PHOSPHOR-CONVERTED LED WITH LUMINANCE ENHANCEMENT THROUGH LIGHT RECYCLING

摘要

A light source (300) includes an LED chip (110) that emits light having a first central wavelength; a dichroic layer (120) on the LED chip (110), the dichroic layer (120) transmitting therethrough light having the first central wavelength, and reflecting light having a second central wavelength; a phosphor layer (130) on the dichroic layer (130) that converts light having the first central wavelength into light having the second central wavelength; an angular filter (140) on the phosphor layer (130) transmitting light within a transmission cone, and reflecting light outside the transmission cone; and a reflective polarizer (150) on the angular filter (140) transmitting light having a first polarization and reflecting light having a second polarization orthogonal to the first polarization.