Details

Autor(en) / Beteiligte

• Gao, Liang
• Quan Li Na
• García de Arquer F Pelayo
• Zhao Yongbiao
• Rahim, Munir
• Proppe, Andrew
• Quintero-Bermudez, Rafael
• Zou Chengqin
• Yang, Zhenyu
• Saidaminov, Makhsud I
• Voznyy Oleksandr
• Kinge Sachin
• Lu, Zhenghong
• Kelley, Shana O
• Amassian Aram
• Tang, Jiang
• Sargent, Edward H

Titel

Efficient near-infrared light-emitting diodes based on quantum dots in layered perovskite

Ist Teil von

• Nature photonics, 2020-04, Vol.14 (4), p.227-233

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2020

Quelle

Springer Nature - Connect here FIRST to enable access

Beschreibungen/Notizen

• Light-emitting diodes (LEDs) based on excitonic material systems, in which tightly bound photoexcited electron–hole pairs migrate together rather than as individual charge carriers, offer an attractive route to developing solution-processed, high-performance light emitters. Here, we demonstrate bright, efficient, excitonic infrared LEDs through the incorporation of quantum dots (QDs)1 into a low-dimensional perovskite matrix. We program the surface of the QDs to trigger fast perovskite nucleation to achieve homogeneous incorporation of QDs into the matrix without detrimental QD aggregation, as verified by in situ grazing incidence wide-angle X-ray spectroscopy. We tailor the distribution of the perovskites to drive balanced ultrafast excitonic energy transfer to the QDs. The resulting LEDs operate in the short-wavelength infrared region, an important regime for imaging and sensing applications, and exhibit a high external quantum efficiency of 8.1% at 980 nm at a radiance of up to 7.4 W Sr−1 m−2.Embedding perovskite quantum dots in perovskite leads to bright, efficient 980 nm LEDs with applications in imaging and sensing.