Patent ID: 8168998
Filing Date: 2012-05-01
Classification: H01L

Abstract:
1. A light emitting device comprising: a flip-chip light emitting diode (LED) die on a submount; a reflective layer, having a reflectivity of at least 90% for visible wavelengths, formed on a top surface of the submount; a transparent substantially hemispherical first layer encapsulating the LED die, the first layer having a first index of refraction; a substantially hemispherical second layer surrounding the first layer the second layer comprising a sol-gel that has been dried to form a porous layer so as to have a second index of refraction lower than the first index of refraction; and a substantially hemispherical phosphor layer formed over the second layer, the second layer having characteristics that cause the second layer to reflect light from the phosphor layer at least when the light is greater than a certain angle with respect to the second layer, wherein the reflective layer on the top surface of the submount extends at least below a portion of the phosphor layer.