What is photoluminescence?
Same with reflective materials?
Is LightLead's PL pigment GREEN, safe?
How does LightLead's PL pigment work?
What lights are best to charge?
LightLead's pigment and how long does it take to charge?
How bright and long does LightLead's pigments actually glow?
Will it replace traditional electrical emergency lighting?
May I use PL material outdoors?
Water/high moisture condition?
Heat resistance?
 
 

Part I - About photoluminescent techniques

Q1:What is photoluminescence? Top

A1 : Photoluminescence is a special kind of luminescence, which can absorb light energy then release the energy in light, mostly abbreviated as PL. It covers any material containing phosphors that will absorb light energy and then release that energy in the form of light.
 In a simple word, photoluminescent is a kind of light-lead lighting, different to electronic-lead lighting(LED) or chemical-lead lighting.
 There are two types of photoluminescence: fluorescence and phosphorescence.
 Fluorescent materials absorb light and then emit light instantaneously under condition of no continuous energy supplying, short as to 10-8 second and unable to distinguish by human eyes. They are commonly seen in a TV screen or computer monitor.
Phosphorescent materials absorb and store light, then emit visible light slowly over time. There are many glow-in-the-dark products containing phosphorescent materials in the market nowadays, from mobile phone covers to toys. If you have ever seen any of these products, you know that they all have to be "charged", sounds like a storage battery. You hold them up to a visible or UV light for a few minutes, and then take them to a dark place where they glow for several hours.

 
Q2: Same with reflective materials? Top
A2: No. LightLeadĄ¯s photoluminescent materials differ from reflective materials, which amplify and increase relative brightness when light is applied. LightLeadĄ¯s photoluminescent materials require prior exposure to a light source before its glowing in the dark.
 
Q3: Is LightLeadĄ¯s PL pigment GREEN, safe? Top

A3: Yes. LightLeadĄ¯s PL materials are non-radioactive, toxic-free, non-flammable and harmless, containing no phosphorus or lead, or any other hazardous element or chemical, and can be recharged an infinite number of times. The term phosphorescence is sometimes used to describe luminescence, but LightLeadĄ¯s PL materials contain no phosphorus. It is not recommended to eat.

 
Q4:  How does LightLead's PL pigment work? Top
A4. Photon boost the electron to jump into a higher level energy orbit, the energy is released in light form as the electron returns to its ground level.
 

Q5: What lights are best to charge LightLeadĄ¯s pigment and how long does it take to charge? 

A5: Sunlight, lamp light, all visible light with sufficient luminance intensity and UV light. Depending on illuminance intensity of charging source, LightLeadĄ¯s pigment will charge with as little as 10 lux of light. Thirty minutes of light at 110-120 lux is enough for LightLeadĄ¯s pigment to glow safely for 10-12 hours. The higher illuminance, the shorter fully-charged period.
 
Q6: How bright and long does LightLead's pigments actually glow?
A6: The amount of glow depends upon one's perception. The powder will glow for over 12 hours, but how well you see the glow depends upon a number of factors. If there is ambient light, your eyes will have a tendency to adjust for that ambient light. If your eyes are not well adjusted to the dark, you may have trouble seeing the glow. If you get up in the middle of the night and walk into a dark room with the powder, you will see it very well. If you come from outside on a sunny day and walk into the same room, the glow will be very bright but you will not see the glow until your eyes adjust to the darkness. In dark room, by emitting-light from fully-charged LightLead's PL pigment in a bottle(diameter 35mm, height 50mm), the 12# Times New Roman characters are readable for one hour at a distance of 10cm. And it has been scientifically tested to emit light for up to 21 days in laboratory conditions.
 
Q7: Will it replace traditional electrical emergency lighting?
Top
A7: In some extent, yes. But it is mostly used as a necessary supplement nowadays. LightLeadĄ¯s photoluminescent materials were originally designed to complement existing emergency lighting systems but continuous improvements in luminance performance mean that in certain circumstances high quality photoluminescent products can replace emergency lighting. They can be sited at waist or skirting level so they can still function if the ceiling lights become obscured by smoke. Similarly, life saving appliances and fire fighting equipment become more visible and are easily located in an emergency. Some emergency lighting can take up to 15 seconds to activate. In these instances, photoluminescence can be a lifesaver. 
 
Q8: May I use PL material outdoors? Top
A8: Yes, in some applications. LightLeadĄ¯s PL material resists UV light, applicable in temperature range of -40 to 500 Celsius Degree, has excellent weather and heat resistance. All LightLeadĄ¯s SrAl PL pigments are in good lightfastness, to use directly under sunlight is OK.
 
Q9. Water/high moisture condition? Top
Most SrAl pigment canĄ¯t be used in water, or under high moisture conditions. The specified pigment items and those water-proof-treated are applicable.
Q10. Heat resistance? Top
A10. As being heated, Eu2+ will be oxidized to Eu3+ then make the PL pigment lose its glowing property. Such losing is permanent and irreversible. Yellow green items start changing at 500ĄãC and will rapidly change @850ĄãC, blue green items start changing @800ĄãC and will rapidly change @1050ĄãC.
 
 
What can I do with the PL pigment?
How much Photoluminescent pigment does it take?
How to select a suitable Photoluminescent pigment?
 
 

Part II - About using PL pigments

Q11. What can I do with the PL pigment? Top
A11. Almost anything that you want to make it glow.
You can mix it into a transparent or semi-transparent medium such as resin, wax, paint, ink, paste, plastics, rubber, fabric, caulking, ceramic glaze, glue, nail-polish etc. There are numerous industrial applications for safety, for novelty, for fun, for household using in arts and crafts. PL pigment can meet expectation of all purposes above-mentioned. Some detailed applications, such as PL egress signs, sudden darkness orientate system, outline marking, cell phone case, keyboard cover pad, art-candles, screen-printing ink, night-glow shirts, toys, clothes, pavement walk-brick, glass mosaic, glass drinking cups, garden decoration lights, etc., have been applied.
More application ideas are welcomed to share with us, we are pleased to work with you together to get a perfect finished product.
 
Q12: How much Photoluminescent pigment does it take? Top
A12: It depends on your expectation on luminance intensity of finished product. The dosage ratio of photoluminescent pigment to medium will depend on how much glow desired, your cost budget, market positioning, application method, medium type, pigment type, etc. A general guideline shows that rates 5% to 20% by weight are all OK.
In a simple word, a lower dosage rate and a more economic pigment grade will be better if the target market is at low-end side, in which a lower price is more important and the cost budget is more strict and tight. Anyway, experimentation will be the best method to determine the dosage ratio.
 
Q13: How to select a suitable Photoluminescent pigment? Top
A13: Shall balance the cost and workability.
In PL pigments world, the finer of PL pigment particle grains, the lower of the pigment glowing luminance intensity, and the better workability. So at the same luminance intensity, the finer in particle size, the higher in cost. Consequently to select pigment in workable particle size range as coarse as it can be to save cost.  Contact us for suggestion and recommendation in pigment item selection.
 
 
May I request free sample? How can I buy in a small quantity?
How long it will take to get the items I ordered?
 
 

Part III - About sample and shipping

Q14. May I request free sample? How can I buy in a small quantity? Top
A14. Yes. LightLead offers viewing samples 50-grams free of cost with freight collect. Please obtain and test our quality with our 20grams glow powder sampler package from our online store http://www.aliexpress.com/store/1181116. This will give you a great idea of what to expect from larger quantities.
 
Q15. How long it will take to get the items I ordered? Top
A15. For sample/trial order, it will take around 3-5 working days.