Efficient Near-Infrared Polymer Nanocrystal Light-Emitting Diodes

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Science  22 Feb 2002:
Vol. 295, Issue 5559, pp. 1506-1508
DOI: 10.1126/science.1068153

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Conjugated polymers and indium arsenide–based nanocrystals were used to create near-infrared plastic light-emitting diodes. Emission was tunable from 1 to 1.3 micrometers—a range that effectively covers the short-wavelength telecommunications band—by means of the quantum confinement effects in the nanocrystals. The external efficiency value (photons out divided by electrons in) is ∼0.5% (that is, >1% internal) and is mainly limited by device architecture. The near-infrared emission did not overlap the charge-induced absorption bands of the polymer.

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