Preparation, structural and optical characteristics of a deep red-emitting Mg2Al4Si5O18: Mn4+ phosphor for warm w-LEDs. (January 2018)

• Record Type: Journal Article
• Authors: Fu, Anjie; Zhou, Liya; Wang, Song; Li, Yinghao
• Is Part Of: Dyes and pigments. Volume 148(2018)
• Page Start: 9
• Page End: 15
• Publication Date: 2018-01
• Subjects: Phosphor -- Aluminosilicates -- Luminescence properties -- Manganese; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.08.050
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A novel red-emitting phosphor Mg2 Al4 Si5 O18 :Mn 4+ is successfully synthesized using a solid-state reaction method. Aluminosilicate Mg2 Al4 Si5 O18 of low-symmetry orthorhombic phase contains abundant octahedrons and is suitable for Mn 4+ doping. A broad absorption band ranging from 240 nm to 550 nm in the ultraviolet–visible spectra corresponds to the photoluminescence excitation spectrum. The emission spectrum from 650 nm to 750 nm exhibits a strong emission peak at 680 nm because of the 2 Eg → 4 A2g transition of Mn 4+ ion. The critical distance Rc for concentration quenching is ∼33.3 Å, and the energy transfer mechanism is determined to be dipole–dipole interaction. Luminescence mechanism is analyzed using the energy level diagram of Mn 4+ ion. Racha parameters B and C are evaluated and used to discuss the nephelauxetic effect for the Mn 4+ ions in the Mg2 Al4 Si5 O18 . Temperature-dependent fluorescence test demonstrates the good thermal optical properties of the phosphor. An assembled light-emitting diode (LED) device with efficient luminescence demonstrates its practical use. Results indicate the potential application of the phosphor for white LEDs. Graphical abstract: Highlights: Red phosphors Mg2 Al4 Si5 O18 :Mn 4+ were synthesized for the first time. This phosphor can be efficiently excited by near-UV/blue light to emit deep red emission. Temperature dependence spectrums are investigated to demonstrate its good thermal stability. The fabrication of red-emitting LED revealed its potential application in WLEDs.