Bright Type II Quantum Dots

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

doi:10.1021/acs.chemmater.5b02040

Bright Type II Quantum Dots

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

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

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 language	English (US)
Pages (from-to)	7276-7281
Number of pages	6
Journal	Chemistry of Materials
Volume	27
Issue number	21
DOIs	https://doi.org/10.1021/acs.chemmater.5b02040
State	Published - Nov 10 2015

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Materials Chemistry

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10.1021/acs.chemmater.5b02040

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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.",

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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.

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Bright Type II Quantum Dots

Abstract

ASJC Scopus subject areas

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