Abstract
We report the design and synthesis of a novel kind of organic-inorganic hybrid material via the incorporation of europium (III) β-diketonate complexes (Eu(TTA)3, TTA = 2-thenoyltrifluoroacetone) into one-dimensional (1D) porous boron nitride (BN) microfibers. The developed Eu(TTA)3@BN hybrid composites with typical 1D fibrous morphology exhibit bright visible red-light emission on UV illumination. The confinement of Eu(TTA)3 within pores of BN microfibers not only decreases the aggregation-caused quenching in solid Eu(TTA)3, but also improves their thermal stabilities. Moreover, The strong interactions between Eu(TTA)3 and porous BN matrix result in an interesting energy transfer process from BN host to TTA ligand and TTA ligand to Eu3+ ions, leading to the remarkable increase of red emission. The synthetic approach should be a very promising strategy which can be easily expanded to other hybrid luminescent materials based on porous BN.
Highlights
We report the design and synthesis of a novel kind of organic-inorganic hybrid material via the incorporation of europium (III) β-diketonate complexes (Eu(TTA)[3], to the ligand (TTA) = 2-thenoyltrifluoroacetone) into one-dimensional (1D) porous boron nitride (BN) microfibers
The synthesis of Eu(TTA)3@BN was realized via a two-step method: the loading of Eu3+ ions into porous BN microfibers was achieved by adsorption of Eu3+ ions in ethanol solution dispersed with porous BN, and the organic ligands TTA was inserted into Eu3+@BN by a gas diffusion method
Excited state is transferred to the ligands TTA; (3) the ligands TTA is excited to the singlet excited state, and the energy is transferred to the triplet excited state through intersystem crossing (ISC); (4) energy transfers from the triplet state of the ligands to the excited 4f states of Eu3+ ions; (5) red emission can be obtained through the f-f transitions in Eu3+ ions
Summary
Excited state is transferred to the ligands TTA; (3) the ligands TTA is excited to the singlet excited state, and the energy is transferred to the triplet excited state through intersystem crossing (ISC); (4) energy transfers from the triplet state of the ligands to the excited 4f states of Eu3+ ions; (5) red emission can be obtained through the f-f transitions in Eu3+ ions This interesting energy transfer process is quite different from those in earlier reported hybrid system, i.e. lanthanide complexes encapsulated in zeolites, SBA-15, MCM-41, etc, in which only effective energy transfer from the organic ligands to the Ln3+ ion (the so-called “antenna effects”) takes place. We believe that the space restriction of the europium (III) complexes by the pores of BN microfibers is the main factor for the improvement of their thermal stability
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