Light-emitting device comprising a dome-shaped ceramic phosphor

A light-emitting device comprising:

• a light-emitting diode;
• a substantially transparent encapsulating material disposed to allow at least a portion of light from the light-emitting diode to pass through the encapsulating material, wherein the encapsulating material has a substantially dome-shaped outer surface and a refractive index in the range of about 1.3 to about 1.8
• a layer of low refractive index material disposed to allow at least a portion of the light passing through the encapsulating material to pass through the layer of low refractive index material, wherein the low refractive index material has a refractive index of in the range of about 1 to about 1.2 and is substantially dome-shaped with substantially uniform thickness;
• and
• a translucent ceramic phosphor disposed to receive at least a portion of the light passing through the layer of low refractive index material and convert at least a portion of the light received to light of a different wavelength, wherein the ceramic phosphor has a refractive index in the range of about 1.6 to about 2.7, and is substantially dome-shaped with substantially uniform thickness.