photoluminescent pigment Various materials

Various materials 

Aluminate base 

Since 1993 the co-doped synthetic Matsuzawa Dy's SrAl2O4: Eu found its afterglow decay time up to 2000min. Subsequently, it has successively developed a series of rare-earth-activated aluminate long afterglow materials, such as blue CaA12O4: Eu, Nd, and blue-green Sr4Al14O25: Eu, Dy, its afterglow afterglow properties of materials and their parameters are shown in Table 1. Aluminate long afterglow Photoluminescent Tumbled Gravel‍ material, which is mainly activator Eu, mainly in the afterglow luminescent colors blue and green wavelength range. Today, although the water is not very good aluminate, aluminate long afterglow material SrA12O4: Eu, Dy and Sr4Al14O25: Eu, Dy still get a huge commercial applications, long-lasting materials is the main stage materials research and application concerns. 

Silicate-based 

Silicate matrix using long-lasting materials, as Portland has good chemical stability and thermal stability, while raw SiO2 cheap, easy to get, in recent years more and more people's attention, and this silicate materials are widely used in lighting and display areas. Since 1975, Japan developed the first Silicate Long Afterglow Zn2SiO4: Mn, As, its afterglow time of 30min. 

Since then, a variety of silicate materials have also Photoluminescent Rigid Sheet‍ been developed afterglow, as Sr2MgSi2O7: Eu, Dy, Ca2MgSi2O7: Eu, Dy, MgSiO3: Mn, Eu, Dy, material and performance parameters in Table 1. Silicate matrix material in the afterglow of the main activator Eu2 +, its luminous colors still concentrated in blue-green, although there are red afterglow silicate material reported. Better performance is the afterglow of Eu and Dy doped Sr2MgSi2O7 and Ca2MgSi2O7, its afterglow duration is greater than 20h. In addition, observed in Mn, Eu, Dy co-doped MgSiO3 three elements in the red afterglow phenomenon. Silicate aluminate long afterglow material has incomparable advantages in terms of water resistance, but its performance is worse than the aluminate. 

Other 

Apart from the above categories afterglow materials research as well as more long-lasting material sulfide ZnS: Cu, Co and CaS: Eu, Tm, represented, which is characterized by diverse colors, but only a maximum brightness of its initial afterglow 40mcd / m or so, and such material in the first few minutes, a sharp decrease in afterglow luminance, the afterglow time is short and effective. There Pr doped titanate CaTiO3: Pr, Al. Up to now, long-lasting luminescence in the oxidation system has been extensively studied, it is noteworthy that the chlorine oxide Ca8Zn 4Cl2? (SiO4??):? Eu, nitride containing Ca2Si5N8: Eu There are also long-lasting phenomenon. 

In addition, Professor Pan Zhengwei research group has developed a long near-infrared afterglow material Zn3Ga2Ge2O10: Cr, its afterglow time up to 360h.‍