Blue-Emitting Colloidal In1– x Ga x P Quantum Dots Synthesized in Molten Salt: Toward Blue QLEDs with Improved Stability

Abstract Colloidal quantum dots (QDs) are being actively explored for QD light-emitting diode (QD-LED) displays with high color purity and wide color gamut, high brightness, and low-cost, solution-based manufacturing. Heavy metal-free InP QDs have enabled red- and green-emitting QD LEDs with excellent device characteristics. However, the performance of blue QD-LEDs, required for completing the red, green, and blue (RGB) full color gamut, is lagging behind, which prompts searches for novel blue-emitting QDs. Here, we report the synthesis, computational modeling, and structural and spectroscopic studies of heavy metal-free blue-emitting core-shell QDs featuring 2.1 nm In1–xGaxP cores, colloidally synthesized in a molten inorganic salt, epitaxially coated with ZnS shells, and optimized surface treatments. The computational study suggests that the introduction of a ZnS shell induces mixing between core and shell electronic states, enhancing the direct-gap character of In1–xGaxP/ZnS QDs. The resulting In1–xGaxP/ZnS QDs show blue band-edge photo- and electroluminescence that can be fine-tuned around the technologically important region of 470 nm. This material holds strong promise for filling the blue gap in full-gamut QD-LED displays.

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Journal
Journal of the American Chemical Society
Published
2026-09-21
DOI
https://doi.org/10.1021/jacs.6c12687
Primary Topic
Quantum Dots Synthesis And Properties
Type
article
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Blue-Emitting Colloidal In1– x Ga x P Quantum Dots Synthesized in Molten Salt: Toward Blue QLEDs with Improved Stability

Richard D. Schaller, Da-Eun Yoon, Kailai Lin, Hogeun Chang et al.
Journal of the American Chemical Society
Quantum Dots Synthesis And Properties
article

Blue-Emitting Colloidal In1– x Ga x P Quantum Dots Synthesized in Molten Salt: Toward Blue QLEDs with Improved Stability

Richard D. Schaller, Da-Eun Yoon, Kailai Lin, Hogeun Chang, Ji Hyun Min, Eran Rabani, Dmitri V. Talapin, Robert F. Klie, Danial Zangeneh, Justin C. Ondry, Aritrajit Gupta, Yuan Liu, Yi‐Chen Chen, Jun Hyuk Chang, Jaeyong Lee, Jiayang Zhou
article en

Abstract

Abstract Colloidal quantum dots (QDs) are being actively explored for QD light-emitting diode (QD-LED) displays with high color purity and wide color gamut, high brightness, and low-cost, solution-based manufacturing. Heavy metal-free InP QDs have enabled red- and green-emitting QD LEDs with excellent device characteristics. However, the performance of blue QD-LEDs, required for completing the red, green, and blue (RGB) full color gamut, is lagging behind, which prompts searches for novel blue-emitting QDs. Here, we report the synthesis, computational modeling, and structural and spectroscopic studies of heavy metal-free blue-emitting core-shell QDs featuring 2.1 nm In1–xGaxP cores, colloidally synthesized in a molten inorganic salt, epitaxially coated with ZnS shells, and optimized surface treatments. The computational study suggests that the introduction of a ZnS shell induces mixing between core and shell electronic states, enhancing the direct-gap character of In1–xGaxP/ZnS QDs. The resulting In1–xGaxP/ZnS QDs show blue band-edge photo- and electroluminescence that can be fine-tuned around the technologically important region of 470 nm. This material holds strong promise for filling the blue gap in full-gamut QD-LED displays.

Journal of the American Chemical Society
Argonne National Laboratory (US), Lawrence Berkeley National Laboratory (US), University of California, San Francisco (US), Hebrew University of Jerusalem (IL), Samsung (South Korea) (KR), University of California System (US), University of Illinois Chicago (US), University of Chicago (US), Northwestern University (PH), University of California, Berkeley (US)
Industry, innovation and infrastructure
Openalex Percentile: Top 24%
Quantum Dots Synthesis And Properties
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