luminescent sheets is generally divided

 Of course , the three asked the table can be part of the solution to this problem, but visually see the time is realglow glow in the dark tape of the important reasons that people like to watch . Above result, people began to fluorescent material coated hands and hour markers and the dial scale , so at night you can easily read the time. Luminescence material is generally divided into two categories: one is the material is photoluminescent river rock, heat radiation and light, and the other is material to absorb energy and is excited to an excited state ( non-steady -state ) and then return to the ground state of the process, in order to light released in the form of energy.