Mn-Doped cesium lead halide perovskite nanocrystals with dual-color emission for WLED

CsPbX3 perovskite nanocrystals (NCs) are promising materials for light-emitting optoelectronics, which possess optically tunable bandgap, bright photoluminescence (PL), and excellent photoluminescence quantum yield. However, doping this new class of promising NCs with optically active or magnetic transition metal ions are still limited. Based on the status quo, we synthesized Mn-doped CsPbCl3 and CsPb(Cl/Br)3 NCs by one-pot synthesis method using MnCl2·(H2O)4 as the precursor. The intensity and position of this Mn-related emission are also tunable by altering the experimental parameters, such as reaction temperature and the Pb-to-Mn feed ratio. Highly homogeneous spectral characteristics of Mn luminescence from an ensemble of Mn-doped CsPbX3 NCs, and well-defined electron paramagnetic resonance spectra of Mn2+ in host CsPbX3 NCs lattices suggest relatively uniform doping sites, likely from substitutional doping at Pb2+. In spite of the excellent luminescent properties of Mn-doped CsPbX3 NCs, their instability is still an important issue that obstruct their practical applications. In this paper, we reported a screen printing technology to prepare Mn-doped CsPbCl3 epoxy resin (ER) orange film for enhancing the stability of Mn-doped CsPbCl3 NCs. More importantly is that we fabricated NCs-ER with Y3Al5O12:Ce3+ (YAG:Ce3+) phosphor-in-glass (PiG) realized the chromaticity tuning for YAG:Ce3+ phosphor with white light-emitting-diodes (WLED). In short, warm WLED were constructed by blending the Ce-PiG and orange Mn-doped CsPbCl3-ER materials with the InGaN blue chips.