Back to Search
Start Over
High luminescence and external quantum efficiency in perovskite quantum-dots light-emitting diodes featuring bilateral affinity to silver and short alkyl ligands
- Source :
- Chemical Engineering Journal. 414:128866
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Perovskite quantum dots (PeQDs) have been under commercial and functional development in recent years since they offer outstanding optoelectronic properties and solution processability. However, both insulating ligands around PeQDs and instability impair the performance of photoelectronic devices. Therefore, we introduce multi-step ligands exchange by silver (Ag)- trioctylphosphine (TOP) as short alkyl ligands to reinforce the optical properties and stability for PeQDs and successfully elevated light-emitting diodes characters. The PeQDs with Ag-TOP ligands (Ag@QD) perform higher photoluminescence quantum yield (PLQY, ~93%), higher exciton binding energy (57.6 meV) with better solvent, temperature, and ambient stability over 1 month presenting better performances on comparison with conventional di-dodecyl dimethyl ammonium bromide (DDAB) or TOP ligands. Nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), and time-resolved photoluminescence (TR-PL) measurement provides clear insight on bilateral affinity in Ag@QD illustrating excellent defect passivation and appropriate steric hindrance. Furthermore, we demonstrate Ag@QD with lower turn-on voltage (~2.8 V), high electroluminescence (~3820 cd/cm−2), and high efficiency (EQE ~ 9.43%).
- Subjects :
- chemistry.chemical_classification
Photoluminescence
Materials science
General Chemical Engineering
Trioctylphosphine
Quantum yield
02 engineering and technology
General Chemistry
Electroluminescence
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Industrial and Manufacturing Engineering
0104 chemical sciences
chemistry.chemical_compound
chemistry
Quantum dot
Environmental Chemistry
Quantum efficiency
0210 nano-technology
Alkyl
Perovskite (structure)
Subjects
Details
- ISSN :
- 13858947
- Volume :
- 414
- Database :
- OpenAIRE
- Journal :
- Chemical Engineering Journal
- Accession number :
- edsair.doi...........5556a658158f9d87e9e8e8aa8b9c4aa9