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Updated: Feb 25, 2026

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

強化されたエネルギー移動のための励起子波動関数非局在化を調整した合金量子ドット

Jia Luo¹, Yanhong Fan¹, Yanchao Zhao¹

¹South China Advanced Institute for Soft Matter Science and Technology, Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, School of Emergent Soft Matter, South China University of Technology, Guangzhou 510640, China.

The journal of physical chemistry letters

|February 23, 2026

Abstract:

Efficient exciton energy transfer from photoexcited quantum dots (QDs) is the key to achieving high performance across diverse applications. Exciton wave function delocalization favors energy transfer, yet fine-tuning the degree of delocalization remains challenging. Here, we demonstrate the modulation of exciton delocalization by engineering the exciton Bohr radius via tellurium doping in lead selenide (PbSe_1-xTe_x) alloy QDs. Using a QD-sensitized triplet-triplet annihilation upconversion system as a testing platform, we show that Te doping enhances energy transfer and boosts upconversion efficiency by up to 50-fold, before the poor stability of PbTe dominates at higher Te content. This doping strategy is also compatible with other optimizations, as shortening the surface ligands of PbSe_1-xTe_x QDs further enhances energy transfer and upconversion performance. Through femtosecond transient absorption microscopy, we further confirm that optimized Te doping accelerates early stage exciton transfer dynamics in QD thin films, indicating larger exciton delocalization. This strategy provides a versatile material-design route to optimize energy transfer in QD-based material systems.

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Compact Quantum Dots for Single-molecule Imaging

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