GAMUT BROADENED DISPLAYS WITH NARROW BAND GREEN PHOSPHORS

• Main Authors: MELMAN, Jonathan, NORDSELL, Robert, BRETSCHNEIDER, Eric, THOMAS, Alan C, GO, Yong Bok, THOMAS, Evan, BAROUDI, Kristen
• Format: Patent
• Language: English; French; German
• Published: 29.07.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; 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.