Light emitting device with improved warm-white color point
AssigneeLumileds LLC
InventorsWalter SOER, Hans-Helmut BECHTEL
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Abstract
A light emitting device is disclosed and includes an emission source configured to emit a primary blue light and a wavelength-converting element configured to convert the primary blue light to a secondary light having a correlated color temperature (CCT) in the range of 1600K-2500K and color rendering index (CRI) in the range of 40-60, the wavelength-converting element including a red phosphor material having a peak emission wavelength that is less than 620 nm and a green phosphor material having a peak emission wavelength that is greater than 530 nm. The device may exhibit a melanopic/photopic ratio of less than 0.25 and/or may exhibit a radiometric power fraction of light having a wavelength below 530 nm below 0.1.
Claims20
A light emitting device, comprising:
- an emission source configured to emit a primary blue light;
- and
- a wavelength-converting element configured to convert the primary blue light to a secondary light having a correlated color temperature (CCT) in a range of 1600K-2500K, a melanopic/photopic ratio of less than 0.25, and a color rendering index (CRI) in a range of 40-60, the wavelength-converting element including a red phosphor material having a peak emission wavelength that is less than 620 nm and a green phosphor material having a peak emission wavelength that is greater than 530 nm.
A light emitting device, comprising:
- an emission source configured to emit a primary blue light;
- and
- a wavelength-converting element configured to convert the primary blue light to a secondary light having a correlated color temperature (CCT) in a range of 1600K-2500K, a radiometric power fraction of light having a wavelength below 530 nm below 0.1, and color rendering index (CRI) in a range of 40-60, the wavelength-converting element including a red phosphor material having a peak emission wavelength that is less than 620 nm and a green phosphor material having a peak emission wavelength that is greater than 530 nm.
Dependencies are inferred from the claim text.