Bright Type II Quantum Dots

Christina M. Tyrakowski, Armen Shamirian, Clare E. Rowland, Hongyan Shen, Adita Das, Richard D Schaller, Preston T. Snee

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

It is a paradigm that the exciton splitting characteristics of type II quantum dots (QDs) result in low quantum yield materials. However, reported herein is the synthesis of ZnSe/CdS/ZnS type II QDs with quantum yields as high as 61%. Most interesting is the fact that the enhancement in brightness is due to an increase in the radiative rate, rather than the suppression of surface trap-related nonradiative processes, which was found to be minimal. These QDs have been water-solubilized using two different methods and retain a substantial fraction of their brightness. The water-soluble type II QDs were conjugated to a dye to examine their potential as fluorescence resonance energy transfer (FRET) donors. A significant FRET efficiency of 61 ± 3% was measured using time-correlated single photon counting, which demonstrates the potential for these materials to be used in FRET-based chemical and biological sensing applications.

Original languageEnglish
Pages (from-to)7276-7281
Number of pages6
JournalChemistry of Materials
Volume27
Issue number21
DOIs
Publication statusPublished - Nov 10 2015

Fingerprint

Semiconductor quantum dots
Quantum yield
Luminance
Water
Excitons
Coloring Agents
Photons
Dyes
Fluorescence Resonance Energy Transfer

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Tyrakowski, C. M., Shamirian, A., Rowland, C. E., Shen, H., Das, A., Schaller, R. D., & Snee, P. T. (2015). Bright Type II Quantum Dots. Chemistry of Materials, 27(21), 7276-7281. https://doi.org/10.1021/acs.chemmater.5b02040

Bright Type II Quantum Dots. / Tyrakowski, Christina M.; Shamirian, Armen; Rowland, Clare E.; Shen, Hongyan; Das, Adita; Schaller, Richard D; Snee, Preston T.

In: Chemistry of Materials, Vol. 27, No. 21, 10.11.2015, p. 7276-7281.

Research output: Contribution to journalArticle

Tyrakowski, CM, Shamirian, A, Rowland, CE, Shen, H, Das, A, Schaller, RD & Snee, PT 2015, 'Bright Type II Quantum Dots', Chemistry of Materials, vol. 27, no. 21, pp. 7276-7281. https://doi.org/10.1021/acs.chemmater.5b02040
Tyrakowski CM, Shamirian A, Rowland CE, Shen H, Das A, Schaller RD et al. Bright Type II Quantum Dots. Chemistry of Materials. 2015 Nov 10;27(21):7276-7281. https://doi.org/10.1021/acs.chemmater.5b02040
Tyrakowski, Christina M. ; Shamirian, Armen ; Rowland, Clare E. ; Shen, Hongyan ; Das, Adita ; Schaller, Richard D ; Snee, Preston T. / Bright Type II Quantum Dots. In: Chemistry of Materials. 2015 ; Vol. 27, No. 21. pp. 7276-7281.
@article{aaa303ea5bc5428ea6e6304b2056047a,
title = "Bright Type II Quantum Dots",
abstract = "It is a paradigm that the exciton splitting characteristics of type II quantum dots (QDs) result in low quantum yield materials. However, reported herein is the synthesis of ZnSe/CdS/ZnS type II QDs with quantum yields as high as 61{\%}. Most interesting is the fact that the enhancement in brightness is due to an increase in the radiative rate, rather than the suppression of surface trap-related nonradiative processes, which was found to be minimal. These QDs have been water-solubilized using two different methods and retain a substantial fraction of their brightness. The water-soluble type II QDs were conjugated to a dye to examine their potential as fluorescence resonance energy transfer (FRET) donors. A significant FRET efficiency of 61 ± 3{\%} was measured using time-correlated single photon counting, which demonstrates the potential for these materials to be used in FRET-based chemical and biological sensing applications.",
author = "Tyrakowski, {Christina M.} and Armen Shamirian and Rowland, {Clare E.} and Hongyan Shen and Adita Das and Schaller, {Richard D} and Snee, {Preston T.}",
year = "2015",
month = "11",
day = "10",
doi = "10.1021/acs.chemmater.5b02040",
language = "English",
volume = "27",
pages = "7276--7281",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "21",

}

TY - JOUR

T1 - Bright Type II Quantum Dots

AU - Tyrakowski, Christina M.

AU - Shamirian, Armen

AU - Rowland, Clare E.

AU - Shen, Hongyan

AU - Das, Adita

AU - Schaller, Richard D

AU - Snee, Preston T.

PY - 2015/11/10

Y1 - 2015/11/10

N2 - It is a paradigm that the exciton splitting characteristics of type II quantum dots (QDs) result in low quantum yield materials. However, reported herein is the synthesis of ZnSe/CdS/ZnS type II QDs with quantum yields as high as 61%. Most interesting is the fact that the enhancement in brightness is due to an increase in the radiative rate, rather than the suppression of surface trap-related nonradiative processes, which was found to be minimal. These QDs have been water-solubilized using two different methods and retain a substantial fraction of their brightness. The water-soluble type II QDs were conjugated to a dye to examine their potential as fluorescence resonance energy transfer (FRET) donors. A significant FRET efficiency of 61 ± 3% was measured using time-correlated single photon counting, which demonstrates the potential for these materials to be used in FRET-based chemical and biological sensing applications.

AB - It is a paradigm that the exciton splitting characteristics of type II quantum dots (QDs) result in low quantum yield materials. However, reported herein is the synthesis of ZnSe/CdS/ZnS type II QDs with quantum yields as high as 61%. Most interesting is the fact that the enhancement in brightness is due to an increase in the radiative rate, rather than the suppression of surface trap-related nonradiative processes, which was found to be minimal. These QDs have been water-solubilized using two different methods and retain a substantial fraction of their brightness. The water-soluble type II QDs were conjugated to a dye to examine their potential as fluorescence resonance energy transfer (FRET) donors. A significant FRET efficiency of 61 ± 3% was measured using time-correlated single photon counting, which demonstrates the potential for these materials to be used in FRET-based chemical and biological sensing applications.

UR - http://www.scopus.com/inward/record.url?scp=84946866674&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84946866674&partnerID=8YFLogxK

U2 - 10.1021/acs.chemmater.5b02040

DO - 10.1021/acs.chemmater.5b02040

M3 - Article

AN - SCOPUS:84946866674

VL - 27

SP - 7276

EP - 7281

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 21

ER -