Abstract
The advancement of pure-red perovskite light-emitting diodes (PeLEDs) is still a challenge because of surface “wastes” (like surface vacancies and excessive insulating ligands) on quantum dots (QDs). Herein, we develop a method to synthesize single-halide pure-red CsPbI3 QDs, combining a strong quantum confinement effect and meticulous surface-cleaning-induced ligand exchange. We achieve pure-red emitting QDs by controlling the size and uniformity under iodide-rich conditions. Subsequently, vacancy defects and insulating ligands are cleared through introducing acid. Then this surface-cleaning process induces ligand exchange to further inhibit the nonradiative recombination and improve the electrical property of QDs. These QDs show a pure-red photoluminescence (PL) at 635 nm with the PL quantum yield (PLQY) of 99%. Finally, PeLEDs, which utilize these QDs, demonstrate a pure-red electroluminescence (EL) peak at 638 nm with a maximum external quantum efficiency (EQE) of 26.0%
Original language | English |
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Pages (from-to) | 4115–4123 |
Number of pages | 9 |
Journal | ACS Materials Letters |
Volume | 6 |
Issue number | 9 |
Early online date | Aug 2024 |
DOIs | |
Publication status | Published - 7 Aug 2024 |
Bibliographical note
Publisher Copyright:© 2024 American Chemical Society.
Funding
We gratefully acknowledge all of the funds which support this work. This work is financially supported by the National Natural Science Foundation of China (Nos. 52302171, 12074016 and 12274009), Shandong Provincial Natural Science Foundation, China (ZR2023QF005), Heilongjiang Provincial Natural Science Foundation of China (LH2023F026, LH2020A007 and LH2020F027), New Era Longjiang Excellent Doctoral Dissertation Project (LJYXL2022-003), the Research and Development Project from the Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering (2022SX-TD001), Teaching Reform Research Project of Harbin Engineering University (79005023/013) and the Fundamental Research Funds for the Central Universities (3072024XX2606, 3072022TS2613, 79000012/012).
Funders | Funder number |
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Beijing Excellent Doctoral Thesis Project | LJYXL2022-003 |
National Aerospace Science Foundation of China | 12074016, 12274009, 52302171 |
Harbin Engineering University | 79005023/013 |
Shandong Provincial Education Science Plan | ZR2023QF005 |
Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering | 2022SX-TD001 |
Heilongjiang Postdoctoral Science Foundation | LH2020A007, LH2023F026, LH2020F027 |
Support Program for Longyuan Youth and Fundamental Research Funds for the Universities of Gansu Province | 3072024XX2606, 3072022TS2613, 79000012/012 |
Keywords
- Nanocrystals
- Perovskite
- Stability