Some enamel signs that people see on the side of the road and in the tunnel have a luminous effect. Even in an environment without lights at night, they can clearly see the signs and characters on the road signs and signs. What is the principle of this? Why does enamel still shine? Today we are going to talk about luminous enamel. 

The enamel layer will emit light, mainly because a luminescent agent is introduced into the enamel frit, and this luminescent agent will emit visible light under the excitation of external energy. Generally, ZnS is introduced as a luminescent agent for enamel, and ZnS will generate fluorescence when excited. At present, SrO•Al2O3 luminescent agent has been successfully developed. Compared with ZnS luminescent agent, the luminescent enamel using SrO•AlO3 as luminescent agent has the advantages of high luminous intensity, long afterglow, good chemical stability, and non-toxicity.

There are usually three types of enamel pre-excitation luminescence: high energy excitation, photoexcitation and electric excitation. High-energy excitation is high-energy ionizing radiation that causes radiant photoexcitation to emit light. For example, introducing a small amount of radioactive material can make the enamel glow continuously. Photoexcitation is the fluorescence emitted by luminescent enamel under the action of a visible light source. Electrical excitation generally refers to electroluminescence, which is to pass current to the enamel containing fluorescent emitters, and under the action of an electric field, the fluorescent emitters are excited to emit light.

The role of luminous enamel has attracted much attention, and is now widely used in road signage, theater signage, car signs, instrument indicator lights and other purposes.