Luminescence properties of Ho3+ ions in Pb3O4−B2O3−P2O5−ZnO-AIIIx (AIIIx=Al2O3, Ga2O3, and In2O3) glasses

Abstract

Ho³⁺ doped Pb₃O₄−B₂O₃−P₂O₅−ZnO glasses, mixed with group IIIA oxides such as Al₂O₃, Ga₂O₃, and In₂O₃, are fabricated by conventional melting and quenching methods. X-ray diffraction, scanning electron microscopy (SEM), Energy dispersive spectrum (EDS) and Fourier transform infrared techniques (FTIR) were used to characterize these glasses. Optical absorption, Photoluminescence spectra and decay profiles were also registered. Photoluminescence spectra of the three glass compositions obtained at λₑₓ_c = 361 nm, showed prominent bands corresponding to ⁵F₃,⁵S₂, ⁵F_5,⁴F₄ →⁵I₈ emission transitions. Among different glasses, the GaPBPZHo glass exhibited the maximal emission intensity. The emission spectra suggested that the ligands surrounding the Ho³⁺ ions in Ga₂O₃doped glasses exhibited greater asymmetry and lower covalence, enhancing their luminescence output. Notably, the quantum efficiency (η) of the ⁵S₂→⁵I₈ transition of Ho³⁺ ions was found to be the maximal for GaPBPZHo glass. The CIE chromaticity coordinates (x = 0.577, y = 0.385) for this glass indicated intense green emission, highlighting its potential for use in photonic devices and high-quality green light-emission applications.