Publication: Quantum dot to nanorod transition for efficient white-light-emitting diodes with suppressed absorption losses
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Melikov, Rustamzhon
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NO
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Abstract
Colloidal nanocrystals have great potential for next-generation solid-state lighting due to their outstanding emission and absorption tunability via size and morphology, narrow emission linewidth, and high photoluminescence quantum yield (PLQY). However, the losses due to self-and interabsorption among multitudes of nanocrystals significantly decrease external quantum yield levels of light-emitting diodes (LEDs). Here, we demonstrate efficient white LEDs via CdSe/CdS dot to ""dot-in-rod"" transition that enabled a large Stokes shift of 780 meV and significantly reduced absorption losses when used in conjunction with near-unity PLQY ZnCdSe/ZnSe quantum dots (QDs) emitting at the green spectral range. The optimized incorporation of nanocrystals in a liquid state led to the white LEDs with an ultimate external quantum efficiency (EQE) of 42.9%, with a net increase of EQE of 10.3% in comparison with white LEDs using CdSe/CdS dots. Therefore, combinations of nanocrystals with different nanomorphologies hold high promise for efficient white LEDs.
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American Chemical Society (ACS)
Subject
Nanoscience and nanotechnology, Materials science, multidisciplinary, Optics, Physics, applied, Physics, condensed matter
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Has Part
Source
ACS Photonics
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DOI
10.1021/acsphotonics.2c00555