A broadband near-infrared Sc1-x(PO3)3:XCr3+ phosphor with enhanced thermal stability and quantum yield by Yb3+ codoping

作者：Yu, Ting^*; Sheng, Haoyang; Chen, Shenghai; Yuan, Jian; Deng, Tingting; Wu, Ming; Guo, Yue^*; Zeng, Qingguang

来源：Journal of the American Ceramic Society, 2022, 105(5): 3403-3417.

DOI：10.1111/jace.18319

• broadband near-infrared
• Cr3+
• energy transfer
• phosphor-converted LED
• Sc(PO3)(3)

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 Cr3+-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 Cr3+ 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 Yb3+ ions. In the light of the analysis of excited-state dynamics, we demonstrate that the enhancement mechanism is ascribed to the efficient Cr3+-> Yb3+ energy transfer from the thermal sensitive Cr3+ centers to the thermal stable Yb3+ emitters. An NIR pc-LED device has been finally fabricated by the combination of a blue-emitting chip and a Cr3+/Yb3+ codoped Sc(PO3)(3) phosphor whose potential application for broadband NIR pc-LEDs is also discussed.

• 单位
  广东工业大学; y; 佛山科学技术学院