Preparation and characterization of multifunctional Li+ co-doped LaOCl: Eu3+ for sensor, phosphor and catalytic applications

Abstract

In the present work, a sequence of Li+ (0–5 mol %) ions co-doped LaOCl: Eu3+ (7 mol%) samples were synthesized via a solid-state route. The compounds are crystallized in a tetragonal phase with space group P4/nmm (No. 129). The bandgap energy of synthesized phosphor is found in the range of 4.21–4.31 eV. Cyclic voltammetry (CV) and Electrochemical (AC) Impedance spectroscopy by means of carbon paste electrode in 0.1 M KOH electrolyte were carried out. CV curve confirms the prepared electrode sense the mercury and tin in the concentration range 1–5 mM. The consequence of co-doping Li+ ions (3 mol%) upon the luminescence of LaOCl: Eu3+ is investigated and found to be 3.3 times enhancement of emission intensity. Transition probabilities, radiative lifetime, branching ratio, and intensity parameters were estimated from Judd-Ofelt theory. The CIE and CCT values are estimated with the help of emission spectra. The CIE color coordinates (0.625, 0.375) of all the samples stood nearer to viable red phosphor and well matches with Y2O2S:Eu3+ (0.647, 0.343), Y2O3: Eu3+ (0.629, 0.3651) and NTSC (0.67, 0.33) ensuing in Li+ ions co-doped LaOCl : Eu3+, to acts as a favorable material for red phosphor. Upon UV-light irradiation, the samples with 1 to 5 mol% Li+ ions exhibited superior photocatalytic activity of Rh.B and among them, 4 mol% Li+ ions co-doped sample degrade 91.15 % in 60 min. Thereby results reveals the benefit of synthesized samples for electrochemical sensor, solid state display and photocatalytic applications.