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Synthesis and Characterization of BaSi 2 O 2 N 2 : Eu Nitride based Phosphor

This paper discusses synthesis, photoluminescence and mechanoluminescence properties of Eu activated BaSi2O2N2 oxinitride phosphor. The material was synthesized through modified two step high temperature solid state diffusion technique. The prepared sample was confirmed by XRD technique. The Eu 2+ activated BaSi2O2N2 material shows efficient emission at 504nm due to 4f 6 5d 1 4f 7 transitions of Eu 2+ ion under excitation at 355nm.The quenching of prepared sample occurred at 1mole%. This phosphor is potential phosphors that may be applicable in solid state lighting. The impulsive excitation of mechanoluminescence (ML) in Eu 2+ doped barium based phosphor reports the shifting of peaks toward shorter time values with increasing impact velocity. It is also seen that the total ML intensity ITotal initially increases with impact velocity and then it attains a saturation value for higher values of impact velocity. The peak ML intensity Im and total ML intensity IT increase quardratically with the applied load and impact velocity. The present study may also be helpful in preparing ML-based light source by increasing trap-depth of shallow traps. If the ML emission in certain materials will be in ultraviolet range, then the ML pulses of short duration may be used to excite the phosphorescence and determining the decay time. This fundamental work might be applicable for ML sensors