Efficient red and broadband near‐infrared luminescence in Mn <sup>2+</sup> /Yb <sup>3+</sup> ‐doped phosphate phosphor
Langping Dong, Liang Zhang, Yonghui Xu, Shuwen Yin, Hongpeng You
Abstract
Abstract In this work, we report a novel phosphor LSPO:Mn 2+ that exhibits red emission at about 616 nm and pleasant broad near‐infrared (NIR) emission at about 800 nm with a full width at half maximum (fwhm) of 112 nm. The structure and spectra show that the doped manganese ions occupy two kinds of Sc sites forming Mn1 and Mn2 emission centers, which are responsible for red and NIR emission, respectively. The XPS and low‐temperature fluorescence spectra reveal that both red and NIR emissions come from the Mn 2+ ions. Besides, NIR luminescence is improved by doping Yb 3+ in LSPO:Mn 2+ , leading to the broadened NIR emission range (700‐1100 nm) and enhanced luminescent thermal stability. Our results suggest that the prepared LSPO:Mn 2+ and LSPO:Mn 2+ ,Yb 3+ phosphors offer the potential applications as red and NIR components in phosphor‐converted white‐light‐emitting diodes (pc‐WLED) and broadband NIR pc‐LED. Meanwhile, this work provides a new way to design novel broadband NIR phosphors.