US Patent 10177287 Gamut broadened displays with narrow band green phosphors

Phosphors emitting green light over a narrow wavelength range may be used to broaden the gamut of display devices. In one aspect, a light emitting device comprises a light emitting solid state device emitting blue or violet light, a first phosphor that absorbs blue or violet light emitted by the light emitting solid state device and in response emits green light in a spectral band having a peak at wavelength λG and a height of one half its peak on a long wavelength edge of the band at wavelength λGhalf; and a second phosphor that absorbs blue or violet light emitted by the light emitting solid state device and in response emits red light in a spectral band having a peak at wavelength λR and a height of one half its peak on a short wavelength edge of the band at wavelength λRhalf. The ratio (λRhalf−λGhalf)/(λR−λG) is greater than 0.70.