Abstract

The solid-state-lighting revolution is based to a large extend on phosphor converted LEDs, using luminescent materials for partial down-conversion of blue LED light for generation of white light for illumination. Although this architecture has intrinsic efficiency loss mechanisms, it is more efficient and stable than the combination of direct emitting blue, red and green LEDs. By sintering the phosphor material into a dense ceramic body (Lumiramic™), light loss mechanism associated with scattering phosphor powder layers can be reduced to a large extend, allowing also production of phosphor converted (pc)LEDs with saturated emission in the green to red spectral region, outperforming direct emitting LEDs with peak emission wavelength between 520 and 610 nm.

© 2010 Optical Society of America