Akademik Veri Yönetim Sistemi
Journal of Electronic Materials, 2026 (SCI-Expanded, Scopus)
Two red-emitting double perovskite phosphors, Sr2Gd0.9TaO6:0.10Eu3+ and Sr2Gd0.9TaO6:0.10Eu3+, 0.50B3+, were synthesized by a conventional solid-state method and investigated with a focus on their structural characteristics, thermal stability, and latent fingerprint (LFP) visualization performance. X-ray diffraction confirmed that both compositions crystallize in a single-phase monoclinic P21/n structure without detectable impurities, while scanning electron microscopy (SEM) analysis revealed that B3+ codoping promotes grain growth and microstructural densification through a flux-assisted sintering mechanism, and scanning transmission electron microscopy (STEM) observations further confirmed nanocrystallite sizes in the range of 30–45 nm. The photoluminescence behavior and Judd–Ofelt (JO) spectroscopic parameters of this system have been previously reported, demonstrating that B3+ codoping increases the local asymmetry around Eu3+ ions and enhances radiative transition probabilities. The experimentally measured internal quantum efficiency (IQE), consistent with the increasing trend observed in the previously reported JO analysis, is 36.8% for Sr2Gd0.9TaO6:0.10Eu3+ and 76.2% for Sr2Gd0.9TaO6:0.10Eu3+, 0.50B3+, highlighting the beneficial role of B3+ introduction in enhancing radiative efficiency. Temperature-dependent photoluminescence measurements performed between 300 K and 473 K reveal good thermal robustness for the Eu3+–B3+ codoped composition, retaining approximately 79% of its room-temperature emission intensity at 423 K and exhibiting a relatively high activation energy of 0.28 eV, which is higher than that reported for the Eu3+-only counterpart in the literature. In addition, the optimized Sr2Gd0.9TaO6:0.10Eu3+, 0.50B3+ phosphor demonstrates effective latent fingerprint visualization capability on glass, metal, and plastic substrates, yielding high-contrast ridge patterns with clearly resolved Level I–III features under UV excitation. Overall, this study establishes a relationship between the electronic–structural modification induced by B3+ codoping and the observed improvements in thermal stability and forensic visualization performance. The combination of high structural stability, enhanced quantum efficiency, strong resistance to thermal quenching, and effective LFP visualization highlights Sr2Gd0.9TaO6:0.10Eu3+, 0.50B3+ as a promising multifunctional red-emitting phosphor for solid-state lighting and forensic security applications.