A Taiwan-based research team has developed spray synthesis technology for producing perovskite quantum dots (PQDs). The technology reportedly features a photoluminescence quantum yield rate of nearly 100% and high color purity and stability of PQDs, according to Ministry of Science and Technology (MOST), which sponsors the R&D project.

Using spray synthesis technology, nanometer-sized perovskite crystals are separated from perovskite precursors in solvent and then the crystals are centrifuged to extract PQDs of same sizes, said Lin Hao-wu, which leads the team from the Department of Material Science and Engineering, National Tsing Hua University (NTHU).

The technology is said to be superior to conventional injection technology in photoluminescence quantum yield rate, crystallinity and stability, Lin said.

PQDs have excellent photophysical properties. Through adjusting chemical composition of perovskite, light emission of PQDs can vary from deep blue to near infrared in wavelength, rendering PQDs suitable for use in Rec. 2020 wide-color-gamut display technology, including micro LED, Lin added.

The R&D project has attracted the interest and cooperation of the University of Tennessee and Seoul National University.