Fig. 1: Large Stokes shift emitters concept, applications and realization with engineered hetero-ligand MOF nanocrystals based on fluorescent ligands. | Nature Communications

Fig. 1: Large Stokes shift emitters concept, applications and realization with engineered hetero-ligand MOF nanocrystals based on fluorescent ligands.

From: Highly luminescent scintillating hetero-ligand MOF nanocrystals with engineered Stokes shift for photonic applications

Fig. 1

a Definition of large Stokes shift emitter. The energy difference between absorption and luminescence maxima ΔΕ is larger than luminescence half-height bandwidth 2σ, thus avoiding reabsorption. b (left) Molecular structure of the MOF nanocrystals building blocks, namely the 9,10-diphenyl-antracenedicarboxylate fluorescent ligand (DPA), the 5,12-diphenyl-tetracenedicarboxylate fluorescent co-ligand (DPT) and the linking node zirconium oxo-hydroxy cluster. (right) Sketch of the energy flux after generation of a DPA singlet exciton, in this case upon absorption of a UV photon of energy hνin. The singlet exciton diffuses within the crystalline framework until it reaches the co-ligand DPT. The latter is excited by non-radiative energy transfer and then recombines radiatively by emitting a green photon of energy hνout with a Stokes shift ΔΕ = hvin − hvout.

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