Solution-Processed Zn-Doped In2S3 Electron Transport Layers for Quantum Dot Light-Emitting Diodes.
Youhua Zuo1, Chen Lin1, Xuecong Shen1
1State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures; Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials; Guangxi Key Laboratory of Advanced Rare Earth Materials; School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 25, 2026
Summary
This study introduces Zn-doped In2S3 as a novel electron transport layer (ETL) for quantum dot light-emitting diodes (QLEDs). These metal sulfide ETLs significantly improve charge transport, leading to enhanced QLED performance.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Wide-bandgap metal oxide nanoparticles like ZnO, SnO2, and TiO2 are standard electron transport layers (ETLs) in quantum dot light-emitting diodes (QLEDs).
- The application of metal sulfide nanoparticles as ETLs in QLEDs has not been previously reported.
Purpose of the Study:
- To investigate the potential of bandgap-tunable and mobility-adjustable Zn-doped In2S3 thin films as ETLs in QLEDs.
- To establish a new design strategy for high-performance QLEDs utilizing metal sulfide ETLs.
Main Methods:
- Fabrication of Zn-doped In2S3 thin films with tunable bandgaps and adjustable mobility.
- Integration of these Zn-doped In2S3 films as ETLs in red inverted QLED devices.
- Characterization of the optoelectronic performance of the fabricated QLEDs.
Main Results:
- The Zn-doped In2S3 ETLs demonstrated appropriate electron mobility and high electrical conductivity, enhancing charge transport efficiency.
- Red inverted QLEDs employing 20% Zn-doped In2S3 ETL achieved a maximum external quantum efficiency (EQE) of 12.97%.
- The devices exhibited a peak current efficiency of 17.86 cd A-1 and a maximum luminance of 89,100 cd m-2.
Conclusions:
- Zn-doped In2S3 is identified as a promising ETL material for developing high-performance QLEDs.
- This work presents a novel concept for designing advanced QLEDs using metal sulfide-based ETLs.
