Near-infrared electroluminescent devices based on colloidal HgTe quantum dot arrays

O'Connor, É.; O'Riordan, A.; Doyle, H.; Moynihan, S.; Cuddihy, A.; Redmond, G.
May 2005
Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p201114
Academic Journal
Crystalline 4.6 nm HgTe quantum dots, stabilized by 1-thioglycerol ligands, were synthesized by wet chemical methods. Room-temperature photoluminescence spectra of the dots, both in solution and as solid arrays, exhibited near-infrared emission. Light-emitting devices were fabricated by deposition of quantum dot layers onto glass/indium tin oxide (ITO)/3,4-polyethylene-dioxythiophene-polystyrene sulfonate (PEDOT) substrates followed by top contacting with evaporated aluminum. Room-temperature near-infrared electroluminescence from 1 mm2 ITO/PEDOT/HgTe/Al devices, centered at ∼1600 nm, with an external quantum efficiency of 0.02% and brightness of 150 nW/mm2 at 50 mA and 2.5 V was achieved.


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