Photoluminescence

Study finds Bi2S3 semiconductor exhibits unusually slow electron-hole recombination

Researchers used terahertz, millimetre-wave conductivity, and photoluminescence probes to track photoexcited charge carriers in bismuth sulfide (Bi2S3) thin films over timescales from 200 femtoseconds to 1 microsecond. They found that most carriers recombine within about 100 nanoseconds via defect-mediated trapping, while at higher excitation intensities and shorter picosecond timescales, an intrinsic electron-hole recombination process dominates. The team modeled these combined behaviors using a rate equation that separates defect-related and intrinsic recombination contributions.

nature.com · 2026-10-28

Researchers decode hidden chemistry behind perovskite LED additive, boost efficiency to 37.1%

Scientists studying perovskite light-emitting diodes found that a common additive, 5-aminovaleric acid, reacts in precursor solutions to form two distinct products: a beneficial zwitterion and a harmful lactam byproduct. By controlling which reaction pathway dominates and using the purified beneficial compound directly, they achieved perovskite films with 97.2% photoluminescence quantum yield and devices reaching a record 37.1% external quantum efficiency, with an average of 32.8%.

nature.com · 2026-10-14