FA+ and Mn2+ codoped CsPbCl3 perovskite quantum dots with super thermal stability

Abstract

As a new generation of luminous material, perovskite quantum dots (PQDs) possess many excellent properties. However, PQDs suffer from dramatic decrease of optical performance when affected by high temperature. In this paper, methamidine acetate (FA + ) and manganese divalent cation (Mn 2+ ) codoped CsPbCl 3 quantum dots (QDs) were synthesized. The introduced FA + and Mn 2+ were designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. By comparison with CsPbCl 3 :Mn 2+ QDs, the results show that the CsPbCl 3 :FA + ,Mn 2+ QDs improve the blue exciton luminescence by 15% and the red Mn 2+ ions luminescence by 37%. Furthermore, CsPbCl 3 :FA + ,Mn 2+ QDs demonstrate super thermal stability by maintaining 97% of Mn 2+ emission when the temperature is raised to 70 °C even after 6 thermal cycles. Simultaneously, the UV light and water stability of CsPbCl 3 :FA + ,Mn 2+ QDs have also been obviously enhanced. The powder of the coped PQDs have been fabricated into a white LED which exhibits Color Rendering Index (CRI) of 88.2 and Correlated Color Temperature (CCT) of 5745 K. It shows that CsPbCl 3 :FA + ,Mn 2+ QDs not only reduce the Pb 2+ ions toxicity problem but also boost the thermal stability and thermal cyclability, which may open up more possibilities for the applications in optoelectronic devices.