Gamut broadened displays with narrow band green phosphors

• Main Authors: Go, Yong Bok, Thomas, Evan, Nordsell, Robert, Baroudi, Kristen, Melman, Jonathan, Bretschneider, Eric, Thomas, Alan C
• Format: Patent
• Language: English
• Published: 08.01.2019
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMISTRY; DEVICES USING STIMULATED EMISSION; DYES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES; SEMICONDUCTOR DEVICES

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.