White light emitting device
A white light emitting device includes a structure for emitting white light having at least four wavelengths by using two or less LEDs, where the LEDs include a blue/green LED emitting blue and green wavelengths of light. The device also includes means for emitting red wavelength of light.
1 . A white light emitting device comprising: a structure for emitting white light having at least four wavelengths by using two or less light emitting diodes (LEDs),
wherein the LEDs comprise a blue/green LED emitting blue and green wavelengths of light; and
the device comprising red light emitting means.
2 . The white light emitting device according to claim 1 , wherein the blue/green LED comprises an InGaN-based LED.
3 . The white light emitting device according to claim 1 , wherein the red light emitting means comprises an InGaAlP-based LED.
4 . The white light emitting device according to claim 1 , wherein the red light emitting means comprises red phosphor.
5 . The white light emitting device according to claim 1 , wherein the red light emitting means comprises a red Photon Recycling System (PRS).
6 . The white light emitting device according to claim 1 , the white light has a light emission spectrum with a blue peak wavelength in the range of 440 to 470 nm, and a green peak wavelength in the range of 500 to 530 nm, a yellow peak wavelength in the range of 560 to 580 nm and a red peak wavelength in the range of 620 to 640 nm.
7 . The white light emitting device according to claim 1 , the white light has a light emission spectrum with a blue peak wavelength in the range of 450 to 460 nm, a green peak wavelength in the range of 505 to 515 nm, and a yellow peak wavelength in the range of 565 to 575 nm, and a red peak wavelength in the range of 630 to 640 nm.
8 . The white light emitting device according to claim 7 , the white light has a color rendering index of at least 95.
9 . The white light emitting device according to claim 1 , further comprising yellow phosphor,
wherein the red light emitting means comprises at least one selected from a group consisting of a red LED, a red PRS and red phosphor.
10 . The white light emitting device according to claim 9 , wherein the yellow phosphor has a peak wavelength in the range of 540 to 590 nm.
11 . The white light emitting device according to claim 1 , wherein the red light emitting means comprises an amber/red LED emitting amber and red wavelengths of light.
12 . The white light emitting device according to claim 1 , wherein the blue/green LED is adapted to emit amber wavelength of light along with blue and green wavelengths of light, and
the red light emitting means comprises a red LED emitting red wavelength of light.