Garnet silicate, garnet silicate phosphor, and wavelength converter and light emitting device which use the garnet silicate phosphor
Garnet silicate is garnet silicate containing, as a main component, silicate represented by a general formula: Lu 2 CaMg 2 (SiO 4 ) 3 . The garnet silicate includes primary particles having a particle shape derived from a crystal structure of garnet. Moreover, the garnet silicate further contains alkaline metal including at least lithium, in which a content of the alkaline metal is less than 2000 ppm. The garnet silicate phosphor includes garnet silicate and ions which are included in the garnet silicate and function as a light emission center. The wavelength converter includes the garnet silicate phosphor. A light emitting device includes the garnet silicate phosphor or the wavelength converter.
1. Garnet silicate containing, as a main component, silicate represented by a general formula: Lu 2 CaMg 2 (SiO 4 ) 3 , comprising:
primary particles having a particle shape derived from a crystal structure of garnet,
wherein the garnet silicate contains alkaline metal including at least lithium, in which a content of the alkaline metal is less than 2000 ppm.
2. The garnet silicate according to claim 1 , wherein an average particle size is 3 μm or more.
3. A garnet silicate phosphor comprising:
the garnet silicate according to claim 1 ; and
ions which are included in the garnet silicate and function as a light emission center.
4. The garnet silicate phosphor according to claim 3 , wherein the ions are Ce 3+ .
5. A wavelength converter comprising the garnet silicate phosphor according to claim 3 .
6. A light emitting device comprising the garnet silicate phosphor according to claim 3 .
7. The light emitting device according to claim 6 , further comprising:
as an excitation source, a light emitting element that emits blue light having a peak within a wavelength range of 440 nm or more and less than 475 nm,
wherein the blue light excites the garnet silicate phosphor.
8. The light emitting device according to claim 6 , wherein a fluorescent component emitted by the garnet silicate phosphor is used as illumination light or a display pixel.