eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences November, 2017 29 11 319 324 http://dx.doi.org/10.22147/jusps-B/291101 867 article SAJAN S.J. (sajanmalliyidathil@gmail.com) 1 GOPAKUMAR (gopkumar.n@gmail.com) 1 ANJANA P.S. 2 Post Graduate Department of Physics, Mahatma Gandhi College, Thiruvananthapuram, Kerala, India - 695004 Department of Physics, All Saints College, Thiruvananthapuram, Kerala, India- 695007 <p style="text-align: justify;">The undoped and Eu doped 0.5BaO.0.5 ZnO-Al2O3: xEu phosphors were prepared by the method of high temperature solid state reaction in air atmosphere. The phase formations of the samples were confirmed by taking powder XRD. Monoclinic phases of barium zinc oxides were identified. The mechanoluminescence (ML) studies of the samples were carried out via impulsive deformation technique (impact method). The ML emissions observed during the deformation of samples consist of two peaks such that intensity of second peak is relatively lower than the first. A large difference in ML decay timings were observed in undoped and Eu doped samples. Significant increase in ML intensities were observed due to Eu doping up to 0.3mole % and beyond that concentration of Eu the ML emission intensity decreases considerably. The decay constant of 0.5BaO.0.5 ZnO-Al2O3:0.3Eu is fairly good and also the sample showed a linear rise in intensity with impact velocity. All these suggest the suitability of the sample for stress sensing applications.</p> https://ultraphysicalsciences.org/paper/867/ XRD doping mechanoluminescence (ML)