Mesoporous hybrids containing Eu3+ complexes covalently bonded to SBA-15 functionalized: Assembly, characterization and photoluminescence

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Abstract

A novel series of luminescent mesoporous organic–inorganic hybrid materials has been prepared by linking Eu3+ complexes to the functionalized ordered mesoporous SBA-15 which was synthesis by a co-condensation process of 1,3-diphenyl-1,3-propanepione (DBM) modified by the coupling agent 3-(triethoxysilyl)-propyl isocyanate (TEPIC), tetraethoxysilane (TEOS), Pluronic P123 surfactant as a template. It was demonstrated that the efficient intramolecular energy transfer in the mesoporous material Eu(DBMSi-SBA-15)3phen mainly occurred between the modified DBM (named as DBM-Si) and the central Eu3+ ion. So the Eu(DBMSi-SBA-15)3phen showed characteristic emission of Eu3+ ion under UV irradiation with higher luminescence quantum efficiency. Moreover, the mesoporous hybrid materials exhibited excellent thermal stability as the lanthanide complex was covalently bonded to the mesoporous matrix.

Graphical abstract

A novel organic–inorganic mesoporous luminescent hybrid materials is prepared by linking the binary and ternary Eu3+ complexes to the functionalized ordered mesoporous SBA-15 with the modified 1,3-diphenyl-1,3-propanepione (DBM) via a co-condensation process of tetraethoxysilane (TEOS) in the presence of Pluronic P123 surfactant as a template.

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Section snippets

1. Introduction

It is well known that RE complexes can give sharp, intense emission lines upon ultraviolet light irradiation, because of the effective intramolecular energy transfer from the coordinated ligands to the luminescent central lanthanide ion, which in turn undergoes the corresponding radiative emitting process (i.e., “antenna effect”) [1]. Some of the RE complexes have potential applications in efficient light-conversion molecular devices and organic light-emitting devices [2], [3], [4], [5]. But,

Chemicals

Pluronic P123 (EO20PO70EO20) and tetraethoxysilane were purchased from Aldrich. 3-(triethoxysiyl)-propyl isocyanate (TEPIC) was supplied by Lancaster. The solvent tetrahydrofuran (THF) was used after desiccation with anhydrous calcium chloride. Europium nitrate [Eu(NO3)3] was obtained by dissolving Eu2O3 in concentrated nitric acid (HNO3).

Synthesis of DBM-functionalized SBA-15 mesoporous material (denoted as DBMSi-SBA-15)

The modified precursor DBM-Si was prepared according to the procedure reported in the literature, described as follows: Firstly, 1,3-diphenyl-1,3-propanepione

DBM-functionalized mesoporous silica SBA-15

Fig. 2 shows the UV absorption spectra of DBM (A), DBM-Si (B). Comparing the absorption spectrum of DBM-Si (B) with that of DBM (A), the absorption band corresponded to the ππ* electronic transition locate at different wavelength. There was a blue shift from 342 to 334 nm. The blue shift indicates the DBM was successfully grafted by 3-(triethoxysilyl)-propyl isocyanate because the modifications influence the energy difference levels among electron transitions.

The IR spectra of the DBM (A),

Conclusion

In summary, we successfully linked the Eu3+ complexes to the ordered SBA-15 mesoporous host by the modification of 1,3-diphenyl-1,3-propanepione with 3-(triethoxysilyl)-propyl isocyanate using a co-condensation method. The synthesis of DBMSi-SBA-15 provides a convenient approach of tailoring the surface properties of mesoporous silicates by organic functionalization, and the resulting materials all retain the ordered mesoporous structures. The efficient intramolecular energy transfers from the

Acknowledgments

This work was supported by the National Natural Science Foundation of China (20671072) and Program for New Century Excellent Talents in University (NCET 2008).

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