期刊
ACS NANO
卷 14, 期 2, 页码 1577-1585出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b06663
关键词
perovskite; LED; nanophotonic wires; stability; bendability
类别
资金
- National Natural Science Foundation of China [51672231]
- Shen Zhen Science and Technology Innovation Commission [JCYJ20170818114107730]
- HKUST Fund of Nanhai [FSNH-18FYTRI01]
- Hong Kong Research Grant Council [16237816, 16309018]
- Center for 1D/2D Quantum Materials at HKUST
- State Key Laboratory on Advanced Displays and Optoelectronics at HKUST
Hybrid perovskites have emerged as promising candidates for highly efficient light-emitting diodes in the past few years due to their excellent crystallinity, high color purity, wide-range bandgap tunability, and solution processability. However, the reported device external quantum efficiency has not reached the level on par with that of conventional inorganic and organic light-emitting diodes. Moreover, device stability still needs substantial improvement. In this work, we demonstrate the fabrication of perovskite nanophotonic wire array-based light-emitting diodes with a capillary-effect-assisted template method. Compared with the planar control device, the nanostructured device demonstrates 45% improvement of external quantum efficiency from 11% to 16% owing to substantial enhancement on device light extraction efficiency verified by optical modeling. Intriguingly, it is also discovered that the nanostructured device possesses 3.89 times lifetime compared to the planar control device, due to effective template passivation. The results here have clearly shown that with a proper photonic device structure design, both the device performance and lifetime can be significantly improved.
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