Octave-spanning broad luminescence of Cr3+, Cr4+-codoped Mg2SiO4 phosphor for ultra-wideband near-infrared LEDs. (24th May 2019)

• Record Type: Journal Article
• Authors: Nanai, Yasushi; Ishida, Ryota; Urabe, Yuki; Nishimura, Seiya; Fuchi, Shingo
• Is Part Of: Japanese journal of applied physics. Volume 58:Number SF(2019)
• Publication Date: 2019-05-24
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/1347-4065/ab0b9f
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: We synthesized Cr 3+, Cr 4+ -codoped Mg2 SiO4 phosphors and studied their optical properties for application as a novel wideband near-infrared (NIR) light-source. The phosphors have an ultra-wideband NIR luminescence spectrum of 650–1400 nm. The origin should be the 4 T 2 → 4 A 2 transition of Cr 3+ and the 3 T 2 → 3 A 2 transition of Cr 4+ . The luminescence spectrum spans over one octave range and covers the "optical window in biological tissues". We successfully achieved an ultra-wideband luminescence of 650–1400 nm with a maximum output power of 367.5 μ W by combining a blue LED with Cr 3+ and Cr 4+ -codoped Mg2 SiO4 phosphors in a single package.