LIGHTING DEVICE WITH PLURAL FLUORESCENT MATERIALS

摘要

Provided is a light-emitting device that has a high emission efficiency, excellent stability and temperature properties, and that generates light having a high color rendering property sufficient for practical use. This semiconductor light-emitting device comprises a semiconductor light-emitting element that emits blue light, a green phosphor that absorbs the blue light and emits green light, and an orange phosphor that absorbs the blue light and emits orange light, and is characterized in that the orange phosphor is an Eu-activated α-SiAlON phosphor having an emission spectrum peak wavelength within a range of 595 to 620 nm.

主权项

1. A lighting device comprising:
a semiconductor light-emitting element for emitting a blue light having a peak wavelength in a range of 420 to 480 nm; and a fluorescent material retainer including:
a first fluorescent material composed of cerium, lutetium, aluminum and oxygen, for absorbing the blue light to emit a light having a first peak wavelength in a range of 500 to 550 nm, anda second fluorescent material composed of europium, silicon, aluminum, oxygen and nitrogen, for absorbing the blue light to emit a light having a second peak wavelength that is longer than the first peak wavelength and is at most 620 nm.