Improving the data transmission rates for optical wireless communication by surface passivation of CsPbBr₃ quantum...

Quantum dots (QDs) preserve short photoluminescence (PL) lifetime and are widely developed for optical wireless communication (OWC). However, QDs often suffer from surface defects that limit their performance. In this work, we investigate the impact of post-treatment with didodecyldimethylammonium bromide (DDAB) and PbBr₂ on the OWC performance of CsPbBr₃ QDs. The treatment significantly improves the PL properties, leading to an increased quantum yield of 98% and a prolonged PL lifetime of 1.24 times compared to untreated QDs. As a consequence, the -3dB bandwidth and maximum data transmission rates under on-off-keying (OOK) modulation are also enhanced, reaching 0.79 and 1.15 times those of pristine QDs, respectively. This improvement highlights the importance of surface passivation for optimizing CsPbBr₃ QDs in OWC applications.