Concentration and size dependence of peak wavelength shift on quantum dots in colloidal suspension

Benjamin S. Rinehart; Caroline G. L. Cao

doi:10.1117/1.OE.55.8.087106

19 August 2016 Concentration and size dependence of peak wavelength shift on quantum dots in colloidal suspension

Benjamin S. Rinehart, Caroline G. L. Cao

Author Affiliations +

Optical Engineering, Vol. 55, Issue 8, 087106 (August 2016). https://doi.org/10.1117/1.OE.55.8.087106

Abstract

Quantum dots (QDs) are semiconductor nanocrystals that have significant advantages over organic fluorophores, including their extremely narrow Gaussian emission bands and broad absorption bands. Thus, QDs have a wide range of potential applications, such as in quantum computing, photovoltaic cells, biological sensing, and electronics. For these applications, aliasing provides a detrimental effect on signal identification efficiency. This can be avoided through characterization of the QD fluorescence signals. Characterization of the emissivity of CdTe QDs as a function of concentration (1 to 10 mg/ml aqueous) was conducted on 12 commercially available CdTe QDs (emission peaks 550 to 730 nm). The samples were excited by a 50-mW 405-nm laser with emission collected via a free-space CCD spectrometer. All QDs showed a redshift effect as concentration increased. On average, the CdTe QDs exhibited a maximum shift of +35.6 nm at 10 mg/ml and a minimum shift of +27.24 nm at 1 mg/ml, indicating a concentration dependence for shift magnitude. The concentration-dependent redshift function can be used to predict emission response as QD concentration is changed in a complex system.

Citation Download Citation

Benjamin S. Rinehart and Caroline G. L. Cao "Concentration and size dependence of peak wavelength shift on quantum dots in colloidal suspension," Optical Engineering 55(8), 087106 (19 August 2016). https://doi.org/10.1117/1.OE.55.8.087106

Published: 19 August 2016

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available