New energy storage luminescent materials and their development trends(2)

Electroluminescent materials

Electroluminescence is the direct conversion of electrical energy into light energy of a solid luminescence phenomenon.

In 1923, Loservi in the study of silicon carbide detector, found in the silicon carbide crystal applied a positive bias, will be accompanied by the phenomenon of light emission. This phenomenon is the basis for the successful development of light-emitting diodes.

In 1936 C. Destrio found that suspended in the medium with a trace of copper to activate the zinc sulfide material, in the role of alternating electric field, will also be found visible light. 1950 years before and after the Americans according to this principle made a loss of area plane light source ". It was predicted that electroluminescence would become the third generation of light source after the point light source tungsten filament lamp) and the line light source fluorescent lamp). Because of its low working voltage (relatively safe), easy to use, low power consumption (energy-saving), it can be widely used in family rooms, corridors, wards and other night lighting. It can also be used as nighttime signs for traffic and public facilities.

Glow-in-the-dark paint

General luminous paint is divided into 2 categories, one is the accumulative luminous paint, some information to this kind of paint called the accumulative luminous paint or referred to as the accumulative paint. 

I think this naming is inappropriate, the reason is that this kind of paint is after daylight or indoor light irradiation (containing a specific light wave of ultraviolet lamps, etc.), in the dark can emit bright light with optical properties of the paint, since this, the author believes that this kind of paint is not to save the light and light, but due to the conversion of energy and optical properties. The paint needs to be irradiated by daylight or ultraviolet light, and the specific light wave energy irradiation makes it excited, and these excitation sources themselves are a kind of energy, the paint absorbs and stores this energy, and only after the energy is removed, the energy is converted into different colors of light visible to the naked eye. So the use of energy storage "than the storage of light" more reasonable some.

Another category is self-luminous luminous paint (luminous paint), this paint not only uses the accumulative material zinc sulfide fluorophore as a pigment), but also plus can produce radioactive substances such as trace amounts of radium, uranium, promethium, etc., these substances can produce radiation and lead to luminous. Because the element promethium than radium, uranium security is good, inexpensive, and has a higher luminous glow, so after 1960, the element promethium prepared by the luminous paint has gradually replaced radium, uranium and other radioactive substances and neutral resins and other made. Luminous paint luminous color and luminous time with the type of luminous pigment fluorescent body used and different.

Self-illuminated luminous paint does not need external excitation light source, does not consume electricity, simple structure, but because these materials contain radioactive substances, the human body and the environment will cause some harm, so subject to environmental protection regulations.