Highly stable CsPbBr3 perovskite quantum dots incorporated in aluminum stearate

CsPbBr 3 perovskite quantum dots (PQDs) have drawn much attention for their high photoluminescence quantum yield and great potential in optoelectronic applications. However, they suffer from poor stability under humid condition. This paper reports CsPbBr 3 PQDs incorporated in aluminum stearate (AlSt 3 ) matrix via an improved co-precipitation approach, in which AlSt 3 not only acted as hydrophobic matrix to protect CsPbBr 3 PQDs from surrounding environment, but also passivated the surface of PQDs via the coordination bond of St-Cs and St-Pb, as well as bond between Al 3+ and Br − . By this method, the as-synthesized CsPbBr 3 -AlSt 3 composites exhibited excellent stability in ambient condition even directly in water for more than 60 days. With the CsPbBr 3 -AlSt 3 composites (green emission) used as color-conversion layer, a white light-emitting diode (WLED) was fabricated with a high color rendering index (Ra) of 90 and a low color temperature (Tc) of 4929 K. These results suggest that this method pave an effective way to stabilize CsPbBr 3 PQDs, which is of great importance for their further application.