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US 11,634,630 B2Granted
Phosphor and light source device
AssigneeTDK Corporation
InventorsTatsuya Terui, Masato Sato
Life of this patent
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Abstract
A phosphor and a light source device having the phosphor having a high internal quantum yield by enabling a large Ce amount, capable of shifting the fluorescence wavelength of yellow fluorescence to the long wavelength side, having satisfactory heat quenching resistance, and excellent in blue light transmittance. The phosphor includes a Ce:YAG single crystal having a Ce amount of 0.7 parts by mole or more when the total amount of Y and Ce is 100 parts by mole.
Claims9
A phosphor comprising a Ce:YAG single crystal having a Ce amount of 0.7 parts by mole or more in which a total amount of Y and Ce is 100 parts by mole,
- wherein a relative value (%) of an internal quantum yield at 200° C. with respect to an internal quantum yield at 25° C. by blue light of 450 nm is 95% or more.
Dependencies are inferred from the claim text.