The single component (SC) white-light emitting (WLE) metal-organic frameworks based on europium (Eu-MOFs), which could be applied in lighting and display, have drawn great attention but have rarely been exploited. In this work, we dedicated to design and synthesize SC-WLE Eu-MOFs via a dichromatic strategy on the balance of simultaneous ligand-based and Eu-based emissions. The Eu-MOF {[Eu(obb)(HO)]·(HO)} (IAM16-3) generated via the self-assembly of the flexible ligand 4,4'-oxybisbenzoic acid (Hobb) and europium ions displays fascinating excitation-wavelength-dependent photoluminescence (EWDP) property. Upon different excitation wavelengths, tunable WLE through manipulating the intensity ratio of characteristic emissions of Eu ions and ligand-based emissions was performed. To the best of our knowledge, this is the first example for Eu-MOFs to yield SC-WLE stemming from EWDP property. Three isomorphic lanthanide-based MOFs (LnMOFs), that is, {[Ln(obb)(HO)]·(HO)} (Eu: IAM16-3; Tb: IAM16-4; Dy: IAM16-5) based on the flexible bridging linker, that is, 4,4'-oxybisbenzoic acid (Hobb), were obtained. The Eu-MOF, showing with EWDP property, is the first example of SC WLE Eu-MOFs via a dichromatic strategy on the balance of the simultaneous ligand-based and Eu(III)-based emissions at different excitation wavelengths.
An inert shell has been proved to alleviate the concentration effect by not only considerably improving the upconversion intensity, but also greatly preserving the integrity of the upconversion profile, when the emitter concentration was enhanced from 2 mol% to 20 mol%.
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