Optik 158 (2018) 826–830 Contents lists available at ScienceDirect Optik journal homepage: www.elsevier.de/ijleo Original research article Study of lyoluminescence of gamma-irradiated GdCa 4 O(BO 3 ) 3 :Ce phosphors: Mass of solute and pH of solvent as a key factor G.C. Mishra a,∗ , S.J. Dhoble b , Ashok Srivastava c , Surendra Dwiwedi d , R.S. Kher e a Department of Physics, O P Jindal University, Raigarh, India b Department of Physics, R.T.M. Nagpur University, Nagpur, India c Department of Metallurgical Eng., O P Jindal University, Raigarh, India d Department of Mechanical Eng., O P Jindal University, Raigarh, India e Department of Physics, Bilaspur University, Bilaspur, India a r t i c l e i n f o Article history: Received 12 December 2017 Accepted 30 December 2017 Keywords: Lyoluminescence GdCa4O(BO3)3 Solid state diffusion a b s t r a c t In present day all the non linear optical phosphors are prepared by keeping view of ecolog- ical prospectus and low cast with longer existance. We prepared Ce 3+ doped GdCa 4 O(BO 3 ) 3 crystal by solid-state diffusion technique for these aim. Lyoluminescence (LL) of the gamma- ray-irradiated sample was recorded. A single sharp peak was observed in the LL glow curve of the sample. Lyoluminescencce yield depends on many paprameters as; gamma dose, particle size of the sample, amount of the solute, amount of the solvent, pH value of the solvent, temperature of the srroungings etc. Present paper reports dependence of LL of -ray-irradiated GdCa 4 O(BO 3 ) 3 :Ce phosphors on the mass of the solute and pH value of the solvent. Results show that the LL intensity increases with increasing quantity of solute dropped on to the sample variation in LL intensity with pH is observed. © 2017 Published by Elsevier GmbH. 1. Introduction Ionizing radiation plays qualitative and quantitative role in the present day context due to its uses in various applica- tions like radiation medicine, radiotherapy, food processing, radiation based polymerization, and nondestructive testing techniques using radiography. When high energy phosphors are dissolved in a solvent light is emitted called Lyolumi- nescence (LL). It was first reported in 1895, by Widdmann and Schmidt [1]. The LL phenomenon has been developed to find its applications as a system, especially for tissue equivalent radiation dosimetry, detection of irradiated food materi- als, radiation damage studies in solids, accident dosimetry and in the detection of irradiated food materials [2–4]. A new series of calcium containing rare-earth borates have been synthesized [5]. This family is isostructural with composition of LnCa 4 O(BO 3 ) 3 (Ln = La, Sm, Nd, Gd, Er, and Y) and space group is monoclinic, non-centro-symmerty. They have good thermal and chemical stability and are good host for luminescent material under UV excitation [6,7]. In recent past we published synthesis, and thermoluminescence (TL) charactrisation of GdCaO 4 (BO 3 ) 3 :Ce [8] and synthesis, TL and LL characterisation of YCaO 4 (BO 3 ) 3 :Ce phposphors [9]. LL yield of phosphors depends on many parameters as, mass of solute, amount of solvent, particle size, pH value of solvent etc. Since no systematic investigations on mass solute and pH value dependence of LL ∗ Corresponding author. E-mail address: girish.mishra@opju.ac.in (G.C. Mishra). https://doi.org/10.1016/j.ijleo.2017.12.189 0030-4026/© 2017 Published by Elsevier GmbH.