PHOSPHORESCENT PIGMENTS

INTRODUCTION:


Our Phosphorescent pigments are a new type of long persistence phosphorescent pigment of alkaline earth aluminate activated by rare earth ions. The main characteristic of this material is the particular structure of its crystal with the strong capacity of absorbing-storing-emitting light. After absorbing varieties of visible lights (suitable for common light in room), it can glow for more than twelve hours in the dark. The brightness and length of persistence time are more tens times than those of the conventional phosphor of zinc sulfide. The material itself has nontoxic and harmless and free from any radioactive additives. It has good stability and weatherability. Excitation and emission can be repeated indefinitely.

APPLICATION:


The new type of pigment is used for many very different technical and artistic purposes due to its characteristics. It can be used in manufacturing paint; ink; plastic; rubber and films etc. It is completely safe for the application in consumer products such as clothing; shoes; caps; toys; stationery goods; watch; switch; novelties; fishing tools and sporting goods. It has good effects in the fields of building; decoration; traffic vehicle; military installations; fire emergency system. It is especially suitable for the production of long afterglow safety products such as warning; mandatory and escape-route signs.

TECHNICAL SPECIFICATION:


Appearance : light yellow; light green; red; blue; yellow; green
Glowcolor : yellow-green; blue-green; red; blue; yellow; green
Decay Time : up to 12 hours after absorbing the light for 10 - 30 minutes
Density : 3.5+/-O. 1 g/cm3
Particle Size : 10 - 65 um
Moisture : 0.5 %
Continuity : the luminosity is over 5 years

MSDS:


Our pigments are certified free from any radioactive additives.

Description Appearance Glowing color Model Average size (um)
Daytime Night
PL Series Pigments Purple Purple PLP-7 30-50
Light-Yellow Yellow-Green PLO-6
PLO-7
PLO-8
B: 45-65
C: 20-40
D: 10-15
E: 5-10
F: 2-5
Light-Green Blue-Green PLB-6
PLB-7
B: 45-65
C: 20-40
D: 10-15
E: 5-10
S Series Pigments Yellow-Green Blue-Green LBG-101 25-45
Yellow-Green Yellow-Green LG-101 25-45
Light-green Blue-green SBG-8 B: 45-65
C: 20-40
Light-white Blue SB-8 B: 45-65
C: 20-40
Light-White
Light-Yellow
Yellow-Green
Yellow-Green S-2
S-3
S-4
2: 15-26
3: 45-60
4: 20-40
R Series Pigments Red Red RR-7 20-50
Orange Orange-red RO-7 20-50
White Red REO-1 15-40

Characteristics:

  1. PL series of photoluminescent pigment is made of alkaline earth aluminate. With appearance of light yellow, its glowing color can be yellow-green and blue-green, after absorbing visible light, especially those of short waves beneath 450nm, PL series of pigment can glow for more than 20 hours in the dark.
  2. Absorbing light speedily and emiting light in gay colors, R series of photoluminescent pigment can be used not only as pigment in day, but also with luminous effect in night. Its appearances are red, orange, yellow and glowing colors are red, orange-red, orange-yellow.
  3. With good water resistance property and better stability and strong capacity of absorbing short waves beneath 450nm, especially suitable for water-base medium, S series of photoluminescent pigment can give out blue, blue--green, green and yellow light.
  4. M series of photoluminescent pigment presents gay appearance colors with blue, green, yellow and red. It can be used not only in day but also with luminous effect in night.

LONG AFTERGLOW PHOTOLUMINESCENT PIGMENT

  1. Introduction:

    LUMI. long afterglow photoluminescent pigment (LM) is a new type of long decay phosphor for alkaline earth aluminate activated by rare earth ions. It has ten times brightness and glowing time than those of the traditional phosphor of zinc sulfide. It could last emitting for the whole night after low density light (200LX). The emission density could be upgraded with lighting enhance and it also could be excited by the light of UV, the sun fluorescent. The product itself is nontoxic and harmless and free from any radioactive additives. It has good stability and weatherability. Excitation and emission can be repeated, and its property at same time is almost no declined.

    LM was granted a China patent in 1992 after over ten years of research. Now our products have been exported to and distributed in quite a few countries and regions such as USA, Japan, Korea, Canada, Singapore and etc.

  2. Application:

    The new type of pigment is used for many very different technical and artistic purposes due to its characteristics. It can be used in manufacturing paint, ink, plastic, rubber and film etc. It is completely safe for the application in consumer products such as clothing, shoes, caps, fields of building, decorating, traffic vehicle, military installations, fire emergency system. It is specially suitable for the production of long afterglow safety products such as warning, mandatory and escape route signs.

  3. Comparison of LM with conventional phosphorescent pigments
Name LM Conventional
Chemical Identity Alkaline Earth Aluminate ZnS:Cu
Body Color Light Yellow-Green Yellow-Green
Av. Particle Size (um) 45-65 40-50
Excitation Energy(nm) 200-450 200-450
Emission Wave Length (nm) 520 530
Afterglow Brightness(1) (mcd/m2) 340 16
Afterglow Extinction(2) (min) 2000 About 200
Excitation Time(3)(min) 10 10
Light Fastness > 1000 hours 100hr diminish 65%
1000hr diminish to zero
Chemical Stability Excellent Poor to Good
Specific Gravity 3.6g/cm3 4.1g/cm3

Note:
  1. Brightness after 10min, excitation with a D65 illuminant for 10min at 1000LX.
  2. Time span necessary for afterglow brightness to diminish to 0.32mcd/M2.
  3. Time required for saturation with standard D6.5 illuminant at 1000LX.
  4. Features and Properties of LM:
  • Brightness and Emission Color

    The pigment is exposed under direct ultra violet rays (UV) from the sun, black lamps, halogen lamps, discharge lamps and other light sources which are rich in UV light, it can emit the yellow-green light.

  • Light Fastness

    LM and a ZnS:Cu based phosphorescent pigment were tested for light fastness as described below, and the results are shown in the following table.

    Test samples were irradiated with a standard light source (300W Mercury Lamp) for 1000hr, under the conditions of temperature = 38-4OoC and humidity--80%.
Photoluminescent Pigment Relative Afterglow
Unexposed 10hr 100hr 300hr 1000hr
LM 100 98 98 97 97
ZnS:Cu 100 86 35 0 0
  • Afterglow Characteristics

    It was excited with a D6.5 light source at 1000LX for 10 minutes. The emission is 340mcd/M2 at 10 min, 55mcd/m2 respectively. Its time is over 2000 minutes. Lumi. is TEN TIMES BRIGHTER and has over ten times afterglow of ZnS:Cu based pigment.

  • Effect of Light Source on Afterglow Brightness

    LM's afterglow brightness increases with increase in light Source intensity, whereas the classical phosphorescent pigments reach a plateau around 300 Lux light intensity.

  • Effect of Excitation Time on Afterglow Brightness

    LM shows a much higher capacity of absorbing and storing light energy compared to classical phosphorescent pigment.

Application of Photoluminescent Pigment

In Paint, Ink and Plastic


LM may be used in all types of paint, powder coatings, silk-screen ink, enamels, plastics and even porcelain. As the pigment has a slight solubility in water, the only unsuitable are aqueous ones. For optimum performance the following suggestions should be careful:

  • Paints & Coatings
  1. Use a transparent solvent -vehicle with natural or alkaline PH
  2. Do not grind the pigment, just stir. If possible use light colored ceramic or glass lined vessels.
  3. Shelf life depends on the moisture content of the vehicle, if moisture is present, shelf life is diminished. Although solvent based paints do not contain moisture, some of them might absorb ambient moisture. Therefore take precautions to minimize this from happening.
  4. To minimize settling, use a viscous vehicle or anti-settling agents. Stir well prior to application.
  5. Apply a white base coat under the phosphorescent layer to improve afterglow.
  6. Apply a clear overcoat to protect the pigment from humidity and to improve gross.
  7. All additions should be free of heavy metal compounds.
  8. Plan on using 20 to 60 percent pigment (by weight)
  • Inks: Silk Screen &UV cured
  1. Viscosity of inks should be about 3000-5000 poise. During printing viscosity should be adjusted by using a diluting agent based on printing speed.
  2. Apply a white base coat under the phosphorescent layer to improve afterglow.
  3. Minimum film thickness of the LM layer should be 100 um. In order to achieve maximum afterglow, a film thickness of 130-150um is required. For achieving this thickness two passes may be necessary.
  4. Ideal screen size would be 80-100 mesh. Larger screen openings would give better results.
  5. To minimize settling, use a viscous vehicle and/or anti-settling agents. Also stir well prior to printing.
  6. One kilogram of dry LM can cover 3.5 square meter area.
  7. It is important to keep the entire system dry!
  • Plastics
  1. LM is compatible with acrylic, polyester, epoxy, pvc, polypropylene and polyethylene (HDPE, LDPE etc.) polymers.
  2. Material can be cast, dipped, coated, extruded or molded.
    • Preferably use master batches or compounds for incorporating LM into plastics. As LM is a very hard substance and the particles have a needle like shape, it is difficult to incorporate into plastic resins directly.
    • It is recommended to use an extruding temperature as low as possible.
    • Master batches containing LM must be fully dried up before usage.
  3. Plan on using less than classical phosphorescent pigment loadings.
GTA LLC - P.O. Box 15172, Scottsdale, Arizona 85267 - eMail: goods@gtamart.com Copyright © 2010, GTA LLC