LED Phosphors

White light as chemistry

LED phosphors are a crucial material in the manufacture of white LEDs. Phosphor chemistry and composition largely determine an LED’s efficiency, light quality and stability. At our subsidiary Nakamura Yuji, a joint venture with investment from Mitsubishi Chemical Corporation, we understand phosphor technology at a fundamental chemical level, allowing us to pursue the best chemical formulations and manufacturing processes that result in the highest quality. Yuji is one of the very few LED companies in the world that has entire LED phosphors and packaging technologies. Multi-variety LED phosphors are the basis for YUJILEDS spectrum simulation.

High brightness, high stability

Despite a seemingly ubiquitous LED market, high brightness and stability are difficult to come by, particularly for high CRI LED products. Our consistent focus on improving the brightness and stability of red nitride phosphors has allowed us to become an industry leader in providing high CRI LEDs at efficiency levels and stability in line with standard CRI level LEDs on the market.

Selected phosphor

UV phosphor

UV phosphor can be effectively excited by a UV chip with an emission peak wavelength in the 250-350nm range. The main application of UV phosphor is to replace 260nm low pressure mercury lamp, to realize sterilization and skin disease treatment.

Phosphate LED phosphor

Phosphate LED phosphor can be effectively excited by a 400nm violet LED chip with an emission peak wavelength in the 445-475nm range. Combined with β-SiAlON green phosphor and nitride red phosphor, a full spectrum white light with R1-R15 all above 90 can be achieved.

YAG LED phosphor

Yttrium Aluminum Garnet LED phosphor is efficient and suitable for creating high correlated color temperature (CCT). Absorption peaks at 450 nm, and dominant emission wavelengths range from 540-560nm.
YAG LED phosphors can be effectively excited by a 450nm blue LED chip with an emission peak wavelength in the 540-560nm range. It is mainly used for increasing luminous efficiency. By adding a small amount of YAG yellow phosphor to an Ra80 LED, the luminous flux will increase dramatically.

LuAG LED phosphor

Lutetium Aluminum Garnet LED phosphor offers comparable performance to YAG phosphors. We offer LuAG phosphor with dominant emission wavelengths ranging from 520nm to 540 nm. It is generally used in conjunction with red phosphors for high CRI full spectrum coverage. LuAG LED phosphor can be effectively excited by a 450nm blue LED chip with an emission peak wavelength in the 510-540nm range. Combined with nitride red phosphor, a high CRI spectrum with Ra above 95 can be achieved.

Nitride red LED phosphor

Nitride LED phosphor is crucial for high CRI and low correlated color temperature (CCT) white LEDs. Dominant emission wavelengths range from 605 nm to 660 nm. It can also be applied in plant growth light LEDs where wide and stable red spectrum coverage is required. nitride red LED phosphor can be effectively excited by 400nm-460nm violet LED or blue LED with an emission peak wavelength in the 600-660nm range. When combined with blue LED chip and aluminosilicate green phosphor, it can produce a white LED light with Ra 95 or above. With violet LED chip, phosphate blue phosphor and β-SiAlON green phosphor, a full spectrum of white light with R1-R15 all above 95 can be achieved.

Oxynitride LED phosphor

LED Oxynitride phosphor can be used to package high CRI LEDs which require full spectrum coverage. Dominant emission wavelengths range from 500nm to 650nm.

Nitride green LED phosphor

Nitride green LED phosphor can be effectively excited by a 400-460nm violet or blue LED chip, emitting in the range of peak wavelength 525-545nm, full width at half maxima (FWHM) < 60nm with high color purity. Excited by a blue LED chip, combined with β-SiAlON green phosphor in a backlight, NTSC can be improved to above 100%. Excited by a violet LED chip, combined with phosphate blue phosphor and nitride red phosphor, a full spectrum of white light with R1-R15 all above 90 can be achieved.

KSF phosphor

KSF LED phosphor can be effectively excited by a 460nm blue LED chip with a strongest emission peak wavelength at near 631nm, full width at half maxima (FWHM) < 60nm with comparatively high color purity. Combined with β-SiAlON green phosphor for a backlight, NTSC can be improved to above 100%.

Infrared LED phosphor

Infrared LED phosphor can be excited by a 450-460nm blue LED chip with an emission peak in the 710-730nm range. It can be used in plant growth light. Combined with blue light (460nm) + red light (660nm) + near-infrared light (730 nm), the plant growth, especially the radial growth can be regulated and improved.