Photoluminescence in Double Metal Chlorosilicate

Silicate based phosphors are widely used in display devices. There are some problems with synthesis and long term use of silicates. The main problem is very high and controlled  temperature synthesis method. Silicates need temperatures higher than 1000 C to 1400 C for synthesis. . Along with high temperature the other major drawback synthesized phosphor so obtained  get converted to glassy form. At high synthesis temperatures they can also react with low cost crucible materials such as porcelain and china clay. To  overcome these drawbacks an innovative novel synthesis method has been developed. During recent years, scientists have turned their attention towards chlorosilicates phosphors  to get good chemical, physical and thermal stability. Chlorosilicate hosts exhibited interesting luminescence properties involving two metal for tuning the emission and excitation spectra. In this paper thus, Ca3Al2Si2O8Cl4: Eu2+ phosphor has been  prepared through solid state reaction. The phosphor so obtained has been characterized by photoluminescence emission and excitation spectra. X ray diffraction method is also carried out  to confirm the crystal structure. Very interesting luminescence properties have been observed with a single emission band around 460 nm. In the excitation spectrum two broad overlapping bands  at 270nm and 330 nm is also observed. First Time thermo luminescence glow curve of Ca3Al2Si2O8Cl4 is observed.. These initial results indicate that Ca3Al2Si2O8Cl4: Eu2+ phosphor is a promising orientation for the realization of near ultraviolet light-emitting diodes.