Benefited from the controllable synthesis of large-scale transition metal dichalcogenides (TMDCs), abundant physical properties of TMDC van der waals heterostructures, such as moire-exciton, electrostatic gating effects, interlayer magnetism, are widely reported. In optoelectronic categories, the applications of TMDC van der waals heterostructures involve interlayer exciton lasers, single photon emitters, and light-emitting diodes (LEDs). However, the employment of TMDCs in visible light emitter is still challenging due to their narrow band gap. The up-converted luminescence from TMDCs could be an effective way to achieve this goal, which has been reported rarely. In this work, the rare earth Yb/Er co-doped bilayer WSe₂ of atomic thickness is designed and synthesized using precursor ultrasonic mixing and molten-salt assisted chemical vapor deposition technology. A fascinating up-converted luminescence has been realized on the Yb–Er co-doped bilayer WSe₂ excited by 980 nm laser. The up-conversion luminescence peak at 550 nm originates from Er³⁺ energy level transition ⁴S_3/2→⁴I_15/2. Furthermore, a modulated visible electroluminescence is probed from the LED with architecture of Cr/Au electrodes on Yb–Er co-doped bilayer WSe₂/monolayer MoSe₂ van der waals heterostructure. Unveiling up-conversion luminescence in TMDCs opens a novel way of utility in photomedicine, infrared thermometer, and infrared photography, etc.

得益于大规模过渡金属二硫化二氢（TMDC）的可控合成，广泛报道了TMDC范德华异质结构的丰富物理性质，例如莫尔激子，静电门控效应，层间磁性。在光电类别中，TMDC范德华异质结构的应用涉及层间激子激光器，单光子发射器和发光二极管（LED）。然而，由于TMDC的窄带隙，在可见光发射器中使用TMDC仍然具有挑战性。TMDC的上转换发光可能是实现此目标的有效方法，但鲜有报道。在这项工作中，稀土Yb / Er共掺杂双层WSe ₂利用前驱体超声混合和熔融盐辅助化学气相沉积技术设计并合成了原子厚度。在由980 nm激光激发的Yb-Er共掺杂双层WSe ₂上实现了令人着迷的上转换发光。550nm处的上转换发光峰源自Er ³⁺能级跃迁⁴ S _3/2 → ⁴ I _15/2。此外，在Yb-Er共掺杂双层WSe ₂ /单层MoSe ₂上从具有Cr / Au电极结构的LED探测调制的可见电致发光。范德华力异质结构。在TMDC中揭示上转换发光为在光医学，红外温度计和红外照相等领域的实用性开辟了一条新途径。