In one embodiment, sub-micron size granules of TiO2, ZrO2, or other white colored non-phosphor inert granules are mixed with a silicone encapsulant and applied over an LED. In one experiment, the granules increased the light output of a GaN LED more than 5% when the inert material was between about 2.5-5%...http://www.google.fr/patents/US7791093?utm_source=gb-gplus-shareBrevet US7791093 - LED with particles in encapsulant for increased light extraction and non-yellow off-state color
LED with particles in encapsulant for increased light extraction and non ...
