Enhanced emission from CH3NH3PbBr3 perovskite films by graphene quantum dot modification

Abstract

Organic-inorganic hybrid perovskites have emerged as promising emitters with the benefits of low cost and high color purity, but their low luminescence efficiency is a drawback for practical application on light emitting devices. Here we show that by incorporating proper amount of graphene quantum dots (GQDs) into perovskite precursor, dense CH _3 NH _3 PbBr _3 films with reduced grain size and well passivated grain boundaries could be obtained. This gives rise to enhanced emission from GQD modified perovskite films. Our work thus provides a viable way to prepare highly luminescent perovskite films for optoelectronic applications.

Keywords

• organic-inorganic hybrid perovskite
• graphene quantum dot
• crystal growth
• defects
• luminescence