Effects of annealing temperature doping concentration and excitation wavelength on photoluminescence characteristics of GdOClBi3 phosphor powders - Babiker Mohammed Jaffar Jabraldar; Nadir A.M. Saeed; R.E. Kroon; Rudolph Erasmus; Odireleng Martin Ntwaeaborwa (ELSEVIER SCIENCE BV, 2024)