A MAPbBr3:poly(ethylene oxide) composite perovskite quantum dot emission layer: enhanced film stability, coverage and
Hongtao Yu1, Yao Lu, Zengqin Feng
1Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications (NUPT), 9 Wenyuan Road, Nanjing 210023, China. iamsfchen@njupt.edu.cn provost@nwpu.edu.cn.
Nanoscale
|April 27, 2019
Summary
We enhanced the stability of metal halide perovskite quantum dots (PQDs) using poly(ethylene oxide) (PEO). This PEO encapsulation improves ambient stability and boosts the performance of PQD-based light-emitting diodes (LEDs).
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Metal halide perovskite quantum dots (PQDs) show promise for displays and lighting due to excellent optical properties.
- Stability and surface defects hinder the large-scale application of PQDs.
- Developing stable and efficient PQD-based devices remains a critical challenge.
Purpose of the Study:
- To enhance the stability and performance of colloidal perovskite quantum dots (PQDs).
- To investigate the effect of poly(ethylene oxide) (PEO) encapsulation on PQD properties and device efficiency.
- To provide a scalable method for fabricating stable PQD films and efficient light-emitting diodes (LEDs).
Main Methods:
- High-surface-area colloidal PQDs were encapsulated with long-chain poly(ethylene oxide) (PEO) via simple mixing.
- The PEO-encapsulated PQDs were incorporated into MAPbBr3 light-emitting diodes (LEDs).
- Ambient stability, photoluminescence quantum yield, and electroluminescence spectra were characterized.
Main Results:
- PEO encapsulation effectively passivated surface defects and protected organic ligands on PQDs.
- Ambient stability and photoluminescence quantum yield of PQDs were significantly improved.
- MAPbBr3 LEDs exhibited stable green electroluminescence over a 5-12 V range with an 18.3-fold increase in external quantum efficiency.
Conclusions:
- Poly(ethylene oxide) (PEO) provides a simple and effective method for stabilizing metal halide perovskite quantum dots (PQDs).
- PEO encapsulation enhances PQD optoelectronic properties and device performance, particularly in light-emitting diodes (LEDs).
- This approach offers a robust platform for fabricating high-quality PQD films and efficient, stable PQD-based LEDs.
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