A broadband near‐infrared Sc1−x(PO3)3:XCr3+ phosphor with enhanced thermal stability and quantum yield by Yb3+ codoping. Issue 5 (22nd January 2022)

• Record Type: Journal Article
• Authors: Yu, Ting; Sheng, Haoyang; Chen, Shenghai; Yuan, Jian; Deng, Tingting; Wu, Ming; Guo, Yue; Zeng, Qingguang
• Is Part Of: Journal of the American Ceramic Society. Volume 105:Issue 5(2022)
• Page Start: 3403
• Page End: 3417
• Publication Date: 2022-01-22
• Subjects: broadband near‐infrared -- Cr3+ -- energy transfer -- phosphor‐converted LED -- Sc(PO3)3; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.18319
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Broadband near‐infrared (NIR) phosphors converted light‐emitting diodes (pc‐LEDs) have attracted tremendous attention for their great potential in NIR spectroscopy applications. Herein, we report on the photoluminescence (PL) properties of Cr 3+ ‐doped Sc(PO3 )3, which exhibits a broadband NIR emission centered at 900 nm with a full width at half‐maximum (FWHM) of 161 nm upon excitation at 480 nm. In terms of the examination of spectroscopic parameters, we find that Cr 3+ ions occupy a weak crystal field site ( Dq / B = 1.94) in the Sc(PO3 )3 host with a stronger electron–phonon coupling (Huang‐Rhys factor, S = 5.5), which results in a serious thermal quenching and a low internal quantum efficiency (IQE). Thermal stability and IQE of phosphors can be substantially enhanced by the introduction of Yb 3+ ions. In the light of the analysis of excited‐state dynamics, we demonstrate that the enhancement mechanism is ascribed to the efficient Cr 3+ →Yb 3+ energy transfer from the thermal sensitive Cr 3+ centers to the thermal stable Yb 3+ emitters. An NIR pc‐LED device has been finally fabricated by the combination of a blue‐emitting chip and a Cr 3+ /Yb 3+ codoped Sc(PO3 )3 phosphor whose potential application for broadband NIR pc‐LEDs is also discussed.