Highly luminescent colloidal CdS quantum dots with efficient near-infrared electroluminescence in light-emitting diodes

Ashu Kumar Bansal, F Antolini, Shuyue Zhang, L Stroea, L Orlotani, M Lanzi, E Serra, S Allard, U Scherf, Ifor David William Samuel

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)
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Abstract

Quantum dots are of growing interest as emissive materials in light
emitting devices. Here first we report the formation of highly luminescent organic capped colloidal cadmium sulfide (CdS) nanoparticles having the highest photoluminescence quantum yield of 69% in solutions and 34% in neat thin films in the near-infrared range. Second, we also show efficient electroluminescence in the near-infrared from solution processed hybrid light emitting diodes (LEDs) based on such colloidal CdS quantum dots embedded in an organic semiconductor matrix forming a nanocomposite active layer. We also discuss the device structure and role of the doped active layer in efficiency improvement. With optimized active layer thickness and concentration of QDs, the device exhibits an external electroluminescence quantum efficiency of 0.62% at a peak emission wavelength of 760 nm, providing a route to solution processable flexible light sources for biosensors and medicine.
Original languageEnglish
Pages (from-to)1871-1880
JournalJournal of Physical Chemistry C
Volume120
Issue number3
Early online date14 Dec 2015
DOIs
Publication statusPublished - 28 Jan 2016

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