December 2nd (Thu) Graduate Seminar / Prof. Haizheng Zhong

In-situ Fabricated Perovskite Quantum Dots：From Synthesis to Applications

Perovskite quantum dots (PQDs) are now emerging as functional materials for many photonic applications due to their superior optical properties and easy fabrication. In 2015, we report ligand-assisted reprecipitation (LARP) of brightly luminescent and color tunable perovskite quantum dots. In 2016, we reported the in-situ fabrication of hybrid perovskite PQDs in polymeric films (PQDF) with high transparency, superior photoluminescence emission and additional processing benefits for down-shifting applications. The potential use of PQDF as color converters in LCD backlights was successfully demonstrated, showing bright potential in display technology. Very recently, we developed the in-situ fabrication of patterned PQDs for Micro LED and other down conversion applications. Moreover, we further explored the electroluminescence devices based in-situ fabricated PQDs. The electroluminescence devices with a maximum external quantum efficiency (EQE) of 16.3%, 15.8% and 8.8% were achieved for green, red and blue devices, showing the promising to achieve high efficiency. In addition, we also demonstrate the use of in-situ fabricated perovskite quantum dots for other applications including UV enhanced silicon photodetectors, photovoltaics, quantum dots based hyperspectrometer, etc. In all, the in-situ fabrication strategy provides very convenient route for display technology. In this talk, I will introduce the progress of in-situ fabricated perovskite quantum dots toward photonic and optoelectronic applications with a short introduction of quantum dots.

Fig. 1. Schematic illustration of the in-situ fabrication process, the optical images, absorption and PL spectra of the as-fabrication PQDFs.