Font Size: a A A

Study On The Spectrum Redshift Of SrAl2O4 Luminescent Materials

Posted on:2013-02-08Degree:MasterType:Thesis
Country:ChinaCandidate:X X QianFull Text:PDF
GTID:2211330371464669Subject:Textile Engineering
Abstract/Summary:PDF Full Text Request
In recent years, rare earth luminous products have been widely applied in people's daily life, such as luminous fiber, luminous plush toys, luminous embroidery, luminous fabrics,etc. Rare earth products can glow in the dark is because of the rare-earth luminescence materials added. The luminous intensity and time depends on the luminescent properties, and color depends on the emission spectrum.Alkaline earth aluminates long afterglow materials doped with rare earth ions are chemical stability, no radiation pollution, safe and green. SrAl2O4 system luminescence materials have excellent luminescent properties, are most widely used in luminous products. But it also have downside to humdrun light colors, its emission spectrum mainly concentrated in 440-520 nm (glaucous, yellow-green) range, lack of long band (yellow, orange, red) light color. Because of this, its production mostly only emit glaucous and yellow-green light, cold tonal and lack of diversity. Therefore, explore some methods to make its color turn to the long band direction (red shift) has important research meaning and practical value.In the research, we used two different methods to make the light color of SrAl2O4 system luminescence materials red shift. One was doped different rare earth ions into the materials during the preparation. Another was doped red azo dye in the SrAl2O4:Eu2+,Dy3+ luminescence materials. Compare the different principle and red shift effect.First, we chose the high temperature solid state to prepare SrAl2O4 system luminescence materials. Changed the doping amounts of rare earth ions to analyze their effects in the luminescence materials, and analyzed different rare earth ions how to affect the materials by emission spectrum and light color coordinates. The emission spectrum wavelengh of SrAl2O4:Eu2+,Nd3+ was 532 nm, appeared redshift relative to the most widely used luminescence materials SrAl2O4:Eu2+, Dy3+ (520 nm).Second, we add red azo dye into SrAl2O4:Eu2+,Dy3+ in the process of production. Chose the luminous coating fabric process, changed the ratio of red azo dye and luminescence materials, analyzed the effect of different doping amounts of red azo dye. The experimental results showed that, the light color of luminescence materials appeared redshift, but the luminous property was reduced at the same time. Under the premise of light visible to human eyes, the emission spectrum wavelength could red shift to 605 nm and the light color red shift to yellow area.The above two methods both could make the light color of SrAl2O4 system luminescence materials red shift. The first one was change the emitting mechanism, was substantially change. The second one was main reason of the light interference, was the effect of external factors, its red shift effect was more apparent than the first method. Although the principle were not the same, the two methods both could rich the light color of SrAl2O4 system luminescence materials in certain theoretical and experimental basis.
Keywords/Search Tags:luminescent materials, rare-earth element, SrAl2O4, azo dye, redshift, light color, long afterglow
PDF Full Text Request
Related items