Enhancing Near-Infrared Photoluminescence Intensity and Spectral Properties in Yb 3+ Codoped LiScP 2 O 7 :Cr 3+

作者：Leqi Yao, Qiyue Shao, Shouyu Han, Chao Liang, Jinhua He, Jianqing Jiang · 发表于：Chemistry of Materials · 年份：2020 · DOI：10.1021/acs.chemmater.9b04934 · 被引用次数：344 · 研究领域：Luminescence Properties of Advanced Materials、Luminescence and Fluorescent Materials、Advanced Photocatalysis Techniques

Near-infrared (NIR) phosphors have received increasing attention for designing novel solid-state light sources with broadband NIR output. In this work, a novel NIR phosphor LiScP 2 O 7:Cr 3+ (LSP:Cr 3+ ) is developed with the emissions (750–1100 nm) completely in the NIR spectral range. Under 470 nm excitation, LSP:0.06Cr 3+ shows broadband NIR emissions peaking at ∼880 nm, with a full width at half maximum (FWHM) of ∼170 nm and an internal quantum yield (IQY) of ∼38%. Moreover, photoluminescence (PL) improvements of LSP:Cr 3+ phosphors are achieved by Yb 3+ codoping, leading to the broadened FWHM (up to ∼210 nm), increased IQY (η max = ∼74%), and reduced thermal quenching. The energy transformation processes in LSP:Cr 3+,Yb 3+ are quantitatively analyzed on the basis of PL lifetime and QY measurements, revealing that the PL improvements by Yb 3+ codoping principally originate from the energy transfer from Cr 3+ to more efficient and thermally stable Yb 3+ emitters. Finally, NIR phosphor-converted light-emitting diodes (pc-LEDs) are fabricated by combining LSP:Cr 3+,Yb 3+ phosphors with blue LED chips, giving a maximum NIR output power of ∼36 mW and photoelectric efficiency of ∼12% at 100 mA drive current. The results suggest that the investigated phosphors would be promising luminescent converters for broadband NIR pc-LED applications.