Enhanced Photoluminescence Quantum Yield of Colloidal MoS2 Quantum Dots by Optimization of Oleic Acid and Oleylamine for Light-Emitting Diode Applications

Lambora, S and Bhardwaj, A (2024) Enhanced Photoluminescence Quantum Yield of Colloidal MoS2 Quantum Dots by Optimization of Oleic Acid and Oleylamine for Light-Emitting Diode Applications. In: ACS Applied Nano Materials, 7 (1). pp. 163-169.

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Abstract

In this study, we investigate the impact of oleic acid and oleylamine on the photoluminescence quantum yield (PLQY) and size distribution of MoS2 quantum dots (QDs) synthesized by using the colloidal heating method. The optical characteristics of MoS2 QDs are found to be dependent on OAc/OAm (mL/mL) concentrations, which are (0 mL/0 mL), (0 mL/3 mL), (3 mL/0 mL), (3 mL/3 mL), (3 mL/6 mL), and (6 mL/3 mL). The optimal amount of OAc is obtained to be 3 mL with a high PLQY and narrow size distribution of QDs with an average diameter of �3 nm. A maximum PLQY of 12.32 is measured for (3 mL/0 mL) QDs with blue emission showing PL maxima at �440 nm, while for (3 mL/3 mL) and (3 mL/6 mL), the measured PLQY values are 9.12 and 7.00, respectively. For the remaining OAc/OAm combinations, the measured PLQY value is �3 with wide-size distributions. Morphological analysis using a transmission electron microscope reveals the spherical QD formation for all the different OAc/OAm combinations. FTIR results show the presence of C-H, C�O, C�C, and C-N, confirming OAc and OAm coverage on the MoS2 QD surface. We report the highest achieved PLQY of 12.32 for colloidally synthesized blue-emitting MoS2 QDs. With high PLQY, these QDs can find applications in light-emitting diode fabrication, sensing, and bioimaging. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Nano Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to Publisher.
Keywords:	Layered semiconductors; Molybdenum compounds; Nanocrystals; Oleic acid; Organic light emitting diodes (OLED); Photoluminescence; Semiconductor quantum dots; Size distribution; Transmission electron microscopy, Heating method; Lightemitting diode; Oleylamine; Optical characteristics; Optimisations; Photoluminescence quantum yields; Quantum size; Size-distribution; Synthesised; Yield value, Quantum yield
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	01 Mar 2024 07:26
Last Modified:	01 Mar 2024 07:26
URI:	https://eprints.iisc.ac.in/id/eprint/83933

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