VIVID - Red, Green, Yellow LED Phosphor

General Characteristics Physical Characteristics
Name LED Phosphor Body Colour White
Chemical Formula YAG:Ce3+, or Y3Al5O12:Ce3+ Specific Gravity  
Application Delivering white light from an LED to combine a blue “pump” LED source under a layer of phosphor or phosphor blends to achieve the desired spectrum. Particle Size Distribution  
Processing   » fraction £ 1.8 µm  
Suspension Type   » fraction £ 12.5 µm  
Packaging   » fraction £ 25.0 µm  
    Crystal Structure  
Optical Characteristics of Fluorescent - Red, Green, Yellow LED Phosphor
—————— 254 nm excitation —————— —————— C.I.E. Chromaticity Coordinates ——————
» Quantum efficiency   » Powder x = -       Y = -
» UV absorption % » Lamp TLD 36W x = -       Y = -
» Wavelength at peak 550 nm    
» Bandwidth (50%)   —————— Lumen Output 100h TLD (36W) ——————
» Excitation peak - nm » Nominal - lm
Absorption & Emission Spectra Relative Emission using Blue LED Excitation (Reflection Mode)
LED Phosphor Absorption and Emission Spectra
Wavelength (nm)
LED Phosphor Relative Emission using Blue LED Excitation (Reflection Mode)
Wavelength (nm)

VIVID - LED Phosphor

LED Phosphor Some rare-earth doped Sialons are photoluminescent and can serve as phosphors. Europium(II)-doped β-SiAlON absorbs in ultraviolet and visible light spectrum and emits intense broadband visible emission. Its luminance and color does not change significantly with temperature, due to the temperature-stable crystal structure. It has a great potential as a green down-conversion phosphor for white LEDs; a yellow variant also exists. For white LEDs, a blue LED is used with a yellow phosphor, or with a green and yellow SiAlON phosphor and a red CaAlSiN3-based (CASN) phosphor.

White LEDs can also be made by coating near ultraviolet (NUV) emitting LEDs with a mixture of high efficiency europium based red and blue emitting phosphors plus green emitting copper and aluminium doped zinc sulfide (ZnS:Cu,Al). This is a method analogous to the way fluorescent lamps work.

Some newer white LEDs use a yellow and blue emitter in series, to approximate white; this technology is used in some Motorola phones such as the Blackberry as well as LED lighting and the original version stacked emitters by using GaN on SiC on InGaP but was later found to fracture at higher drive currents.

Many white LEDs used in general lighting systems can be used for data transfer, for example, in systems that modulate the LED to act as a beacon

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