Structural control of InP/ZnS core/shell quantum dots enables high-quality white LEDs

Kumar, Baskaran Ganesh and Sadeghi, Sadra and Melikov, Rustamzhon and Mohammadi Aria, Mohammad and Bahmani Jalali, Houman and Ow-Yang, Cleva W. and Nizamoğlu, Sedat (2018) Structural control of InP/ZnS core/shell quantum dots enables high-quality white LEDs. Nanotechnology, 29 (34). ISSN 0957-4484 (Print) 1361-6528 (Online)

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Abstract

Herein, we demonstrate that the structural and optical control of InP-based quantum dots (QDs) can lead to high-performance light-emitting diodes (LEDs). Zinc sulphide (ZnS) shells passivate the InP QD core and increase the quantum yield in green-emitting QDs by 13-fold and redemitting QDs by 8-fold. The optimised QDs are integrated in the liquid state to eliminate aggregation-induced emission quenching and we fabricated white LEDs with a warm, neutral and cool-white appearance by the down-conversion mechanism The QD-functionalized white LEDs achieve luminous efficiency (LE) up to 14.7 lm W-1 and colour-rendering index up to 80. The structural and optical control of InP/ZnS core/shell QDs enable 23-fold enhancement in LE of white LEDs compared to ones containing only QDs of InP core.
Item Type: Article
Uncontrolled Keywords: LED; quantum dot; synthesis; nanoparticles; lighting
Subjects: T Technology > T Technology (General)
Q Science > QD Chemistry
Q Science > QC Physics
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences
Depositing User: Cleva W. Ow-Yang
Date Deposited: 15 Aug 2018 22:09
Last Modified: 22 May 2019 14:04
URI: https://research.sabanciuniv.edu/id/eprint/34968

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