is the strontium
aluminate type long afterglow phosphor materials. It is made from the rare earth element and aluminate,
chemical formula is SrMgAl4O8:Eu2+Dy3+,
with the H.S code of 3206500000. After absorbing the natural light or lamplight about 15 minutes, the powder can shed continual light with colour of yellow green , blue green or others for longtime. The powder is a non-radioactive, non-toxic and Green-Protection products. It can be used in many transparent or translucent media, such as plastic, paint, glaze, ink, glass and ceramic etc to produce luminous products. With the good indicating and beautifying effect in darkness, the powder can be widely used in emergency signs, passway signs, switches, enamel nameplate, road signs, toys, handicraft, clock, textile, military and camp instruments etc..
◆The photoluminescent pigment will be dissolved in water and decomposed in acid liquid somewhat, so it can not be used in water-solubility and acidity solution. For these purpose, we will produce the waterproof pigments.
◆The smaller the particle size,the lower the luminance is.
◆ Fast light absorbing, high glowing effect and long afterglow time.
◆With better stable characteristic of physics and chemistry, strong acclimatization and long service life.
◆ It is a new type of environmentally friendly photoluminescent pigment with the characteristics of non-toxicity, non-radioactivity, non-flammability and
◆Small particle diameter, granularity distributes equally, easy to produce during process.
Suitable for various kinds of transparent or half transparent medium, such as paint, screen printing, plastic, glass, coating, ink, enamel, ceramic and fiber.
Safety fields: show safety indication effect in fields as below:signs, warning items writing, emergency passenger way, subway station, underground passage, blindage project, hospital, dancing hall, video room, refuge shelter, helmet, bicycle etc.
◆Indication position: can be applied in switch of home appliance, control board, plug, lock, electric torch, stairway, fire protection facility, fire alarm, lifesaving tools etc.
◆Building:can be applied in building wall, tiles, inside surface of elevator, bridge, roads, sea ports etc. both decoration and application value has been achieved.
◆Others: arts and crafts, amber, sand crystal, glass, painting works; toys: plastic toys and piece together pictures; clothing: shoes, caps, working uniform, helmet, transfer pictures, printing graph clothing; calendar, fishing tools.
◆Each type of long-after-glow pigment has its optimal application condition and limits, pls. take a reference of application instruction for long-after-glow pigment or consult technical department.
◆ Most of the photoluminescent pigment are less soluble in water and decomposed in acid, so they can not be used in water-base or acid-base media. For these application, pls use our envelope style pigments. Pls contact us for further details.
◆ Metal material influence the pigment, so prevent pigment from touching metal material.
◆ Mix pigment well before using in terms of its gravity.
◆ Keep pigments in breezy, dry warehouse and make it free from humidity. Pack the rest pigment carefully after one time usage.
earth long after glow in the dark powder knowledge
||REE-activated alkaline earth aluminate, silicate and other high-tech self-luminous products. Their outstanding characteristics are: a variety of visible light absorption at 10 to 20 minutes, you can continue to light at night in the dark more than 12 hours, the luminous brightness and duration is 30 to 50 times the traditional ZnS glow materials.
Glow in the dark powders main technical parameters:
1 initial brightness: glow powder under a certain light brightness (1000LUX), instrumentation brightness value between 0 (typically 3 seconds after the light extinguished) moments. General highlighted photoluminescent powder around 20000-25000. Since the initial rapid reduction sad moment, capturing moments error greater impact on the general brightness with one minute to more appropriate time. Highlight luminous powder is generally 3500 (med/m2) above, in the light powders in 2800, Pu Liang powder at about 2300.
2 persistence: over time, the brightness powder falling, respectively, comparing the luminance values
at different times, to measure the speed of less luminous sorrow. Generally 10 minutes, 30 minutes, one hour brightness for comparison.
3 Granularity: Granularity is an important parameter photoluminescent powder, the application performance of its glow powder has a great influence, generally with an average particle size and particle size distribution to describe the characteristics of the unit is micron (um), these parameters are passed particle analyzer test out. But in reality, in order to facilitate more with 'mesh' (mesh number of single living area) to describe the granularity of the situation, luminous powder is generally based on the production process is divided into -160 mesh, -200 mesh, -250, -300 , -400, -200 to +400 mesh, -160 to +250 mesh and so on. Generally, the same powder quality, the larger the particle size, the better the brightness, the worse the performance; smaller the particle size, the greater the specific surface area, the larger the dispersion in the application area of
the unit area, with the glow powder volume amount will be reduced, to reduce costs.
4 Body color: powder Color.
5 Color: The color of light emitted by the powder.
6 photographic speed: powder to absorb light at a certain saturation of the length of time used to describe short time, sensitive to light, a long time, the photosensitive slow; continued good photosensitive slower. ZnS generally within half a minute can absorb enough light, and photoluminescent powder generally 15 minutes or more.
1.glow in the dark powders of environmentally friendly materials, non-toxic, harmless, non-radioactive, contain 10 kinds of harmful heavy metals, is a safe material.
2 In addition to the red and blue-green powder, other glow in the dark powder is hydrolyzed with water, loss of light emission characteristics, and therefore, when used in aqueous solution, the first luminous powder can be used after waterproofing.
3.photoluminescent pigment temperature resistance: cyan powder highest temperature is generally 8000C or more times in the performance starts to drop, the higher the temperature, the longer the time, the greater the impact (Eu +2 is oxidized continuously Eu +3) , and is irreversible. Yellow-green powder in general began to decline when more than 5000C.
long after glow phosphorescence material
The paper introduces the long after glow phosphorescence material
words: long after glow
to define a luminescent substance it? Suitable materials absorb radiation
energy , and then the light is emitted , the emitted photon energy is
lower than energy of the excitation radiation. This behavior has a
light-emitting substance called luminescent substances. According to the
excitation can be divided into different photoluminescent material , a
cathode ray emitting material , an electroluminescent material , a
chemiluminescent material , etc. . This article deals with
photoluminescent materials are long-lasting light-emitting materials ,
commonly known as luminous materials.
French Sidot finished first ZnS: Cu preparation , the earliest research
work carried out in this series afterglow luminescent materials . Until
the early 20th century, photoluminescent true realization of industrial
production , but also since then, always the ZnS series dominated
afterglow luminescent materials industry . To the 1990s , people began to
discover and concern afterglow luminescent material has good performance
and unique characteristics of the rare earth ion doped afterglow , and
ushered in a maturing super long afterglow materials research and
application of a new era. In recent years, the rare earth ion doped
materials have been widely used in the afterglow instrument display panel
and other areas concealed lighting and emergency lighting, aviation,
marine and automotive , it was the rare earth ion doped materials used in
the preparation of ceramic afterglow .
mechanism of a light-emitting and light-emitting materials
stimulated light materials continue to issue stop is called afterglow .
Called afterglow afterglow afterglow duration time of less than 1 μs
is called ultrashort afterglow called short afterglow ,1-10μs inter
called 10μs-1ms between short afterglow called ,1-100ms between the
afterglow , called the afterglow between 100ms-1s , more than 1s is called
super- long afterglow . Long afterglow luminescent material present
development mechanism is not perfect, are hundreds of gongs state. The
specific mechanism is as follows : After activating agent ( donor ) are
incorporated into the matrix , formed in the band gap near the location of
the conduction band of a series of impurity levels , the role of the trap
from the conduction band movement electrons, it is likely to stay in the
trap for a long time , only in the external force will not be released ;
under excitation photon , electron transitions from the ground state to
the excited activator state ( process 1 ) ; If the electronic ground state
level that is returned directly generate transient luminous phenomena (
process 2 ) is the fluorescence emission ; optical excitation will make
some electronic transitions to the conduction band ( process 3 ) , and
confined in the trap ( procedure 4 ) ; If you are in the trap energy level
of electrons get enough energy e, they will released from the trap
(process 5 ) , which is that they may be re- captured by the trap , it may
transition to the ground state activator ( process 6 ) through the
conduction band , and the light emission center complex , i.e., causing
long afterglow luminescent .
persistence length and the trapping of electrons by the number N and the
energy of these electrons gain on E : N , the more long afterglow time ; E
within a certain range , the more long afterglow time , but can reach the
trap value of the electronic release of all is that it will not help
extend the afterglow of time.
afterglow luminescent material is divided into self-luminous type
photoluminescent afterglow luminescent materials and energy storage . The
former is called a permanent light emitting material , it does not need
the help of any external energy for excitation emitted by the radioisotope
itself containing the particles in the excitation decay due radioisotope
emitted particles is uninterrupted , uniform , stable , so self-luminous
materials can be sustained, steady light, its half-life decay time depends
contained radioisotopes . Initially the use of natural radioactive
elements α particle excitation , and later using synthetic β
-type emission elements to improve the afterglow of a performance and
reduce radiation damage . Latter refers to the people , such as sunlight
or ultraviolet light irradiation short time after the light turned off ,
still can be sustained for a long time luminous materials.
material doped with rare earth ions
the social and economic development, human lifestyles are undergoing
tremendous changes , such as the centralization of human activities,
nightlife extension , increasing the underground construction and
high-rise buildings , while people also enhance awareness of security
risks . Once earthquakes, fires and other unexpected disaster, how to
ensure the safe evacuation of people in the shortest time , that
evacuation signs of how the system can most effectively play a role ,
which is relevant technical experts around the world dedicated to study
and solve major issues . In the conventional ZnS represented since the
light emitting long afterglow luminescent material short time, low
brightness, poor lightfastness shortcomings make it in practice Discard
the dilemma . Developed in the 1990s, rare earth aluminate , silicate
luminescent material , non-toxic , non-radioactive , chemical stability ,
and its luminance and continuous lighting time is 30 to 50 times ZnS as
the representative of the traditional fluorescent material , and unlimited
repeatedly. This efficient photoluminescent green as a precondition to
self-luminous material inventions , marks the third time since the arrival
of the light-emitting materials revolution. In recent years, the
luminescent materials and products were quickly accepted , the amount
present , domestic and foreign carriers using photoluminescent material
fire safety evacuation signs of a thin aluminum sheet products ( printed
luminescent material on which a pattern ) , plastics, rubber , ink, paint,
etc. After processing at room temperature or a lower temperature materials
can be finalized . Compared with the several materials, ceramic materials
with high strength, weather resistance , heat fire-resistant,
water-resistant, easy to clean surface , tastefully decorated , long life
and other advantages. At present, China 's ceramic decorative brick
production has reached more than one billion l0 m2, is widely used in all
kinds of walls, floors and pavement decoration . The advantage of the
advantages of phosphorescent material and ceramic materials ceramic
products rolled into one that gives luminescent features that make more
extensive use of ceramic products , performance luminescent material
products are also more favorable .
, long afterglow luminescent type ceramic become a hot topic all the
scholars , after experimental studies heresy of time, has had promising
results go .
Quansheng and other high-temperature solid phase prepared SrAl2O4: Eu2 +,
Dy3 +, CaAl2O4: Eu2 +, Nd3 +, CaTiO3: Pr3 + long afterglow luminescent
materials , zinc borosilicate system based glazes on ceramic substrate ,
prepared colorful colorful pattern afterglow content luminescent ceramic
glaze ceramic luminescent material was 25% ; ceramic firing temperature of
Xiyan , Lully equality SrAl2O4: Eu2 +, Dy3 + luminescence ceramics in 1250
~ 1450 ℃ to monoclinic crystal. 1400 ℃ sintered samples 4h
glows bright green. Samples high strength, good chemical stability. Is the
center wavelength of the emission spectrum of the broadband spectrum of
520nm , the excitation spectrum is located between 240 ~ 420nm. 10h
-emitting continuous luminance of 2.15 mcd / m2, far higher than the human
eye can distinguish brightness 0.32mcd/m2 minimum luminous decay curves
conform I = At-n, the first 5 min, n = 0.6;. 5 to 40min, n = 1.0; 40 to
600min, n = 1.3 show that the luminescent ceramic afterglow luminance
variation with time is longer decay slower .
pigment production technic process