Coupling of carbon dots in Eu3+ doped dicalcium silicate, derived from marine and agro-waste, offers a luminescent armor for counterfeiting, improving thermal sensing and advancing forensic explorations

•Encapsulation of hydrothermally derived carbon dots into Ca2SiO4:Eu3+ nanophosphors synthesized via combustion method.•Latent fingerprints and lip prints were developed via powder dusting method and studied under diverse experimental conditions.•Temperature dependent photoluminescence studies indic...

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Veröffentlicht in:Materials research bulletin 2025-01, Vol.181, p.113102, Article 113102
Hauptverfasser: Chakradhar, S. Priyanka, Krushna, B.R. Radha, Sharma, S.C., Mohapatra, S.S., Krithika, C., George, Augustine, pasha, Sardar, Manjunatha, K., Wu, Sheng Yun, Vanitha, Veera, Nagabhushana, H.
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Sprache:eng
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Zusammenfassung:•Encapsulation of hydrothermally derived carbon dots into Ca2SiO4:Eu3+ nanophosphors synthesized via combustion method.•Latent fingerprints and lip prints were developed via powder dusting method and studied under diverse experimental conditions.•Temperature dependent photoluminescence studies indicate excellent thermal stability up to 92.6 % at 423 K.•The composite CDs(3 wt %)@Ca2SiO4:3Eu3+ exhibit 4 fold PL intensity compared to Ca2SiO4:3Eu3+ NPs.•The optimized composite opens up a new avenue in display devices and advanced forensic applications. A series of red-emitting composite based on carbon dots in β-Ca2SiO4:Eu3+ (CDs@CSO:Eu3+) nanocomposites (NCs) were synthesized through a solid state (SS) method, aiming to enhance applications in latent fingerprints (LFPs), lip prints (LPs) detection, anti-counterfeiting (AC) techniques and optical thermometry. The powdered X-ray diffraction (PXRD) analysis confirmed the monoclinic crystal structure of the phosphor. Under 394 nm excitation, the Eu3+ doped β-CSO:Eu3+ display a broad red emission peak at 615 nm, attributed to the 5D0→7F2 transition of Eu3+ ions. The optimal concentration of Eu3+ ions is determined to be 3 mol %, as higher concentrations led to a decrease in photoluminescence (PL) emission intensity due to concentration quenching (CQ). Additionally, a fabricated white light emitting diode (w-LED) using these phosphors achieved chromaticity coordinates of (0.355, 0.352) according to the Commission International de L'Eclairage (CIE), with the CIE, correlated colour temperature (CCT), and colour purity (CP) metrics indicating a bright green output with values of (0.6122, 0.3499), 1177 K, and 88.7%, respectively. The optimized 3wt % CDs@β-CSO:3Eu3+ composite demonstrated a remarkable CP of 97.7 %. Notably, the composite maintained 92.6 % of their emission intensity at 420 K, showcasing exceptional thermal stability. The internal quantum efficiency (IQE) is an impressive 85.8%, demonstrating the effectiveness of the process. This study explores the application of composite materials for LFPs detection and cheiloscopy. Utilizing advanced phosphor composites, we achieved enhanced visualization of fingerprints (FPs) features, including level I (ridge patterns), level II (minutiae points), and level III (ridge details such as pores and scars). Additionally, the composite's efficacy is demonstrated in cheiloscopy, capturing detailed LPs across type I to VI categories. The results highlight the composite's su
ISSN:0025-5408
DOI:10.1016/j.materresbull.2024.113102