Light-emitting device

摘要

Disclosed is a light-emitting device (1) including a light-emitting element (2) emitting primary light, and a light converter (3) absorbing a part of the primary light emitted from the light-emitting element (2) and emitting secondary light having a longer wavelength than the primary light. The light converter (3) contains a green light-emitting phosphor (4) and a red light-emitting phosphor (5). The green light-emitting phosphor (4) is composed of at least one phosphor selected from a divalent europium-activated oxynitride phosphor substantially represented by the following formula: EuaSibAlcOdNe and a divalent europium-activated silicate phosphor substantially represented by the following formula: 2(Ba1-f-gMIfEug)O.SiO2, while the red light-emitting phosphor (5) is composed of at least one phosphor selected from tetravalent manganese-activated fluoro-tetravalent metalate phosphors substantially represented by the following formulae: MII2(MIII1-hMnh)F6 and/or MIV(MIII1-hMnh)F6. Consequently, the light-emitting device (1) has excellent color gamut (NTSC ratio).

主权项

1. A light-emitting device comprising:
a light-emitting element for generating a primary light having a peak wavelength of 430 to 480 nm; and a silicone resin covering said light-emitting element and including:
a first phosphor composed of manganese, potassium, fluorine and a tetravalent metal element selected from Ge, Si, Sn, Ti and Zr, a light emitted from said light-emitting device having a spectrum with a red peak wavelength caused by the first phosphor and a blue peak wavelength caused by said light-emitting element, an intensity of the red peak wavelength being larger than an intensity of the blue peak wavelength, anda second phosphor composed of europium, silicon, aluminum, oxygen and nitrogen, the spectrum of the light emitted from said light-emitting device having a green peak wavelength caused by the second phosphor, the intensity of the blue peak wavelength being larger than twice an intensity of the green peak wavelength.