A novel bright and thermally stable red phosphor Gd2.4Lu0.6Ga4AlO12: Eu3+ regulated by magnetic dipole transition

Latent fingerprint (LFP) detection plays a critical role in forensic science, security, and authentication. Traditional methods often rely on physical or chemical agents, but recent advancements in luminescent materials, particularly rare-earth ion-doped phosphors, have provided a more efficient and non-invasive alternative. These materials, when excited under ultraviolet light, enable the clear visualization of fingerprints on various surfaces, including glass, metal, and paper. Among these, red-emitting phosphors with high color purity have shown exceptional effectiveness in fingerprint detection. This study focuses on the development of a red phosphor doped with Eu³⁺ ions in Gd_2.4Lu_0.6Ga₄AlO₁₂, which exhibits high color purity, excellent thermal stability, and strong luminescent properties. A comprehensive analysis of its structural, morphological, and thermal properties was conducted, demonstrating its potential as an effective labeling marker for latent fingerprint detection.