A highly stable ScNb2VO9:Eu3+phosphor with wide band excitation for visualization of latent fingerprints based on the powder dusting method

A series of ScNb2VO9:xEu3+ (x = 0.5, 1, 2, 5, 20, 30, 40, and 45 mol%) red-emitting phosphors was achieved by the high-temperature solid-state reaction. The ScNb2VO9:20 mol%Eu3+ phosphor exhibits a red emission around 618 nm (5D0 -> 7F3 transition) under 324 nm excitation. The phosphor presents the wide excitation with charge transfer band (CTB) from O2--V5+ and O2--Eu3+ transitions between 225 and 360 nm. The prepared ScNb2VO9:20 mol%Eu3+ phosphor shows high thermal stability, high moisture resistance stability, and high UV radiation stability. The features of the latent fingerprint (LFP) created by ScNb2VO9:Eu3+@oleylamine can be clearly reflected on different surfaces based on the powder dusting method. The experiment results demonstrate the superiority of the ScNb2VO9:Eu3+ phosphor in the field of LFP development.

Automated summary

A series of red-emitting phosphors, ScNb2VO9:xEu3+ (x = 0.5, 1, 2, 5, 20, 30, 40, and 45 mol%), were prepared by high-temperature solid-state reaction. The ScNb2VO9:20 mol%Eu3+ phosphor exhibited red emission at 618 nm (5D0 -> 7F3 transition) under 324 nm excitation. The phosphor showed wide excitation with charge transfer band (CTB) from O2--V5+ and O2--Eu3+ transitions between 225 and 360 nm. The prepared ScNb2VO9:20 mol%Eu3+ phosphor demonstrated high thermal stability, moisture resistance stability, and UV radiation stability. The ScNb2VO9:Eu3+ phosphor combined with oleylamine showed clear features of latent fingerprint (LFP) on different surfaces using the powder dusting method, highlighting its superiority in LFP development.