Study On Color Centers Of Photo-store In Inorganic Crystal

The information transmitted online is in the form of digit. In the hospital network isimperative. Then, in radioactive department, only if film image can be changed into digitform, it can be shared through network. The invention of CR can develop digital filmtechnique. CR uses its IP to save the image in BaFBr: Eu²⁺, then it can be detected throughphotostimulated luminescence. However, the BaFBr: Eu²⁺ photostimulated wavelength is closeto either YAG ( large and expensive) or He-Ne ( inconvenience) laser. If the semiconductorlaser, which is small and cheap, can replace the two lasers mentioned above, both the priceand size will decrease. However, the laser wavelength should be above 650nm. In this case,there's a higher requirement for the BaFBr:Eu²⁺, that means its wavelength should be redshifted until it's over 650nm. It is widely used to change the host component to narrow downthe width of the gap. This method can reduce the comprehensive properties, although it canred shifted the wavelength. Without changing the host component, how to keep the sameexcellent comprehensive properties, while red shifting the wavelength, and keeping the strongintensity? This paper has accomplished these changes by doping the different metal ions toform the complex color center, and further research on the structure and properties of complexcolor center has been done. The followings are some of the creative aspects.1. It put forward the idea of adding the metal ions to form complex color centers to red shiftthe BaFBr:Eu²⁺ laser wavelength, while keeping the strong luminescent, without changingthe host component, and keeping the excellence in comprehensive properties. During theexperiment, the new type of complex color center materials are made and have beenapplied to patent. IP can use cheap and tiny semiconductor laser as photostimulated source,.2. It is the first time, through theory analysis, the interrelationship of complex color centerbetween photostimulated luminescence and thermalstimulated luminescence has beenfound. Then reach the conclusion that complex color center is formed by F(Br^-), which isinfluenced by doped metal ions. The result above has been applied to analysis differentsynthesis of BaFBr:Eu²⁺ doped metal ions successfully.3. It is the first time to observe the Raman peak in high frequency region due to the fact of complex color center doped with metal ions in Raman spectra. The conception of Raman diffraction factor K has been brought up and explained, which has theory significance to explain the Raman spectra properties of host material doped with metal ions.4. Different complex color centers construction models have been set by Raman and ESR spectra. It is the first time to observe new ESR signal, which belongs to O_Br^- centers. And O_Br^- centers is efficient vacancy traps by the experiment analysis.