Porous light-emitting compositions
View Patent ↗Light-emitting devices are prepared by coating a porous substrate using a polymer-assisted deposition process. Solutions of metal precursor and soluble polymers having binding properties for metal precursor were coated onto porous substrates. The coated substrates were heated at high temperatures under a suitable atmosphere. The result was a substrate with a conformal coating that did not substantially block the pores of the substrate.
1. A porous light-emitting composition, comprising:
a porous structure having pores, an interior surface, and an exterior surface, and
a film of a phosphor that coats said interior and exterior surfaces of said porous structure without substantially blocking the pores of said porous structure,
said porous structure comprising a mesoporous silicon or mesoporous silica structure,
said mesoporous silicon or mesoporous silica structure comprising an inverse opal, a photonic crystal, a mobile crystalline material (MCM) that comprises ordered arrays of nonintersecting hexagonal channels, and a porous anodisc having a honeycomb structure.
2. The porous light-emitting composition of claim 1 , wherein said porous structure has pore sizes in a range of from 1 to 500 nm.
3. The porous light-emitting composition of claim 1 , wherein said phosphor comprises a transition metal oxide.
4. The porous light-emitting composition of claim 1 , wherein said phosphor comprises a lanthanide doped metal oxide.
5. The porous light-emitting composition of claim 1 , wherein said phosphor comprises Eu:YVO 3 , Tb:Al 2 O 3 , or a lanthanide-doped Y 3 Al 5 O 12 .
6. The light-emitting device of claim 1 , further comprising an index matching material that fills the pores of said porous structure.