Designing orange-red emitting luminescent platform for data security and information encryption based Sm3+ doped BLAO phosphor

Abstract

Due to the features of great difference and invariability, latent fingerprint (LFP) and lip print (LP) detection has grown to be a vital part of criminal investigation. Due to its environmental friendliness, powder dusting is now the method of choice for visualizing LFPs. The uses of this technology are severely constrained by essential flaws like limited resolution, low sensitivity, and high background interference. To address these issues, a novel orange red emitting BaLaAlO4:Sm3+ (1–5 mol %) (BLAO:Sm) phosphor has been fabricated via solution combustion route. The 4G5/2 → 6H7/2 transition of Sm3+ ions caused the phosphor to generate intense orange-red light at 601 nm under stimulation at 402 nm. The optimal Sm3+ concentration in BLAO is 2 mol % (BLAO:2Sm). The International Commission on Illumination evaluated the colour coordinates (CC), correlated colour temperature (CCT), and colour purity (CP) values based on the photoluminescence emission (PLE) profiles. The acquired CC and the typical National Television System Committee (NTSC) coordinates are compared. Additionally, the usefulness of the phosphor is assessed for the powder dusting technique to detect fingerprints (FPs) on various surfaces. The level 1–3 structure of LFPs and the distinct features of lip prints (LPs) are clearly visible utilizing the BLAO:2Sm phosphor under 402 nm, UV illumination. Fluorescent phosphor is fabricated with the necessary thickening agent in order to create AC inks that mark on various surfaces with high resolution without spreading and tracing. When exposed to UV light, the above ink's drawn design instantly developed and is illuminated with vivid orange red fluorescence emission. The results revealed that the optimized phosphor can garner significant interest for use in personal identification, and security encoding.