Abstract
Latent fingerprint detection is usually interfered by background fluorescence of substrates. Development of novel reagents to achieve background-free latent fingerprint imaging is a challenging task. Herein, one-step pyrolytic synthesis of carbonized polymers (CPs) gel-like solid with intense green room-temperature phosphorescence (RTP) emission by using phosphoric acid and ethylenediamine as precursors was developed. Furthermore, phosphorescent fingerprint powder can be easily obtained by dispersing CPs in silica gel. The resultant CPs and silica (CPs@silica) composite powder shows bright blue fluorescence (FL) and strong green phosphorescence under ambient conditions. Given the unique RTP performance, CPs@silica powder was successfully applied to visualize latent fingerprints (LFPs) on diverse substrates with strong background fluorescence. The results indicated that CPs@silica powder could effectively eliminate background fluorescence interference and realize well-resolved fingerprint patterns, especially specific details such as bridge, ridge ending, bifurcation, and enclosure can be clearly recognized. The excellent phosphorescence properties of CPs@silica powder are significant developments for conventionally used fluorescent markers for latent fingerprint visualization. CPs@silica powder can be a distinguished phosphorescent fingerprint powder for background-free latent fingerprint imaging.
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