Citation: Mei, Dajiang; Cao, Wangzhu; Wang, Naizheng; Jiang, Xingxing; Zhao, Jun; Wang, Weikang; Dang, Junhui; Zhang, Shiyan; Wu, Yuandong; Rao, Pinhua; Lin, Zheshuai (2021). Breaking through the “3.0 eV wall” of energy band gap in mid-infrared nonlinear optical rare earth chalcogenides by charge-transfer engineering. Materials Horizons, 8, pp. 2330-2334.