HYBRID LIGHT BULBS USING COMBINATIONS OF REMOTE PHOSPHOR LEDS AND DIRECT EMITTING LEDS

摘要

A light source suitable for general lighting applications combines at least one remote phosphor LED and at least one direct emitting LED in a single unit. Both the remote phosphor LED and the direct emitting LED are carried by a base and covered by a bulb or other suitable cover member, which may be light-diffusing. The remote phosphor LED includes a first LED, a phosphor layer, and a first dichroic reflector. Excitation light from the first LED is reflected by the first dichroic reflector onto the phosphor layer to generate phosphor light, which is substantially transmitted by the first dichroic reflector. At least some light from the direct emitting LED propagates to the cover member without passing through any dichroic reflector, including the first dichroic reflector. The light source may provide white light output using relatively small amounts of phosphor material.

主权项

1. A light source for emitting broadband output light, comprising:
a base; a light-transmissive cover member attached to the base; a first LED, a second LED, a first phosphor layer, and a first dichroic reflector carried by the base and covered by the cover member; wherein the first dichroic reflector is configured to reflect at least some excitation light from the first LED onto the first phosphor layer to cause the first phosphor layer to emit first phosphor light, the first dichroic reflector also configured to substantially transmit the first phosphor light; wherein the second LED is disposed to emit at least some light that propagates from the second LED to the cover member without passing through any dichroic reflector including the first dichroic reflector.