Porous Light-Emitting Compositions

Abstract

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 - 8 . (canceled) 
     
     
         9 . A porous light-emitting composition, comprising:
 a nanostructured support,   a conformal coating of a high refractive index material on said nanostructured support, and   a phosphor coating on the conformal coating.   
     
     
         10 . The porous light-emitting composition of  claim 9 , wherein said nanostructured support comprises a mesoporous silicon or silica support. 
     
     
         11 . The porous light-emitting composition of  claim 10 , wherein said mesoporous silicon or silica support has pore sizes in a range from 1 to 20 nm. 
     
     
         12 . The porous light-emitting composition of  claim 9 , wherein said nanostructured support comprises an inverse opal or a photonic crystal. 
     
     
         13 . The porous light-emitting composition of  claim 9 , wherein said nanostructured support comprises a nanostructured, high surface area metal oxide or metal nitride support. 
     
     
         14 . The porous light-emitting composition of  claim 9 , wherein said phosphor coating comprises a transition metal oxide or a lanthanide-doped metal oxide. 
     
     
         15 . The porous light-emitting composition of  claim 9 , said high refractive index material of said conformal coating comprises a metal oxide. 
     
     
         16 . The porous light-emitting composition of  claim 9 , wherein said high refractive index material of said conformal coating comprises a transition metal oxide or a lanthanide oxide. 
     
     
         17 . The porous light-emitting composition of  claim 9 , wherein said high refractive index material of said conformal coating comprises a zirconium oxide, a bismuth oxide, or a tantalum oxide. 
     
     
         18 . The porous light-emitting composition of  claim 9 , wherein the nanostructured support is filled with an index matching material. 
     
     
         19 . The porous light-emitting composition e of  claim 9 , further comprising a layer upon said porous substrate that is adapted for controlling and guiding light emission from the structure. 
     
     
         20 . The porous light-emitting composition of  claim 9 , further comprising at least two separate metal containing films on surfaces of said porous substrate. 
     
     
         21 . The light-emitting device of  claim 9 , wherein the device has an output of white light.