Mn4+/Zn2+:YAG glass ceramic for light emitting devices. (September 2018)

• Record Type: Journal Article
• Authors: Jiang, Jutao; Cheng, Yinzi; Chen, Wei; Liu, Zhicong; Xu, Tao; He, Meiling; Zhou, Lei; Yuan, Rongrong; Xiang, Weidong; Liang, Xiaojuan
• Is Part Of: Materials research bulletin. Volume 105(2018)
• Page Start: 277
• Page End: 285
• Publication Date: 2018-09
• Subjects: Mn4+ -- Red-emitting phosphor -- Luminescent -- Glass ceramic; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.05.003
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Luminescence of Mn 4+ :YAG red phosphor was enhanced via Zn 2+ doping. Mn 4+ /Zn 2+ :YAG GC was successfully prepared via one-step low temperature co-sintering technique. A series of lighting device was achieved by coupling the Mn 4+ /Zn 2+ :YAG GC with the commercial blue chips and Ce 3+ :LuAG GC. Abstract: The rare-earth-free Mn 4+ -activated oxide red phosphors draw great attention for their potential applications in the field of light-emitting diodes (LEDs). In this work, the red-emitting Mn 4+ /Zn 2+ :Y3 Al5 O12 phosphor, showing strong red emission peaked at ∼ 672 nm as a result of the spin-forbidden 2 E2g → 4 A2g electron transition of Mn 4+ ions under 478 nm excitation, was synthesized by a traditional solid-state reaction route in air. The microstructure and luminescent performance of this red-emission phosphor was investigated in detail. From the experimentally measured spectroscopic data, the crystal field strength (Dq) and the Racah parameters B and C were calculated, respectively. In addition, Zn 2+ dopant was found to be beneficial for enhancing Mn 4+ luminescence. Subsequently, Mn 4+ /Zn 2+ :YAG glass ceramic was successfully prepared via using Mn 4+ /Zn 2+ :YAG phosphors incorporated into tellurate glass. A tunable lighting device was successfully achieved by coupling the red-emitting Mn 4+ /Zn 2+ :YAG GC with the commercial blue chips and Ce 3+ :Lu3 Al5 O12 GC.