Eur. Phys. J. Plus (2022) 137: 630
https://doi.org/10.1140/epjp/s13360-022-02834-0

Regular Article

Enhanced photoluminescence and decay studies of Li co-doped LaAlO₃: Ce³⁺phosphor for display applications

¹ Department of Physics, B.M.S. Institute of Technology and Management, Visvesvaraya Technological University, 560064, Belagavi, Bangalore, Karnataka, India
² Department of Physics, R.N.S Institute of Technology, Visvesvaraya Technological University, 560098, Belagavi, Bangalore, Karnataka, India
³ Department of Chemistry, Siddaganga Institute of Technology, Visvesvaraya Technological University, 572103, Belagavi, Tumakuru, Karnataka, India

^b s.pratibha.87@gmail.com

Received: 8 October 2021
Accepted: 16 May 2022
Published online: 27 May 2022

Abstract

In this work, we present phase and morphological analysis, detailed photoluminescence (PL), and decaystudies of Li co-doped LaAlO₃: Ce³⁺ nanophosphor successfully prepared via disaccharide-assisted solution combustion technique. The phase formation of the sample is confirmed through powder X-ray diffraction (PXRD) studies, and the average crystallite size was estimated to be 40–50 nm. SEM images revealed the formation of almost spherical and agglomerated nanoparticles, and particle size was verified from TEM analysis. The bandgap energy of LaAlO₃: Ce³⁺_1.5: Li (1–9 mol%) samples was calculated in the range 4.9–5.4 eV. The phosphors display an effective blue emission at 417 nm and 437 nm when excited at 375 nm which is the characteristic transition of the 5d to 4f energy level of Ce³⁺ ion. The addition of Li⁺ remarkably increases the emission intensity which may be due to the effect of charge compensation. The emission color of the prepared phosphors was confirmed from CIE studies. Decay studies of the prepared nanophosphors were reported. These results indicate that thesephosphors are a good candidate for luminescence-based optoelectronic device applications.