[en] This paper presents the results concerning the photoluminescence spectra of 53ZrF₄-20BaF₂-2LaF₃-2YF₃-3AlF₃-(20-x)NaF-xEuF₃ multi-component heavy metal fluoride glasses with the Eu³⁺=0.2, 0.4, 0.8, 1.0, 1.2 and 1.4 mol% in order to evaluate the threshold of concentration quenching (C_q=1 mol%) which corresponds to the concentration limit clearly revealing an intense red emission (⁵D₀→⁷F₂ at 614 nm) from such a luminescent glass. A bright red emission was observed by the naked eye from these materials under an UV source. The dopant ion concentration quenching on the emission behaviour has been ascribed to cross-relaxation and dipole-dipole interactions in the glass matrices. Influence of changes in active ions content (N_Eu³⁺x10²² cm^-3) on the values of inter-ionic distance (r_i A) and polaron radius (r_p A) has been verified. The photoluminescence spectra are constituted essentially by six emission transitions of (⁵D₀→⁷F_{J=0,1,2,3,4,5}) between the wavelengths of 575 and 720 nm. We have also investigated the dependence of emission intensities and lifetimes on various pump wavelengths and identified a more suitable excitation line at 394 nm, which belongs to the transition ⁷F₀→⁵L₆ of Eu³⁺ ion