Light emitting device
AssigneeSeoul Semiconductor Co., Ltd.
InventorsMyung Jin Kim, Kwang Yong Oh, Ki Bum Nam, Ji Youn Oh, Sang Shin Park, Michael Lim
Life of this patent
Estimating the term…
Abstract
A light emitting diode package including: a housing; a light emitting diode chip arranged in the housing; a wavelength conversion unit arranged on the light emitting diode chip; a first fluorescent substance distributed inside the wavelength conversion unit and emitting light having a peak wavelength in the cyan wavelength band; and a second fluorescent substance distributed inside the wavelength conversion unit and emitting light having a peak wavelength in the red wavelength band, wherein the peak wavelength of light emitted from the light emitting diode chip is located within a range of 415 nm to 430 nm.
Claims17
A white light emitting device, comprising:
- a housing including an inclined inner wall and a substrate including a mounting region;
- a light emitting diode chip mounted on the mounting region and configured to emit light having a peak wavelength in a blue wavelength band;
- a wavelength converter disposed on the light emitting diode chip;
- a first phosphor distributed in the wavelength converter and configured to emit light having a peak wavelength in a range from 520 nm to 550 nm;
- a second phosphor distributed in the wavelength converter and configured to emit light having a peak wavelength in a range from 600 nm to 660 nm;
- a third phosphor distributed in the wavelength converter and configured to emit light having a longer peak wavelength than that of the light emitting diode chip thereof;
- and
- a reflector disposed on the substrate and configured to reflect light emitted from the light emitting diode chip and the first, second, and third phosphors,
- wherein:
- the first phosphor is irregularly dispersed in the wavelength converter and emits a first light including a green color range;
- the second phosphor is irregularly dispersed in the wavelength converter and emits a second light including a red color range;
- the wavelength converter has a roughened region;
- a white light is configured to be formed by a synthesis of light emitted from the light emitting diode chip, the first light, the second light, and the third light,
- the second phosphor includes a phosphor represented by A2MF6:Mn, wherein A is any one selected from the group consisting of Li, Na, K, Rb, Ce, and NH4, and M is any one selected from the group consisting of Si, Ti, Nb, and Ta, and
- the white light has an R9 of 50 or higher.
A white light emitting device, comprising:
- a housing including an inclined inner wall and a mounting region;
- a light emitting diode chip mounted on the mounting region and configured to emit light having a peak wavelength in a blue wavelength band;
- a wavelength converter disposed on the light emitting diode chip;
- a first phosphor distributed in the wavelength converter and configured to emit light having a peak wavelength in a green wavelength band;
- and
- a second phosphor distributed in the wavelength converter and configured to emit light having a peak wavelength in a red wavelength band;
- wherein:
- the first phosphor includes a green phosphor;
- the second phosphor includes a first red phosphor and a second red phosphor formed of different materials;
- the wavelength converter has a roughened region;
- a white light is configured to be formed by a synthesis of light emitted from the light emitting diode chip, the first phosphor, the first red phosphor, and the second red phosphor,
- the first red phosphor includes a phosphor represented by A2MF6:Mn, wherein A is any one selected from the group consisting of Li, Na, K, Rb, Ce, and NH4, and M is any one selected from the group consisting of Si, Ti, Nb, and Ta, and
- the white light has an R9 of 50 or higher.
Dependencies are inferred from the claim text.