Green and red emitting YBO3:Ln3+ (Ln=Eu, Tb) phosphors for detection of latent fingerprint

Abstract In this paper, we report the synthesis of green and red emitting YBO 3 :Ln 3+ (Ln = Eu, Tb) phosphors through a solvothermal method. The crystal structure of YBO 3 :Ln 3+ (Ln = Eu, Tb) phosphors is well crystallized. The photoluminescence spectra of YBO 3 :Ln 3+ (Ln = Eu, Tb) phosphors exhibit the strong green and red emission. The photoluminescence intensity is increased with increasing Ln 3+ ion concentration from 0.01 to 0.07 mol. The latent fingerprints developed on various substrates using YBO 3 :Ln 3+ (Ln = Eu, Tb) phosphors exhibited the highly clear ridge patterns of fingerprints regardless of background interference. Also, the detailed minutiae of fingerprint with different levels can be clearly observed. Therefore, YBO 3 :Ln 3+ (Ln = Eu, Tb) phosphors can be applied to luminescent materials for detection of latent fingerprint.