Mid-infrared HgTe Colloidal Quantum Dot LEDs.
basic_science · Level V
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- Record sourced from PubMed, PMID 35349280.
- Also identified by DOI 10.1021/acsnano.2c01694.
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Abstract
Mid-infrared HgTe colloidal quantum dot electroluminescent devices are demonstrated. With emission at 4 μm, devices achieved an external quantum efficiency of ∼10<sup>-3</sup> and power conversion efficiency of ∼10<sup>-4</sup> under biases of a few volts. The power conversion efficiency benefited from lowering the transparent electrode resistance through the incorporation of a metal conductive grid. The average power emitted was about 16 μW at 2 V bias with 50% duty cycle and a 1 mm<sup>2</sup> device. The room-temperature electroluminescence efficiency at low current was limited by the photoluminescence efficiency of the quantum dots, while the diode structure provided efficient electron-hole recombination.