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红色体量子点发光二极管的双功能电子传输剂

Ya-Kun Wang^1,2, Haoyue Wan¹, Jian Xu¹

¹Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

Journal of the American Chemical Society

|March 10, 2023

概括

研究人员开发了一种新的有机电子传输层 (ETL),以改进红色酸 (InP) 量子点发光二极管 (LED). 这种新型ETL可以消除缺陷并防止性能降低,从而实现基于有机ETL的InP LED的创纪录效率.

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科学领域:

材料科学
光电子产品
纳米技术

背景情况:

化物 (InP) 量子点是无重金属,灵活的LED发射的关键.
红色InPLED中的ZnO/ZnMgO等现有电子传输层 (ETL) 由于缺陷和陷迁移而导致发光灭和性能问题.
2+陷和空位迁移被确定为InP/ZnSe/ZnSLED降解的主要原因.

研究的目的:

解决因ETL引起的红色量子点LED性能下降的问题.
开发一种双功能的ETL,使表面陷被动化,并防止层间空隙迁移.
为了提高有机ETL红色InPL的效率和稳定性.

主要方法:

一种新型双功能ETL的合成,CNT2T (3',3'′′,3'′′′′-(1,3,5-triazine-2,4,6-triyl)tris(([1,1'-biphenyl]-3-carbonitrile)).
CNT2T ETL具有用于电子移动的三酸核和用于表面被动化的星形结构.
将CNT2TETL集成到红色InP/ZnSe/ZnSLED中,并描述它们的光电子特性.

主要成果:

合成的CNT2TETL有效地使Zn2+陷无效,并防止空位迁移.
使用CNT2TETL的红色InPLED实现了15%的记录外部量子效率 (EQE).
这些设备显示高亮度超过12000cdm-2,为基于有机ETL的红色InPL灯具设定了新的基准.

结论:

新的双功能CNT2TETL显著克服了InP量子点LED中的传统ETL的局限性.
这种进步带来了设备性能的提高,包括更高的效率和亮度.
这项研究提出了开发下一代高性能,无重金属LED的有希望的策略.