What is the principle of luminous road photoluminescent pigment

Netherlands magical luminous paint can put to use to replace street lights? 

According to the BBC recently reported that Photoluminescent Gravel‍ the Dutch 500-meter long section of the highway will be the end of the light-emitting into the trial. The N329 road near Oslo City Highway, road markings using fluorescent paint, after charging in daylight, at night more than eight hours of continuous green fluorescence, thereby replacing the lights. 

The designer of the road expressed the hope that through this program to save energy, reduce costs and improve road safety purposes. 

Questions: 

What is the principle of luminous road? What's the difference with the traditional road reflective logo? It really can save energy and replace street lights? 

Answer: 

According to media reports, the nature of the road is the use of light-emitting a glow in the dark fluorescent powder to make signs, the roads automatic light. 

Road use light-emitting phosphors are long afterglow luminescent powder." Recently, Professor of Shanghai Jiaotong University Daide Chang told reporters that this material can absorb sun light during the day, at night and gradually release the green light. 

The material is sent only light in a dark environment, the eyes can be felt during the day feel." Professor of Chemistry and Molecular Engineering, East China University of Technology Shen Yongjia further explained to reporters, also called afterglow luminescent powder luminescent materials, in natural light irradiation, or other artificial light sources that can store energy of the external optical radiation, and at a photoluminescent paint‍ temperature (room temperature) and for a long period of time to slowly release the stored energy in the form of visible light luminescent materials. 

It is understood that since has good luminescent properties, since the 1990s, long afterglow luminescent powder began to receive widespread attention, and began to apply at night signs, emergency lighting and light-emitting ceramic. 

In China, the ground reflective logo has been an important means of auxiliary lights. By car lights, the driver can generally see the road. Then, add the mark compared to the way long afterglow luminescent powder, both of which have anything different? 

Daide Chang said that the main difference between the two is that one is self-luminous, a passive reflector. "Active glowing effect to be significantly better than conventional reflective effect, traffic safety has been significantly improved." 

In addition, the effect of long afterglow luminescent powder, the report pointed out that it can continue to light in the dark eight hours, in order to protect the lighting needs of the night, you can replace the lights. 

However, Shen Yongjia had a different opinion. "Based on its performance, luminous powder luminous at night only last about four to five hours." Shen Yongjia said, from the continuous emission time, it does not guarantee a night lighting. 

In addition, he said, adding a luminous pink road signs only a faint green, can not achieve adequate lighting effect. "This suit is not installed street lights in the field road use, traffic can be set to identify the scope, not to put the car into the ditch." 

also pointed out that luminous paint painted road lane for the region, street lighting between the lane marking can be covered, the use of light-emitting powder coating can not. 

At the same time, cost and stability of the luminous road has also been questioned scholars. 

The key element of long afterglow luminescent powder is rare." Shen Yongjia said before the rare earth prices, the domestic price of 1 kg flour is about 1,000 to 2,000 yuan, and now the price should be higher. 

Efficiency luminous pink haze on cloudy days to Glow in the dark materials‍ absorb energy and how high? Absorption efficiency is not high enough in the circumstances, how to ensure continuous light at night?" Experts believe that the luminescence on the road should be further stability and luminous efficiency research and planning.