The rate of excited state level

So long afterglow time depends on the number of electrons in the trap level and the rate of return excited level , afterglow trap level depends on the intensity of the electron in the unit time to return excited level rate.
This luminous paint luminous paint photoluminescent pigment is dominated by the afterglow luminescent properties of the decision. Rare earth doped alkaline earth aluminate luminous emission time is largely determined by the attenuation characteristics and trap effect decisions. Rare earth doped alkaline earth aluminates attenuation photoluminescent films decay with temperature , the lower the temperature , the weaker intensity , temperature, light intensity increases rapidly , the decay time is much shorter.

luminous paint afterglow luminescent properties

The electron trap level quantity, the long afterglow time ; absorb more energy , the electron is excited to overcome the trap level and energy gap between the energy levels (ET), and thus produce sustained luminescence . Photoluminescent pigment energy continues to increase it will make the afterglow time extension , if enough energy to the electron trap level all the time to return excited state level , is not conducive to the extension of time afterglow ; contrary, absorb very little energy , less so that the electron trap levels returned excited state level , but also long-lasting phenomenon was not observed . So long afterglow time depends on Phosphorescent Ceramic electrons in the trap level and the rate of return excited level , afterglow trap level depends on the intensity of the electron in the unit time to return excited level rate.

Fluorescence stick

Fluorescence stick, outer packaged in polyethylene (plastic), built a glass tube sandwich, sandwich liquid inside and outside respectively peroxide and esters, by bending, hitting, kneading, glow in the dark dye and the glass breakage, causing two compounds reaction resulting in luminescence fluorescent dye.
The principle of the luminescence is that the reaction of peroxide and esters is the reaction of the fluorescence, and the energy transmitted to the fluorescent dyes, and then the fluorescence is emitted by the dyes.. The common market of the fluorescence stick usually placed a glass tube sandwich, masterbatch production sandwich and isolated peroxide and esters, after kneading, two compounds reaction makes fluorescent dye luminescence.

photochromic pigments in China's development

At present, the rapid development of the photochromic pigments, Corfu letter Technology Co., Ltd. Tianjin China photochromic sheets leader, now, technology has been widely used, design clothes, nail polish and other areas. Tianjin Fu Technology Co., Ltd. was established in 2010, beginning the main business of organic photoconductive materials and the development, production and marketing of organic photoconductor drum series. Company to meet the different brands, sizes and types of laser printers, laser fax machines, digital copy and multifunction machines with OPC drum series products successfully developed an organic photoconductive material will be the basis in research, development and production. Early company goal is Tianjin Binhai New Area as a production base for Chemical Engineering, Tianjin University research-based, and strive to build the company in five years to become the leading domestic and world advanced level of professional organic photoconductor drum development center and production base.

Typical of luminous pigment application

Typical of luminous pigment application: suitable for display objects at night and the backings
1. The construction and decoration, interior decoration, lighting, painting, wall.
2. Identification of the night marked goods, power switch, tool or toolbox.
3.PUB, KTV, stores, business establishments and other large gatherings landscaping.
4. traffic signs, fire emergency escape systems, military equipment, garden landscaping.
5. watches, buttons, field instrument or indicator, radios, cameras.
6. bicycle, motorcycle, car, body patterns and aluminum ring, steel.
7. Fishing equipment, aquarium equipment, banners, stickers, toys.
8. luminous sheet General jewelry, stunning picture painted, ceilings landscaping ... etc

fluorescent pigments component structural features

fluorescent pigments are compounds having a specific structure, its structural features are the following three points:
(1), the molecule contains a fluorescing group, such as carbonyl, nitrogen nitrogen double bond, carbon and nitrogen double bond.
(2), containing molecules to help color group. Auxochrome make fluorescence spectral redshifts and increase efficiency, such as primary amine, secondary amine, a hydroxyl group, an ether bond, an amide group.
(3), comprising a rigid planar structure of the molecule of the conjugated π bond. Conjugated molecular systems within the larger plane of stronger fluorescence intensity higher. Some can improve the conjugation of factors that can improve the fluorescence efficiency,photoluminescent pigments and fluorescence wavelength shift to longer wavelengths.

Pigment classified according to chemical composition

fluorescent pigments free now no generally accepted method, the reason is a wide variety of pigments, chemical composition very different purpose is multifaceted, and therefore classified according to which method is not ideal.
More common classification is based on the chemical composition of the pigment will be divided into inorganic and organic pigments. From a performance perspective, inorganic pigments Light, heat resistance, hiding power, but not quite complete chromatography, low tinting strength, bright shade of difference, the larger part of the metal and oxide toxicity. Organic fluorescent pigments manufacturer diverse structure, complete chromatography, bright shade of pure, strong coloring, but the light resistance, weather resistance and poor chemical stability, more expensive.

UV light, sunlight or ordinary light irradiation object

Objects in ultraviolet light, sunlight or ordinary light irradiation, the object has a luminous performance in a dark environment, saying such an object called photoluminescent sheet . Also called long-lasting light-emitting materials and energy storage luminous materials. Their luminous intensity and duration of delay and materials related to the object. There are a variety of photoluminescent pigment, long to see long phosphorescent phosphor and rare earth long afterglow phosphor. Long phosphor is zinc sulfide phosphors and phosphor copper, phosphor such a low cost, but the unstable nature sulfide, deliquescent, aging resistance poor, time is short when other shortcomings. Rare earths long afterglow phosphor is added to the base aluminate phosphor on divalent europium and dysprosium made of long-lasting phosphors, fluorescence delay of up to twelve hours.