Semiconductor Light Emitting Devices Including Red Phosphors that Exhibit Good Color Rendering Properties and Related Red Phosphors

摘要

A light emitting device includes a light emitting diode (“LED”) that emits light having a dominant wavelength in the blue color range, and a recipient luminophoric medium that is configured to down-convert at least some of the light emitted by the LED. The recipient luminophoric medium includes a green phosphor that down-converts the radiation emitted by the LED to radiation having a peak wavelength that is between about 525 nanometers and about 550 nanometers, a yellow phosphor having a wavelength peak that is between about 550 nanometers and about 580 nanometers, and a red (Ca_1-x-ySr_xEu²⁺_y)SiAlN₃ phosphor. The (Ca_1-x-ySr_xEu²⁺_y)SiAlN₃ phosphor has a europium content y of between about 0.003 and 0.009 and a strontium content x of between about 0.150 and 0.300.