Broadening and enhancing emission of Cr3+ simultaneously by co-doping Yb3+ in Ga1.4In0.6SnO5

• Published in: Journal of rare earths 2023-12, Vol.41 (12), p.1895-1903
• Main Authors: Zhao, Shuang, Mu, Zhongfei, Lou, Lulu, Yuan, Shuwen, Liao, Min, Lin, Qiuming, Zhu, Daoyun, Wu, Fugen
• Format: Article
• Language: English
• Subjects: Cr3; Near-infrared; Rare earths; Ultra-broadband; Yb3
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/j.jre.2022.10.012

Cr3+ doped broadband near-infrared (NIR) emitting phosphors are currently the focus of research. Researchers have developed a variety of strategies to achieve broad and strong NIR emission. However, it is a conundrum to simultaneously broaden and enhance the emission of Cr3+ with a single strategy. In this work, we solved this problem by co-doping Yb3+. Under 452 nm excitation, Ga1.4In0.6SnO5 (GISO): 0.01Cr3+ shows ultrabroadband NIR emission covering 650–1300 nm with a peak of 884 nm. The full width half maximum (FWHM) of the emission is 215 nm and the internal quantum yield (IQY) is 25%. This indicates that the double sites occupation strategy is favorable to achieve ultra-broadband NIR emission. The co-doping of Yb3+ can effectively broaden and enhance the emission of Cr3+. The FWHM for GISO: 0.01Cr3+, 0.002Yb3+ extends to 245 nm, and the IQY increases to 28%. Further increasing the concentration of Yb3+ to 0.005, the IQY is lifted to 32%. Finally, a pc-LED was prepared by integrating the GISO: 0.01Cr3+, 0.002Yb3+ with a blue light chip. Under the current drive of 40 mA, the maximum output power of pc-LED is 4.54 mW, and the photoelectric conversion efficiency is 4.12%. These results indicate that Yb3+ ions can simultaneously broaden the emission band and improve the emission efficiency. This work provides an effective strategy for the design of efficient broadband NIR phosphors in the future. By introducing Yb3+ ions, we can effectively broaden the bandwidth and enhance the emission efficiency of GISO: 0.01Cr3+ [Display omitted] •The emission band of the GISO: 0.01 Cr3+ contained a broad emission covering the 650–1300 nm region.•The GISO: 0.01 Cr3+ has a FWHM of 215 nm and an IQY of 25%.•The co-doping of Yb3+ can effectively broaden emission band and enhance the emission intensity of Cr3+.•The FWHM for GISO: 0.01Cr3+, 0.002Yb3+ extends to 245 nm, and the IQY increases to 28%.•Increasing the concentration of Yb3+ to 0.005, the IQY is lifted to 32%.