Controlling structure and composition in double-heterojunction nanorods for high quantum yield and tunable color

Limitations of colloidal semiconductor double-heterojunction nanorods reported thus far are low photoluminescence quantum yield, low color purity owing to wide size distribution, and emission over a narrow range of energies in the visible spectrum. Here we report alterations to the synthetic route which result in a narrow size and morphological distribution of CdS nanorod seeds tunable over a range of lengths from 10 – 50 nm and quantum-confined bandgaps between 2.62 – 2.78 eV. Variously sized CdS seeds are then used to investigate the effects of the rate of Zn-Oleate etching and of the rate and amount of ZnSe growth on DHNR morphology and optical properties. Structure and composition are investigated by TEM. Each are shown to depend sensitively on the synthetic route. We ultimately demonstrate DHNR with emission wavelength tunable between 2.04 - 2.16 eV, photoluminescence quantum yield up to 68%, and full width at half maximum photoluminescence as low as 84 meV.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Materials Science & Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2017

Author dc:creator

• Drake, Gryphon Aubrey

Contributors dc:contributor

• Shim, Moonsub

• Nanoparticle synthesis
• Quantum dots
• Double-heterojunction nanorods

Statement dc:rights

• Copyright 2017 Gryphon Drake

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/98310

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/98310