Confinement Effects and Charge Dynamics in Zn3N2 Colloidal Quantum Dots: Implications for QD-LED displaysCitation formats

  • External authors:
  • Simon Michael Fairclough
  • Peter Neil Taylor
  • Mark A Green
  • Rinku Saran

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Confinement Effects and Charge Dynamics in Zn3N2 Colloidal Quantum Dots: Implications for QD-LED displays. / Ahumada-lazo, Ruben; Fairclough, Simon Michael; Hardman, Samantha J. O.; Taylor, Peter Neil; Green, Mark A; Haigh, Sarah J.; Saran, Rinku; Curry, Richard; Binks, David J.

In: ACS Applied Nano Materials, 05.11.2019.

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@article{a31a0178a5624ffc8cee5e4f0a87c4ab,
title = "Confinement Effects and Charge Dynamics in Zn3N2 Colloidal Quantum Dots: Implications for QD-LED displays",
abstract = "Zinc nitride (Zn3N2) colloidal quantum dots are composed of non-toxic, low-cost and earth-abundant elements. The effects of quantum confinement on the optical properties and charge dynamics of these dots are studied using steady state optical characterization and ultrafast fluence-dependent transient ab-sorption. The absorption and emission energies are observed to be size tunable, with the optical band gap increasing from 1.5 eV to 3.2 eV as the dot diameter decreased from 8.9 nm to 2.7 nm. Size dependent absorption cross sections (σ = 1.22 ± 0.02 × 10-15 cm2 to 2.04 ± 0.03 × 10-15 cm2), single exciton lifetimes (0.36 ± 0.02 ns to 0.65 ± 0.03 ns), as well as Auger recombination lifetimes of biexcitons (3.2 ± 0.4 ps to 5.0 ± 0.1 ps) and trions (20.8 ± 1.8 ps to 46.3 ± 1.3 ps) are also measured. The degeneracy of the con-duction band minimum (푔 = 2) is determined from the analysis of the transient absorption spectra at different excitation fluences. The performance of Zn3N2 colloidal quantum dots thus broadly matches that of established visible light emitting quantum dots based on toxic or rare elements, making them a viable alternative for QD-LED displays.",
keywords = "quantum confinement, charge dynamics, zinc nitride, quantum dots, QD-LED",
author = "Ruben Ahumada-lazo and Fairclough, {Simon Michael} and Hardman, {Samantha J. O.} and Taylor, {Peter Neil} and Green, {Mark A} and Haigh, {Sarah J.} and Rinku Saran and Richard Curry and Binks, {David J.}",
year = "2019",
month = nov,
day = "5",
doi = "10.1021/acsanm.9b01714",
language = "English",
journal = "ACS Applied Nano Materials",
issn = "2574-0970",
publisher = "American Chemical Society",

}

RIS

TY - JOUR

T1 - Confinement Effects and Charge Dynamics in Zn3N2 Colloidal Quantum Dots: Implications for QD-LED displays

AU - Ahumada-lazo, Ruben

AU - Fairclough, Simon Michael

AU - Hardman, Samantha J. O.

AU - Taylor, Peter Neil

AU - Green, Mark A

AU - Haigh, Sarah J.

AU - Saran, Rinku

AU - Curry, Richard

AU - Binks, David J.

PY - 2019/11/5

Y1 - 2019/11/5

N2 - Zinc nitride (Zn3N2) colloidal quantum dots are composed of non-toxic, low-cost and earth-abundant elements. The effects of quantum confinement on the optical properties and charge dynamics of these dots are studied using steady state optical characterization and ultrafast fluence-dependent transient ab-sorption. The absorption and emission energies are observed to be size tunable, with the optical band gap increasing from 1.5 eV to 3.2 eV as the dot diameter decreased from 8.9 nm to 2.7 nm. Size dependent absorption cross sections (σ = 1.22 ± 0.02 × 10-15 cm2 to 2.04 ± 0.03 × 10-15 cm2), single exciton lifetimes (0.36 ± 0.02 ns to 0.65 ± 0.03 ns), as well as Auger recombination lifetimes of biexcitons (3.2 ± 0.4 ps to 5.0 ± 0.1 ps) and trions (20.8 ± 1.8 ps to 46.3 ± 1.3 ps) are also measured. The degeneracy of the con-duction band minimum (푔 = 2) is determined from the analysis of the transient absorption spectra at different excitation fluences. The performance of Zn3N2 colloidal quantum dots thus broadly matches that of established visible light emitting quantum dots based on toxic or rare elements, making them a viable alternative for QD-LED displays.

AB - Zinc nitride (Zn3N2) colloidal quantum dots are composed of non-toxic, low-cost and earth-abundant elements. The effects of quantum confinement on the optical properties and charge dynamics of these dots are studied using steady state optical characterization and ultrafast fluence-dependent transient ab-sorption. The absorption and emission energies are observed to be size tunable, with the optical band gap increasing from 1.5 eV to 3.2 eV as the dot diameter decreased from 8.9 nm to 2.7 nm. Size dependent absorption cross sections (σ = 1.22 ± 0.02 × 10-15 cm2 to 2.04 ± 0.03 × 10-15 cm2), single exciton lifetimes (0.36 ± 0.02 ns to 0.65 ± 0.03 ns), as well as Auger recombination lifetimes of biexcitons (3.2 ± 0.4 ps to 5.0 ± 0.1 ps) and trions (20.8 ± 1.8 ps to 46.3 ± 1.3 ps) are also measured. The degeneracy of the con-duction band minimum (푔 = 2) is determined from the analysis of the transient absorption spectra at different excitation fluences. The performance of Zn3N2 colloidal quantum dots thus broadly matches that of established visible light emitting quantum dots based on toxic or rare elements, making them a viable alternative for QD-LED displays.

KW - quantum confinement

KW - charge dynamics

KW - zinc nitride

KW - quantum dots

KW - QD-LED

U2 - 10.1021/acsanm.9b01714

DO - 10.1021/acsanm.9b01714

M3 - Article

JO - ACS Applied Nano Materials

JF - ACS Applied Nano Materials

SN - 2574-0970

ER -