abstract

The thin films based on luminescent hydrogen bonded organic frameworks (Hof) have become one of the most excellent materials in optical applications. Therefore, it is very important to develop simple synthesis methods and establish multifunctional applications of Hof based luminescent materials. Recently, the team of Professor Yan Bing of Tongji University has successfully prepared a double emission Eu3+ functionalized HOF hydrogel film (1). When the UV lamp is turned off, it emits blue-green long afterglow with a long afterglow life of 1.99 s. The detection of ofloxacin and flemequine was in accordance with the mode of chroma and ratio.

The fluorescence response mechanism of 1 pair of ofloxacin and flemequine was deeply studied, and a high security anti-counterfeiting platform was constructed by using these mechanisms. The anti-counterfeiting platform based on thin film can encrypt the information according to different fluorescence response, and can also obtain specific information by controlling the intensity of long afterglow and excitation light. This study not only provides a representative case of preparing double emitting Eu3+ functionalized HOF based hydrogel films, but also opens up possibilities for HOF based thin films as multifunctional intelligent luminescent materials. The related papers are published in advanced functional materials with the title of facile fabrication of luminescent EU (III) functionalized Hof hydrogel film with multifunctional: quinolones fluorescent sensor and anticounterfeiting platform.

Main picture

Characteristics of mixed materials

Fig. 1a) photo 1. b) Ma-ipa (blue line) and 1 (red line) experimental PXRD diagram and simulated PXRD diagram (black line). c. D) SEM images of EDX mapping images of N and EU elements in 1. E, f) 1, g) XPS spectra of EU 3D electrons in EU (NO3) 3 · 6H2O and 1. H) O 1s in EU (NO3) 3 · 6H2O MA-IPA@SA Film and 1

Fluorescence PL characteristics

Fig. 2a) 1 emission spectrum. b) The RTP decay lifetime of 488 nm emission peak of 1. c) T1 → S0 emission histograms of 1 in various QL solutions. d) In various QL solutions, the histogram of 5d0 → 7f0 emission of 1. e) The photo of 1 was taken from various solutions under 310 nm UV lamp.

Of and sensing performance of sensing mechanism

Fig. 3a) fluorescence response of ma-ipa in 1 to of. b) The photo of 1 taken from of solution was emitted, and the concentration increased from 10-9 to 10-3 M. c) Fluorescence response of ma-ipa in 1 to of mechanism (ISC: cross between systems)

Sensing performance of FQ and sensing mechanism

FIG. 4A) emission spectra of 1 extracted from different concentrations of FQ solution (10-9 – 10-3 m)（ λ ex=310 nm)。 b) The dependence of emission intensity ratio at 593 nm (5d0 → 7F1) and 616 nm (5d0 → 7f2) on FQ concentration（ λ ex=310 nm)。 c) The photo of 1 taken from FQ solution was emitted, and the concentration increased from 10-9 to 10-3 M.

Application in information encryption and decryption

Fig. 5a) thin film anti-counterfeiting array based on 1 and 1-Of, showing the "8" and "6" encryption and decryption process. b) The film anti-counterfeiting array based on 1 and 1-Of shows the process of "yes" and "not" encryption, decryption and decoding.

Fig. 6 A) based on the membrane anti-counterfeiting platform containing 1, OF- and FQ hydrogel, the "TJ" encryption process is displayed through molecular diffusion process. b) Based on the film anti-counterfeiting platform in Figure 1, the "TJ" decryption process is shown（ λ Ex = 310 nm) and "t" secondary decryption process（ λ ex=365 nm）。 c) The film anti-counterfeiting platform based on 1 shows the decryption process of "Fu"（ λ Ex = 310 nm) and the second decryption process（ λ ex=365 nm）。

summary

The team built a dual emitter based on a simple synthesis strategy Eu@MA-IPA@SA The film (1). Chroma and ratio fluorescence sensing mode, high selectivity, high sensitivity and low DL of 1 pair of of of and FQ indicate that dual emission 1 is an excellent fluorescence sensor for drug detection. The fluorescence response mechanism of of of and FQ is not only deeply explored, but also used to build an excellent optical anti-counterfeiting platform for information encryption and decryption. By controlling the intensity of long afterglow and excitation, specific information can be obtained on demand. This work provides a simple and feasible method for the preparation of double emitting Eu3+ functionalized HOF based hydrogel films, which widens the practical application of the next generation HOF based light-emitting films.

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