Novel Mn4+ doped Ca2GdSbO6 red–emitting phosphor: A potential color converter for light‐emitting diodes. Issue 8 (20th February 2019)

• Record Type: Journal Article
• Authors: Liang, Jia; Devakumar, Balaji; Sun, Liangling; Sun, Qi; Wang, Shaoying; Huang, Xiaoyong
• Is Part Of: Journal of the American Ceramic Society. Volume 102:Issue 8(2019)
• Page Start: 4730
• Page End: 4736
• Publication Date: 2019-02-20
• Subjects: Light–emitting diodes -- luminescence properties -- Mn4+ ions -- Red–emitting phosphors; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.16353
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: As potential color converter towards white/red light–emitting diodes, novel Ca2 GdSbO6 :Mn 4+ phosphors with excellent optical performances were prepared by a conventional solid–state reaction route. The as–prepared phosphors with monoclinic crystal system had abundant [SbO6 ] octahedrons for Mn 4+ ions to occupy and stably exist. With an excitation of 356 nm, an intense red emission peaking at 676 nm attributed to 2 Eg → 4 A2g transition of Mn 4+ ions can be observed in the emission spectrum. The critical concentration of Mn 4+ ions was found to be 0.6 mol% and the concentration quenching mechanism was also discussed in detail. Importantly, the Ca2 GdSbO6 :0.6%Mn 4+ phosphors exhibited a high internal quantum efficiency of 38.9%. Abstract : Novel red phosphors Ca2 GdSbO6 :Mn 4+ with high efficiency were developed.