Intense red emission from trivalent Eu3+ doped Ca9La(VO4)7 nanophosphor for lighting and latent fingerprinting applications

• Published in: Indian journal of physics Vol. 99; no. 5; pp. 1867 - 1879
• Main Authors: Solanki, Diksha, Devi, Poonam, Dalal, Hina, Sehrawat, Neeraj, Kumar, Mukesh, Garg, Ojas, Malik, Rajesh Kumar
• Format: Journal Article
• Language: English
• Published: West Bengal Springer Nature B.V 01.05.2025
• Subjects: Color temperature; Crystallization; Dipole interactions; Energy transfer; Europium; Excitation spectra; Fingerprinting; Nanophosphors; Optical properties; Phosphors; Photoluminescence
• ISSN: 0973-1458; 0974-9845
• DOI: 10.1007/s12648-024-03389-9

A quick, efficient, and environment-friendly solution combustion approach was used to develop intense red light emitting Eu3+ activated Ca9La(VO4)7 nanophosphor. Rietveld’s refinement of patterns obtained from XRD validated the trigonal structure & (R3c 161 space group) of the crystallized nanophosphors. Elemental analysis and surface morphology of the red phosphors were investigated by EDAX and SEM techniques. Tauc’s theory was used to determine the band gap of the host & optimized nanosample. The excitation spectra at 331 nm indicate energy transfer between VO43− → Eu3+ ions, which is confirmed by photoluminescence lifetime measurements. The designated nanophosphors emit bright red light due to the 5D0 → 7F2 radiative transition. Dexter’s hypothesis and I–H model were used to demonstrate that dipole–dipole interactions are a true phenomenon for concentration quenching. Furthermore, the optical properties of Ca9La0.6Eu0.4(VO4)7 nanophosphor exhibit quantum efficacy (58.67%), CIE co-ordinates (0.5192, 0.3313), and color-temperature (1717 K), making it suitable for use in wLEDs, photonic devices and based on the previously mentioned results, the optimum (i.e. Ca9La(1-x)Eux(VO4)7 (x = 0.4 mol%)) nanophosphor was shown to be useful for LFP (latent fingerprinting).