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- Title
A new Eu<sup>3+</sup>-activated milarite-type potassium magnesium zinc silicate red-emitting phosphor for forensic applications.
- Authors
Kanmani, G. V.; Ponnusamy, V.; Rajkumar, G.; Kennedy, S. M. M.
- Abstract
A versatile solid-state technique was employed for synthesizing K2Mg3Zn2Si12O30:Eu3+ (KMZS:Eu3+) phosphors. The hexagonal structure of the as-prepared samples was validated with powder X-ray diffraction. The preferential occupancy sites of Eu3+ in KMZS host have been discussed using the bond energy model. The emission spectrum of the as-prepared KMZS:Eu3+ phosphor exhibits a dominant peak at 615 nm, corresponding to the 5D0 → 7F2 transition, resulting in intense red-emission under λex = 393 nm excitation. The study of luminescence properties of KMZS:Eu3+ as a function of Eu3+ ion concentrations shows that the strongest emission intensity occurs at 13 mol% with CIE coordinates (0.6304, 0.3665) close to standard red emission (0.677, 0.333). The decline in intensity after 13 mol% of Eu3+ is due to quadrupole–quadrupole interaction among Eu3+ activators. Furthermore, Judd–Ofelt (J–O) theory was used to calculate the Ω2 and Ω4 parameters for phosphors from the emission spectra. The calculated and radiative parameters were also predicted from the emission spectrum of the optimized concentration of Eu3+ to evaluate their suitability for lasing and photonic applications. The KMZS:Eu3+ phosphor exhibits good thermal stability. The multilevel features of the latent fingerprint were observed clearly with high contrast, selectivity, and sensitivity under 254-nm UV light. The above results indicate that KMZS:Eu3+ phosphor can be a promising luminescent material in fingerprint identification and anti-counterfeiting applications.
- Publication
Journal of Materials Science: Materials in Electronics, 2023, Vol 34, Issue 8, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-023-10087-5