Patent ID: 8496852

Claim:
A method of producing a ceramic structure, the method comprising: making a polycrystalline ceramic structure comprising a phosphor embedded in a ceramic matrix comprising non-luminescent polycrystalline alumina, wherein the phosphor comprises (Lu 1-x-y-a-b Y x Gd y ) 3 (Al 1-z Ga z ) 5 O 12 :Ce a Pr b wherein 0<x≦1; 0≦y<1; 0≦z≦0.1; 0≦a≦0.2; 0≦b ≦0.1; and a+b>0 , the ceramic matrix comprises 80 to 99.99 vol. % alumina and 0.01 to 20 vol. % phosphor, and making a polycrystalline ceramic structure comprises: converting a powder of phosphor and alumina particles into a slurry, shaping the slurry into a polycrystalline phosphor-containing ceramic alumina composite structure, and applying a thermal treatment.