[1] Bahauddin Zakariya Univ, Dept Phys, Thin Films Lab, Multan 60800, Pakistan
[2] Univ Faisalabad, Govt Coll, Dept Phys, Layyah Campus, Layyah 31200, Pakistan
[3] Bahauddin Zakariya Univ, Inst Chem Sci, Multan 60800, Pakistan
[4] Shaukat Khanum Mem Canc Hosp & Res Ctr, Dept Radiat Oncol, Lahore 54000, Pakistan