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Efficient and Stable CdSe/CdS/ZnS Quantum Rods-in-Matrix Assembly for White LED Application.

Yujuan Chen¹, Weishuo Xing¹, Yixuan Liu¹

¹Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, 5340 Xiping Road, Tianjin 300401, China.

Nanomaterials (Basel, Switzerland)

|February 16, 2020

Summary

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We developed efficient and stable quantum rod assemblies (QRAs) by embedding cadmium selenide/cadmium sulfide (CdSe/CdS) quantum rods in a zinc sulfide (ZnS) matrix. These QRAs exhibit high quantum efficiency and excellent photo- and thermal-stability for optoelectronic applications.

Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Cadmium selenide/cadmium sulfide (CdSe/CdS) core-shell quantum rods (QRs) show promise for optoelectronic devices.
Existing CdSe/CdS QRs often suffer from low quantum efficiency and poor stability.
Need for enhanced stability and efficiency in quantum rod-based materials.

Purpose of the Study:

To develop an efficient and stable quantum rod assembly (QRA) using CdSe/CdS QRs embedded in a ZnS matrix.
To investigate the structural, optical, and stability properties of the novel QRAs.
To demonstrate the potential of QRAs in optoelectronic applications, specifically in white light-emitting diodes (WLEDs).

Main Methods:

Growth and embedding of CdSe/CdS QRs within ZnS matrices to form QRAs.

Keywords:

assembly core-shell light-emitting diodes quantum rod stability

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Structural characterization of the QRAs to confirm encapsulation and interconnection by ZnS.

Photoluminescence quantum efficiency (QE) measurements, photo-stability tests, and thermal stability assessments at elevated temperatures.

Main Results:

The ZnS matrix effectively encapsulates and interconnects the CdSe/CdS QRs.
The resulting QRAs achieve a high quantum efficiency (QE) of up to 85%.
QRAs demonstrate excellent photo- and thermal-stability, retaining 93% QE at 100 °C and showing only 2% degradation after 100 hours of continuous excitation.
Fabricated WLEDs using QRAs exhibit high optical performance and light quality.

Conclusions:

The ZnS matrix encapsulation significantly enhances the quantum efficiency and stability of CdSe/CdS QRs.
The developed QRAs are highly stable under thermal stress and prolonged optical excitation.
QRAs show significant potential for advanced optoelectronic applications, including high-performance WLEDs.