Synthesis of chlorinated TiO2 nanocrystals and their application in quantum dot light emitting diodes

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

New Journal of Chemistry Pub Date : 2026-05-30 DOI:10.1039/D6NJ01489E

Chenhao Xu, Chen Lin, Mengxin Liu, Xinan Shi and Daocheng Pan

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Abstract

To further improve the efficiency and stability of quantum dot light-emitting diodes (QLEDs), it is essential to explore electron transport layers (ETLs) with superior properties. Metal oxide nanocrystals, featuring wide bandgaps, suitable energy level alignment and low cost, have been widely used as ETLs in QLEDs. In this study, we prepared oleic acid-capped TiO₂ nanocrystals with a narrow size distribution and high crystallinity. To enhance the charge transport capability of the TiO₂ ETL, these nanocrystals were chlorinated using thionyl chloride (SOCl₂), yielding alcohol-dispersible TiO₂ nanocrystals with good colloidal stability. Furthermore, a wide-bandgap CaMoO₄ interfacial layer was introduced between the ETL and the quantum dot emissive layer to suppress exciton quenching. Consequently, the optimized TiO₂-based QLEDs achieved a maximum external quantum efficiency of 11.38%, a peak luminance of 100 920 cd m⁻² and a current efficiency of 17.12 cd A⁻¹. This work provides a new strategy for the development of high-performance TiO₂-based QLEDs.

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氯化二氧化钛纳米晶的合成及其在量子点发光二极管中的应用

为了进一步提高量子点发光二极管（qled）的效率和稳定性，有必要探索具有优异性能的电子传递层（ETLs）。金属氧化物纳米晶体具有宽带隙、合适的能级对准和低成本等优点，已广泛应用于qled的etl中。在本研究中，我们制备了尺寸分布窄、结晶度高的油酸包覆TiO2纳米晶体。为了提高TiO2 ETL的电荷输运能力，将这些纳米晶体用亚硫酰氯（SOCl2）氯化，得到具有良好胶体稳定性的醇分散型TiO2纳米晶体。此外，在ETL和量子点发射层之间引入了宽带隙CaMoO4界面层来抑制激子猝灭。结果表明，优化后的tio2基qled的最大外量子效率为11.38%，峰值亮度为100 920 cd m−2，电流效率为17.12 cd a−1。这项工作为高性能tio2基qled的发展提供了新的策略。

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