| Autor: |
Shin, Yun Seop, Yoon, Yung Jin, Lee, Kang Taek, Lee, Woojin, Kim, Hyeon Seo, Kim, Jae Won, Jang, Hyungsu, Kim, Minjin, Kim, Dong Suk, Kim, Gi-Hwan, Kim, Jin Young |
| Zdroj: |
ACS Applied Materials & Interfaces; July 2020, Vol. 12 Issue: 28 p31582-31590, 9p |
| Abstrakt: |
Inorganic lead halide perovskite nanocrystals (PeNCs) have intensively drawn attention as efficient light-emitting materials for optoelectronic applications due to their fine optoelectronic properties with a high photoluminescence quantum yield and easily tunable saturated emission color. However, the poor stability of the red-emitting PeNCs has become an obstacle because of the uncontrollable iodine substitution from the PeNCs due to weak Pb–I bonding. In this work, we have demonstrated a ligand-mediated post-treatment (LMPT) method using a halide ion-pair ligand, tridodecylmethyl ammonium iodide (TrDAI), for the air stable and high-quality red-emitting PeNCs. Through the LMPT method, the optoelectronic properties of red-emitting PeNCs are dramatically improved resulting in a PLQY of 88.7% at 637 ± 2 nm emission with an increased carrier lifetime from 20.77 to 31.52 ns. We achieve highly efficient red perovskite light-emitting diodes exhibiting a maximum current efficiency of 7.69 cd A–1and an external quantum efficiency of 6.36% at 637 ± 2 nm electroluminescence emission with a sharp full-width at half maximum of 31 nm. |
| Databáze: |
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