Novel organic–inorganic hybrid powder SrGa₁₂O₁₉:Mn²⁺–ethyl cellulose for efficient latent fingerprint recognitionviatime-gated fluorescence

Abstract

A easy and efficient strategy for latent fingerprints recognition was developed by this work.

Chromium Ion Pair Luminescence: A Strategy in Broadband Near-Infrared Light-Emitting Diode Design

“…In contrast, the 4 T 2 → 4 A 2 transition is expected to have a much shorter decay time (microsecond range). Thus, the broadband emission arises from the spin-forbidden 2 E → 4 A 2 transition, contrary to previous reports. − Xu et al report decay time in the ms range for the SrGa 12 O 19 :Cr 3+ phosphor at 750 nm, although the exact decay time and absence of corresponding structural information make further comparison difficult. Similarly, a decay time of ∼2 ms is observed for the Cr 3+ –Cr 3+ ion pair in the Cr 3+ -doped LaAlO 3 perovskite material .…”

“…The magnetoplumbite type structures with formula A [ B 12 ]­O 19 offer an opportunity for a stronger Cr 3+ –Cr 3+ ion pair signal due to the availability of five independent crystallographic sites for the B site cation, where cation B may have valence ranging from 2+ to 5+. , Therefore, the magnetoplumbite type structure provides a versatile host system in which to tune luminescent optical properties. For example, Xu et al reported SrGa 12 O 19 :Cr 3+ (λ em = 750 nm) for long-persistence applications, while the narrowband green-emitting SrGa 12 O 19 :Mn 2+ (λ em = 505 nm) is integrated with ethyl cellulose for the latent fingerprints visualization in anticounterfeiting applications . Similarly, LaMgAl 11 O 19 :Cr 3+ (λ em = 698 nm) is co-doped with Yb 3+ ions for the requirements of emission at 980 nm in solar energy conversion .…”

“…For example, Xu et al reported SrGa 12 O 19 :Cr 3+ (λ em = 750 nm) for long-persistence applications, 19 while the narrowband greenemitting SrGa 12 O 19 :Mn 2+ (λ em = 505 nm) is integrated with ethyl cellulose for the latent fingerprints visualization in anticounterfeiting applications. 20 Similarly, LaMgAl 11 O 19 :Cr 3+ (λ em = 698 nm) is co-doped with Yb 3+ the requirements of emission at 980 nm in solar energy conversion. 21 The quantum efficiency and thermal stability are the two critical parameters that eventually determine the phosphor host effectiveness.…”

Carbohydrate biopolymers, lignin based adsorbents for removal of heavy metals (Cd2+, Pb2+, Zn2+) from wastewater, regeneration and reuse for spent adsorbents including latent fingerprint detection: A review

“… [ 126 ] Tb doped gadolinium aluminate nanophosphors (GdAlO 3 :Tb 3+ ) -Yield a correct picture of the entire fingerprint with excellent accuracy and contrast. [ 127 ] -Highly efficient -Fast SrGa 12 O 19 :Mn 2+ -Strong chemical stability [ 128 ] -Can last up to months -All 3 levels of LFP could be obtained favourabling selectivity. NaYF 4 :Yb,Er,Gd fluorescent upconversion nanorods (UCNRs) -Great performance with excellent sensitivity.…”

Novel Organic-Inorganic Hybrid Polystyrene Nanoparticles with Trichromatic Luminescence for the Detection of Latent Fingerprints

“…e sensitivity of fluorescence detection usually is high even when the concentration of the analytes is very low. For example, quantum dots [26][27][28], metal colloids [29], and fluorescent upconversion nanoparticles [30][31][32] have been successfully utilized for the visualization of fingerprints [33][34][35][36]. However, typical fluorescent materials are usually monochromatic, which are difficult to be applied to the object with complex multicolor background and hard to distinguish the difference between fingerprint lines and multicolor background [34].…”