Luminescence conversion led

Abstract

A luminescence conversion LED having a radiation emitting chip that is connected to electrical connections and is surrounded by a housing that comprises at least a basic body and a cap, the chip being seated on the basic body, in particular in a cutout of the basic body, and the primary radiation of the chip being converted at least partially into longer wave radiation by a conversion element, wherein the cap is formed by a vitreous body, the conversion means being contained in the vitreous body, the refractive index of the vitreous body being higher than 1.6, preferably at least n=1.7.

1 . A luminescence conversion LED having a radiation emitting chip that is connected to electrical connections and is surrounded by a housing that comprises at least a basic body and a cap, the chip being seated on the basic body, in particular in a cutout of the basic body, and the primary radiation of the chip being converted at least partially into longer wave radiation by a conversion element, wherein the cap is formed by a vitreous body, the conversion means being contained in the vitreous body, the refractive index of the vitreous body being higher than 1.6, preferably at least n=1.7. 
     
     
         2 . The LED as claimed in  claim 1 , wherein the vitreous body is formed from crown or flint glasses. 
     
     
         3 . The LED as claimed in  claim 2 , wherein the vitreous body is formed from barite flint, boron crown or lanthanum crown glass. 
     
     
         4 . The LED as claimed in  claim 1 , wherein the phosphor is a highly stable phosphor of the garnet or oxinitride type. 
     
     
         5 . The LED as claimed in  claim 1 , wherein the vitreous body is largely free from lead oxide. 
     
     
         6 . The LED as claimed in  claim 1 , wherein the vitreous body is based on a bismuth containing borate glass. 
     
     
         7 . The LED as claimed in  claim 1 , wherein the vitreous body is based on a phosphate glass. 
     
     
         8 . The LED as claimed in  claim 4 , wherein the vitreous body is based on a glass whose main component is Al 2 O 3 . 
     
     
         9 . The LED as claimed in  claim 1 , wherein the vitreous body contains at least one of the ions Pb 2+ , Bi 3+ , Ba 2+ , Li +  and Ti 4+  in a quantity sufficient to implement a refractive index of at least n≧1.6, in particular n≧1.7. 
     
     
         10 . A method for producing a luminescence conversion LED as claimed in  claim 1 , wherein the following method steps are used during production:
 a) sintering a mixture of phosphor and glass powder, in particular pressed so as to minimize air inclusions, to a temperature in the vicinity of the softening point of the glass.   
     
     
         11 . A method for producing a luminescence conversion LED as claimed in  claim 1 , wherein the following method steps are used during production:
 a) producing a liquid melt from glass, or suitable precursor materials with phosphor powder suspended therein;   b) spraying the liquid melt.   
     
     
         12 . A method for producing a luminescence conversion LED as claimed in  claim 1 , wherein the following method steps are used during production:
 a) producing a layer of defined thickness from phosphor and optionally glass powder, binder and other additives on a glass substrate;   b) optionally repeating step a) until the desired layer thickness is achieved; and   c) sintering at a temperature close to the softening point of the glass.   
     
     
         13 . A method for producing a luminescence conversion LED as claimed in  claim 1 , wherein the following method steps are used during production:
 a) applying a phosphor layer made from particles to a substrate, in particular directly to a chip;   b) depositing glass or glass precursors from the gas phase into the interspaces between the phosphor grains.   
     
     
         14 . A method for producing a luminescence conversion LED as claimed in  claim 1 , wherein the following method steps are used during production:
 a) producing a liquid melt from glass,   b) precipitating phosphor particles from the glass melt.