7:xSm3+ (x = 5 mol %) samples exhibited a noticeable emission peak at 704 nm when excited at 408 nm. A doping concentration of 5 mol % was determined to be optimal. The Inokuti-Hirayama model and Dexter’s theory were used to validate the dipole-dipole type of interlinkages as a genuine phenomenon for concentration quenching. Quantum efficiency (85.14%), non-radiative rate (211.2 s− 1), and radiative lifetime (0.7032 ms) are computed. The Commission Internationale de I’Éclairage (CIE) chromaticity coordinates indicated that the phosphor materials exhibited a high level of colour purity (92.39%). Additionally, the latent fingerprint (LFP) images stained with the produced nanophosphor exhibit outstanding visualization capabilities on numerous surfaces. According to these findings, fabricated nanophosphors have the potential to be useful for white LED applications and LFP identification.