Ytterbium-Doped CsPbCl 3 Quantum Cutters for Near-Infrared Light-Emitting Diodes

Exploring highly efficient near-infrared (NIR) emitting materials is desirable for the advancement of next-generation smart NIR light sources. Different from most reported Cr 3+ -doped emitters with far-red emissions, Yb 3+ -activated phosphors are expected to yield pure NIR (∼1000 nm) light. Herein, a new hot-injection route using all metal-oleate salts to fabricate Yb 3+ -doped CsPbCl 3 perovskite nanocrystals (PeNCs) is reported for the first time, which produce PeNC-sensitized Yb 3+ NIR emission with photoluminescence quantum yields (PLQYs) higher than 100%. With the help of temperature-dependent PL spectra, femtosecond transient absorption spectra, and time-resolved PL spectra, it is evidenced that the in situ produced intrinsic shallow trap states in a CsPbCl 3 host play a key role in facilitating the picosecond nonradiative cooperative energy transfer from PeNCs to two Yb 3+ dopants simultaneously. Using the optimized Yb 3+:CsPbCl 3 quantum cutters, a phosphor-converted NIR light-emitting diode (pc-NIR-LED) is fabricated, exhibiting an external quantum efficiency of 2%@28 mA, a high NIR output irradiance of 112 mW/cm 2 @400 mA, and excellent long-term stability. Finally, the designed pc-NIR-LED is demonstrated to have great potential as an invisible night-vision light source.