NAVIGATION
-
Products
-
Nanomaterials
- Carbon Nanomaterials
- Ceramic Membranes
- Dendrimers
- Graphenes
- Mesoporous Materials
- Molecular sieve
- MXenes Materials
- Nanoclays
- Nanodiamonds
- Nanodispersions
- Nanoparticles
- Nanopowders
- Nanotubes
- Nanowires
- Polymer Nanospheres
- POSS Nanohybrid Materials
- Quantum Dots
- Surface Functionalized Nanoparticles
- Tectomers
- Zeolites
-
Organic and Printed Electronics
- Battery Materials
- Dye-Sensitized Solar Cell (DSSC) Materials
- Electroluminescence Materials
- Electronic Materials
- Liquid Crystal (LC) Materials
- Molecular Conductors
- Organic Field Effect Transistor (OFET) Materials
- Organic Light-Emitting Diode (OLED) Materials
- Organic Semiconductors
- Organic Solar Cell (OPV) Materials
- Perovskite Solar Cell (PSC) Materials
- Printed Electronic Materials
- Self Assembly and Contact Printing Materials
- Solution Deposition Precursors
- Sublimed Materials
- Substrates and Electrode Materials
- Synthetic Tools and Reagents
- Vapor Deposition Precursors
- Other Electronic Materials
- Polymer Science
-
Biomaterials
- Biocompatible Ceramics
- Biodegradable Polymers
- Bioelectronic Materials
- Crosslinkers
- Hydrogels and Crosslinked Polymers
- Hydrophilic Polymers
- Hydrophobic Polymers
- Natural Polymers and Biopolymers
- Oligonucleotide Polymers and Copolymers
- PEG-PPG Copolymers
- Poly(ethylene glycol) and Poly(ethylene oxide)
- Polyamino Acids
- Polysaccharide
- Self-Assembly Materials
- Resins
- Photonic and Optical Materials
- Alternative Energy
- Metals and Materials
- Functional Materials
- Foam Materials
- Micro-Nano Electric Materials
- Material Building Blocks
- Glass and Ceramics
- Magnetic Materials
- Food Grade Materials
- 3D Printing Materials
- Others
-
Nanomaterials
Phosphors - Phosphor Materials
Phosphor, commonly known as luminous powder, is usually divided into light-induced energy-storing luminous powder and radioactive luminous powder. Light-induced energy-storing luminous powder refers to phosphor that stores the light energy after being irradiated by natural light, sunlight, ultraviolet light and so on, and then slowly releases the light energy in the form of fluorescence after stopping the light irradiation. Therefore, the phosphor can still be seen glowing at night or in the dark, and can last for several hours to more than ten hours. Phosphors usually contain various types of transition metals or rare earth compounds. Phosphorescent materials are commonly used in CRT and plasma displays, fluorescent lamps, sensors and white LEDs.
Figure 1. The luminous principle of white LED
Applications:
- Phosphor for ordinary fluorescent lamps and low-pressure mercury lamps: Fluorescent powders used in fluorescent lamps and low-pressure mercury lamps include antimony, manganese activated calcium halophosphate phosphors and rare earth tricolor phosphors. Antimony and manganese activated calcium halophosphate phosphors are prepared by adding a small amount of antimony (Sb) and manganese (Mn) into fluorochlorapatite matrix 3Ca3(PO4)2Ca(F,Cl)2 as activators. When the activator Sb absorbs the excitation energy and releases part of the energy in the form of light radiation, calcium halophosphate phosphors with different color temperatures can be obtained by changing the content of Mn. Among the rare earth tricolor phosphors, the red powder is europium activated yttrium oxide (Y2O3: Eu), the green powder is cerium and terbium activated aluminate (MgAl11O19: Ce, Tb), and the blue powder is low-valent europium activated barium magnesium aluminate (BaMg2Al16O27: Eu).
- Phosphor for high-pressure mercury lamps: The spectral distribution of high-pressure mercury lamp is significantly different from that of low-pressure mercury lamp (fluorescent lamp). In order to improve the efficiency and color of the lamp, the glass shell outside the discharge tube of the high-pressure mercury lamp is coated with phosphor to convert the energy of ultraviolet radiation with a wavelength of 365nm into visible light. In the early stages, manganese-activated magnesium fluorogermanate or tin-activated zinc strontium phosphate powder was used in high-pressure mercury lamp. Later, Y(PV)O4: Eu phosphor has been developed, which is more suitable for high-pressure mercury lamp. The phosphor YVO4: Eu, used for color TV has a peak value of 619nm, and the lamp using YVO4:Eu has high total luminous flux and good color rendering performance.
- Phosphor for ultraviolet light source: This phosphor can produce another kind of ultraviolet with longer wavelength under the excitation of ultraviolet with a wavelength of 253.7nm or other shorter wavelengths. There are many types of phosphors used as ultraviolet light sources. (BaSi2O3:Pb) phosphor is an effective ultraviolet phosphor with a peak value of 350nm, which is used as a black light to trap and kill insect pests. Calcium orthophosphate ((Ca,Zn)3(PO4)2:Ti) phosphor is a kind of high-efficiency powder for lamp with emission wavelength of 280nm and 350nm and the peak value is 310nm. The photocopy lamp must have spectral lines that match the absorptivity of the photosensor or photoelectric surface used, so strontium pyrophosphate (Sr2P2O7: Eu), magnesium gallium gallate (MgGa2O4: Mn), zinc silicate (Zn2SiO4: Mn) and other ultraviolet phosphors are used in diazo photocopying lamps.
Figure 2. Phosphors of different colors
References:
- MEI Y, JIA Y C, YOU H P, et al. (2010) "Synthesis and luminescent properties of NaLa(MoO4)Z: Eu3+ shuttle-fike nanorods composed of via nanoparticles." CrystEngComm, 13:4046-4052.
- HAQUE M M, LEE H I, KIM D K (2009). "Luminescent properties of Eu3+-activated molybdate-based novel red-emitting phosphors for LEDs".J. Alloys Comp.481:792-796.
Quick Inquiry
Products
Alternative Energy
Micro-Nano Electric Materials
Nanomaterials
Organic and Printed Electronics
Photonic and Optical Materials
Polymer Science
Share
Interested in our Services & Products? Need detailed information?
