Methods and devices using high efficiency alkaline earth metal thiogallate-based phosphors

摘要

Provided, among other things, is a light emitting device comprising: a light output; a light source producing light including wavelengths of 530 nm or less; and a wavelength transformer located between the light source and the light output, comprising Sr1-xCaxGa2S4:yEu<2+>.zGa2S3, where x is 0.0001 to 1, y is a value defining sufficient Eu<2+> to provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of SrxCa1-xGa2S4, the wavelength transformer effective to increase the light at the light output having wavelength between 535 nm and 560 nm.