Abstract
CsPbBr3/Cs4PbBr6 nanocomposites recently were found to yield efficient luminescence. However, the formation mechanism of the nanocomposites is unclear, and large-scale and green synthesis is still challenging. Here, we develop a self-assembly reaction to fabricate CsPbBr3/Cs4PbBr6 nanocomposites efficiently and environmentally friendly. The transmission electron microscopy clearly shows CsPbBr3 nanocrystal is embedded in Cs4PbBr6 matrix, forming a CsPbBr3/Cs4PbBr6 composite structure. In situ characterization reveals that the CsPbBr3/Cs4PbBr6 nanocomposites are formed by a two-step reaction, driven by ion concentration difference. The self-encapsulation and separation of the CsPbBr3 NCs by the host Cs4PbBr6 result in the material exhibiting a high PLQY of 83% and narrow-band emission at 517 nm with a full width at half-maximum of only 21 nm. Further, we fabricate an on-chip white light-emitting diode (LED) using the as-synthesized CsPbBr3/Cs4PbBr6 nanocomposites as a green emitter and red K2SiF6:Mn4+ phos...
Published Version
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