Lamp,PDP,CRT,PRT,VFD,CCFL, Fluorescent powder for Lamp,PDP,CRT,PRT,VFD,CCFL
1600 Ton/Tons per Year
Packaging & Delivery
2Kg/Bag or 5Kg/Bag; 20Kg/Drum; or customer-specific package
1.in-house raw material suppy
3.export volume No.1 in China
4.acquisition of ZOX under MCC(Japan)
Fluorescent powder available from us
1. Red fluorescent powder
2. Green fluorescent powder
3. Blue fluorescent powder
4. Mixed fluorescent powder
Fluorescent Powder degradation
Many florescent powder tend to lose efficiency gradually by several mechanisms. The activators can undergo change of valence (usually oxidation), thecrystal lattice degrades, atoms – often the activators – diffuse through the material, the surface undergoes chemical reactions with the environment with consequent loss of efficiency or buildup of a layer absorbing either the exciting or the radiated energy, etc.
The degradation of electroluminescent devices depends on frequency of driving current, the luminance level, and temperature; moisture impairs fluorescent powder lifetime very noticeably as well.
Materials for Fluorescent powder
Fluorescent powder are usually made from a suitable host material with an added activator. The best known type is a copper-activated zinc sulfide and the silver-activated zinc sulfide (zinc sulfide silver).
Many fluorescent powders are produced in low-temperature processes, such as sol-gel and usually require post-annealing at temperatures of ~1000 °C, which is undesirable for many applications. However, proper optimization of the growth process allows to avoid the annealing.
Fluorescent powder used for fluorescent lamps requires a multi-step production process, with details that vary depending on the particular fluorescent powder. Bulk material must be milled to obtain a desired particle size range, since large particles produce a poor quality lamp coating and small particles produce less light and degrade more quickly. During the firing of the fluorescent powder, process conditions must be controlled to prevent oxidation of the phosphor activators or contamination from the process vessels. After milling the fluorescent powder may be washed to remove minor excess of activator elements. Volatile elements must not be allowed to escape during processing. Lamp manufacturers have changed composition of fluorescent powder to eliminate some toxic elements, such as beryllium, cadmium, or thallium, formerly used.
The commonly quoted parameters for fluorescent powder are the wavelength of emission maximum (in nanometers, or alternatively color temperature in kelvins for white blends), the peak width (in nanometers at 50% of intensity), and decay time (in seconds).
Fluorescent powder, also called phosphor, most generally, is a substance that exhibits the phenomenon of luminescence. Somewhat confusingly, this includes both phosphorescent materials, which show a slow decay in brightness (> 1 ms), and fluorescent materials, where the emission decay takes place over tens of nanoseconds. Phosphorescent materials are known for their use in radar screens and glow-in-the-dark toys, whereas fluorescent materials are common in cathode ray tube (CRT) and plasma video display screens, sensors, and white LEDs.
Fluorescent powder are often transition metal compounds or rare earth compounds of various types. The most common uses of fluorescent powder are in CRT(cathode ray tube) displays and fluorescent lights. CRT fluorescent powder were standardized beginning around World War II and designated by the letter "P" followed by a number.Phosphorus, the chemical element named for its light-emitting behavior, emits light due tochemiluminescence, not phosphorescence.Fluorescent powder is also used for other applications like phosphor thermometry,glow-in-the-dark toys,