The common problems and solutions
1. The suppliers said the luminous time of the photoluminescent pigment can sustained for more than ten hours, why the observe the results are different?
(1) In theory, the luminous time of the photoluminescent pigment can sustainabled for more than ten hours (under the certain condition,after inspiring the of photoluminescent powder and observation.When the brightness reach the 0.32 MCD/m2, it stopped luminous ). MCD/m2 is a unit of photoluminescent. The minimum value of light visible to the naked eye is 0.32 MCD/m2.
(2) The photoluminescent pigment is a kind of products that absorb the light and storage the energy,after the effectively stimulate, the luminous performance effect will be the best . The light sensitivity of the photoluminescent powder followed by :ultraviolet light, sunlight, incandescent light, yellow light. Long-term photoliminescent powder need at least 15 to 30 minutes.The short-acting photoliminescent powder need for 2-5 minutes (depending on the strength of the light) depends on the strength of the light. Can make the photoluminescent powder storage the energy till the relative saturation state. After the photoluminescent powder absorbing the light till the saturated state ,then observation. The night before, you can see it keep glowing (in terms of the photoluminescent powder of the long-term photoluminescent powder ).
(3) The photoluminescent pigment is the weak light source, must be in the dark, and observation close . In our daily life, always happens the street lamp bright during the day. If you don't look straight at the street light, will not realized that the street lamp is brighting.Here we have a set of data.During the day,the brightness outside is 10000-10 0000 cd/m2 .Indoor brightness is 1000-5000 CD/m2, lamplight commonly be １００—１０００cd/m2. The brightness of the photoluminescent powder after 2 minutes is 2-3 CD/m2, after 60 minutes ,the light is around 0.1cd/m2. And after ten hours general be 0.006 ~ 0.010 CD/m2. So that’s why the photoluminescent powder is the weak light source,and must be observed in the dark.
(4) If the photoluminescent pigmen applied in the specific products,the glowing effect have the relationship with thefollowing factors: the choice of photoluminescent powder, adding scale, medium of transparency, coating thickness and the attention degree of the application note.
2. Is the photoluminescent pigment really nontoxic , harmless, and no radioactive?
The photoluminescent pigment is divided into the spontaneous light energy storage type
and radioactive.The light-emitting principle of the spontaneous light energy storage type simply is when the photoluminescent powder under the light irradiation,can storage the light energy,and converted into light energy ,then released it.The characteristic is luminescence brightness decay quickly,and short duration.The light-emitting principle of the radioactivephotoluminescent powder is incorporation of radioactive materials to the photoluminescent powder.Using the rays from radioactive substances continuously,and Stimulate phosphor luminescence.The characteristic is the luminous intensity is relatively stable,and bright for a long time.But the radioactive, not suitable
for civilian use.So what we use is the former.The spontaneous light energy storage photoluminescent powder.Non-toxic harmless and no radioactive.
3.The photoluminescent pigment has a variety of particle size.How to choose?
(1) When choosing the photoluminescent pigment,first ,should according to the requirements and processing technology of the products to select photoluminescent powder particle size.
(2) The annotations particle size of the photoluminescent powder,generally be the range of the average particle size. (like 200-300 mesh)
