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

Baskaran Ganesh Kumar; Sadra Sadeghi; Rustamzhon Melikov; Mohammad Mohammadi Aria; Houman Bahmani Jalali; Cleva W Ow-Yang; Sedat Nizamoglu

doi:10.1088/1361-6528/aac8c9

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

Nanotechnology. 2018 Aug 24;29(34):345605. doi: 10.1088/1361-6528/aac8c9. Epub 2018 May 30.

Authors

Baskaran Ganesh Kumar¹, Sadra Sadeghi, Rustamzhon Melikov, Mohammad Mohammadi Aria, Houman Bahmani Jalali, Cleva W Ow-Yang, Sedat Nizamoglu

Affiliation

¹ Department of Electrical and Electronics Engineering, Koc University, Turkey.

PMID: 29846177
DOI: 10.1088/1361-6528/aac8c9

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 red-emitting 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.