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All-Inorganic Light-Emitting Diodes Based on Solution-Processed Nontoxic and Earth-Abundant Nanocrystals

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2 Author(s)
Bhaumik, S. ; Dept. of Solid State Phys., Indian Assoc. for the Cultivation of Sci., Kolkata, India ; Pal, A.J.

We fabricate and characterize light-emitting diodes (LEDs) based on thin-films of NiO, Mn-doped ZnS, and n-ZnO nanoparticles acting as hole-transporting, emitting, and electron-transporting layers, respectively. We vary the thickness of the individual layers and record current-voltage and luminance-current characteristics. By examining the fitting of the current-voltage characteristics of these all-inorganic LEDs, we find that the hole- and electron-transporting layers lower barrier heights for hole- and electron-injection from the respective electrodes that correspondingly improve electro-luminescence (EL) output. The photoluminescence emission of Mn-doped ZnS nanoparticles and EL emission of the LEDs resembled implying that excitons formed in the doped nanostructures followed by a radiative transition between d-states of Mn-ions.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:49 ,  Issue: 3 )