Efficient colloidal quantum dot light-emitting diodes operating in the second near-infrared biological window

Maria Vasilopoulou, Hyeong Pil Kim, Byung Soon Kim, Michael Papadakis, Anderson Emanuel Ximim Gavim, Andreia Gerniski Macedo, Wilson Jose da Silva, Fabio Kurt Schneider, Mohd Asri Mat Teridi, Athanassios G. Coutsolelos, Abd Rashid bin Mohd Yusoff

Research output: Contribution to journalArticle

Abstract

Semiconductor colloidal quantum dots (CQDs) offer size- and composition-tunable luminescence of high colour purity. Importantly, their emission can be tuned deep into the second biological near-infrared (NIR-II) window (1,000–1,700 nm). However, applications are hindered by the low efficiencies achieved to date. Here, we report NIR-II CQD light-emitting diodes with an external quantum efficiency of 16.98% and a power conversion efficiency of 11.28% at wavelength 1,397 nm. This performance arises from device engineering that delivers a high photoluminescence quantum yield and charge balance close to unity. More specifically, we employed a binary emissive layer consisting of silica-encapsulated silver sulfide (Ag2S@SiO2) CQDs dispersed in a caesium-containing triple cation perovskite matrix that serves as an additional passivation medium and a carrier supplier to the emitting CQDs. The hole-injection contact also features a thin porphyrin interlayer to balance the device current and enhance carrier radiative recombination.

Original languageEnglish
JournalNature Photonics
DOIs
Publication statusAccepted/In press - 1 Jan 2019

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Semiconductor quantum dots
Light emitting diodes
light emitting diodes
quantum dots
Infrared radiation
Cesium
Porphyrins
Quantum yield
radiative recombination
Quantum efficiency
Passivation
cesium
porphyrins
Silicon Dioxide
Perovskite
passivity
Conversion efficiency
Cations
Luminescence
sulfides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Vasilopoulou, M., Kim, H. P., Kim, B. S., Papadakis, M., Ximim Gavim, A. E., Macedo, A. G., ... bin Mohd Yusoff, A. R. (Accepted/In press). Efficient colloidal quantum dot light-emitting diodes operating in the second near-infrared biological window. Nature Photonics. https://doi.org/10.1038/s41566-019-0526-z

Efficient colloidal quantum dot light-emitting diodes operating in the second near-infrared biological window. / Vasilopoulou, Maria; Kim, Hyeong Pil; Kim, Byung Soon; Papadakis, Michael; Ximim Gavim, Anderson Emanuel; Macedo, Andreia Gerniski; Jose da Silva, Wilson; Schneider, Fabio Kurt; Mat Teridi, Mohd Asri; Coutsolelos, Athanassios G.; bin Mohd Yusoff, Abd Rashid.

In: Nature Photonics, 01.01.2019.

Research output: Contribution to journalArticle

Vasilopoulou, M, Kim, HP, Kim, BS, Papadakis, M, Ximim Gavim, AE, Macedo, AG, Jose da Silva, W, Schneider, FK, Mat Teridi, MA, Coutsolelos, AG & bin Mohd Yusoff, AR 2019, 'Efficient colloidal quantum dot light-emitting diodes operating in the second near-infrared biological window', Nature Photonics. https://doi.org/10.1038/s41566-019-0526-z
Vasilopoulou, Maria ; Kim, Hyeong Pil ; Kim, Byung Soon ; Papadakis, Michael ; Ximim Gavim, Anderson Emanuel ; Macedo, Andreia Gerniski ; Jose da Silva, Wilson ; Schneider, Fabio Kurt ; Mat Teridi, Mohd Asri ; Coutsolelos, Athanassios G. ; bin Mohd Yusoff, Abd Rashid. / Efficient colloidal quantum dot light-emitting diodes operating in the second near-infrared biological window. In: Nature Photonics. 2019.
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