Li et al. report layer-by-layer fully thermal evaporated perovskite LEDs using 5-aminovaleric acid as an additive to regulate the crystallisation. Red LEDs with efficiency of 9% and 7.27% are achieved at 670 nm and 730 nm, respectively. The technique is extendable to deposit large-area and patterned perovskite thin films.
- Yajing Li
- Na Meng
- Wei Huang
