# Monthly Archives - 十月 2018

## Basic knowledge of rare earth

Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth Rare Earth In fact, this is just a misunderstanding left over from the 18th century. Several rare earth elements were discovered successively after 1787, but the corresponding mineral discoveries were few. Due to the limitations of science and technology [...]

## Experiment of preparing long afterglow materials by combustion method

Experiment part: Objective: Learn to use the combustion method to rapidly grow the afterglow materials. Understand long afterglow material and its long afterglow principle. Learn to rapidly synthesize inorganic oxides and nanomaterials by combustion method. The synthesis method of long afterglow materials and the related steps of combustion synthesis experiment Experiment principle: Combustion is also called self – propagating high – temperature synthesis. It is a kind of chemical system with high exothermic heat induced local chemical ignition through external energy, forming frontier combustion wave, making [...]

## Some common long afterglow materials and afterglow time

Long afterglow material Main peak Time color SrAl2O4:Eu,Dy 520nm >60h green CaAl2O4:Eu,Nd 450nm >20h blue Sr4Al14O25:Eu,Dy 486nm >30h blue Sr2MgSi2O7:Eu,Dy 466nm >20h blue Ca2MgSi2O7:Eu,Dy 545nm >20h green MgSiO3:Mn, Eu,Dy 644nm ~4h red Cd2Ge7O16:Mn 585nm >3h orange MgSnO4:Mn 499nm >5h green Zn3Ga2Ge2O10:Cr 700nm >360h red

## Contrast of zinc sulfide and strontium aluminate phosphor luminescent powder

What is traditional Zinc Sulphide pigment? Some of the first phosphors to be developed were inorganic zinc sulphide compounds. (German submarine commanders during World War I reportedly rubbed these compounds on their hands to read documents during blackout conditions.) These phosphors typically absorb energy from deep blue and ultraviolet light and emit it as yellow-green light.This is useful in that the peak spectral distribution of the emitted light roughly coincides with the peak spectral sensitivity of the human visual system [...]

## Photoluminescent Pigment Production Technic Process

( Information for reference ) Phosphor is a special crystal structure luminescent material, which has a strong absorbance – STORING – luminous ability, when illuminated by natural light and the light, that part of the light energy is absorbed and stored, and then in the form of visible light in the dark Slowly release the luminescent material after five minutes after the light in the dark can automatically light for more than 12 hours of light absorption process can be [...]