Phosphor reflector assembly for remote phosphor led device

A remote phosphor lighting system that provides a broadband light output, the system comprising:

• one or more LEDs adapted to emit LED light having one or more emission peaks in a range from 400 to 500 nm;
• and
• an assembly including a phosphor layer and a broadband reflector attached to the phosphor layer, the phosphor layer configured to absorb a portion of the LED light and emit phosphor light in response to the absorbed LED light, and the broadband reflector having a reflectivity of at least 90% for the LED light and for the phosphor light;
• wherein the broadband light output comprises a portion of the phosphor light emitted by the assembly and a portion of the LED light reflected by the assembly;
• and
• wherein the phosphor layer has a phosphor concentration and physical thickness tailored to provide a single pass transmission of the LED light through the phosphor layer of T, where T is selected to maximize the broadband light output.

An assembly for use in a remote phosphor LED device in which the assembly is illuminated with LED light, the assembly comprising:

• an array of one or more LEDs to emit first LED light in the range of 400 to 500 nm;
• a phosphor layer configured to absorb a portion of the first LED light and emit phosphor light in response to the absorbed first LED light;
• at least one additional LED to emit red LED light;
• a dichroic reflector configured to reflect a first portion of the first LED light, to transmit a second portion of the LED light, to transmit the red LED light, and to transmit a portion of the phosphor light;
• and
• a broadband reflector attached to the phosphor layer,
• wherein the broadband reflector has a reflectivity of at least 90% for the first LED light and for the phosphor light.