Enhancing the luminescence performance of an LED-pumped Mn4+-activated highly efficient double perovskite phosphor with A-site defects via local lattice tuning. Issue 45 (31st October 2022)

• Record Type: Journal Article
• Authors: Li, Liang; Cao, Qianwen; Xie, Jing; Wang, Wenming; Wang, Yubei; Chen, Hongmei; Li, Zhongyuan; Pan, Yan; Wei, Xiantao; Li, Yong
• Is Part Of: Dalton transactions. Volume 51:Issue 45(2022)
• Page Start: 17180
• Page End: 17191
• Publication Date: 2022-10-31
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt02806a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Enhancing luminescence performance of Mn 4+ -activated highly efficient double perovskite phosphor with A-site vacancies via local lattice tuning (left), and warm white and far-red light-emitting diodes prepared with the phosphors (right). Abstract : Altering the local symmetry of an activator by lattice tuning is considered an effective strategy to optimize the luminescence performance of phosphors. Herein, the novel Mn 4+ -activated double perovskite phosphor La1.67 MgTaO6 (LMTO) with A-site defects was successfully prepared. Benefiting from the random occupation of the nearest A-site by cations and vacancies, the distorted [MnO6 ] octahedra lack the inversion center. The LMTO:0.4 mol%Mn 4+ phosphor has a significant zero-phonon line intensity with a high internal quantum efficiency (IQE) value of 62.97% after the Laporte selection rule is broken. Furthermore, local lattice tuning was performed by increasing the randomness of the A-site and the distortion index of the [MnO6 ] octahedron by co-doping with Ca 2+ or Sr 2+ ions. Importantly, the IQE value of the samples was enhanced from 62.97% to 72.65% and the activation energy increased from 0.497 eV to 0.548 eV, which can be well applied in the fields of plant cultivation and warm white light-emitting diodes. These studies provide valid fundamental insights for the selection of excellent luminescent matrices to obtain efficient Mn 4+ -activated phosphors via local lattice tuning.