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Facile synthesis of CsPbBr3/PbSe composite clusters
Thang Phan Nguyen1, Abdullah Ozturk2, Jongee Park3
1School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul, Republic of Korea.
Science and Technology of Advanced Materials
|January 4, 2018
Summary
Adding selenium (Se) to cesium lead bromide (CsPbBr3) quantum dots enhances their stability and shifts their emission color. This research demonstrates improved photoluminescence intensity retention in air for CsPbBr3/PbSe nanocomposites.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Dot Research
Background:
- Perovskite quantum dots (QDs) like CsPbBr3 are promising for optoelectronic applications but suffer from instability.
- Self-enlargement and degradation limit the practical use of CsPbBr3 QDs.
Purpose of the Study:
- To synthesize CsPbBr3/PbSe nanocomposites to enhance the stability of CsPbBr3 quantum dots.
- To investigate the effect of selenium (Se) incorporation on the optical and structural properties of CsPbBr3 QDs.
Main Methods:
- Synthesis of CsPbBr3 and PbSe nanocomposites.
- Characterization using UV-Vis absorption, photoluminescence (PL) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoemission spectroscopy (XPS).
Main Results:
- Incorporation of Se into CsPbBr3 QDs increased the band gap from 2.38 to 2.48 eV, shifting emission from green to blue.
- XRD analysis revealed a structural transition from cubic to orthorhombic in CsPbBr3 QDs upon PbSe introduction.
- CsPbBr3/PbSe nanocomposites exhibited enhanced photoluminescence stability in air, retaining 50% intensity after 81 hours compared to pristine CsPbBr3 (20%).
Conclusions:
- Low amounts of Se significantly improve the air stability of CsPbBr3 quantum dots.
- The formation of CsPbBr3/PbSe nanocomposites offers a viable strategy for developing more robust perovskite optoelectronic materials.
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