Thermally robust and blinking suppressed core/graded-shell CdSe/CdSe 1-xSx/CdS 'giant' multishell semiconductor nanocrystals

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We demonstrate that core/graded-shell CdSe/CdSe1-xS x/CdS giant semiconductor nanocrystals (g-NCs) have robust photoluminescence (PL) temperature response. At a size of 10.2 nm in diameter, these g-NCs undergo a PL drop of only 30% at 355 K relative to their PL intensity at 85 K. In comparison, the core/step-shell CdSe/CdS g-NCs at the same diameter exhibit 80% PL drop at 355 K. Spectral shifting and broadening were found to be, respectively, 5-10 times and 2-4 times smaller than those observed in standard CdSe core and CdSe/CdS core/shell NCs. These core/graded-shell g-NCs are largely blinking suppressed and have insignificant photoluminescence decay even after excitation at very high irradiance (44 kW cm-2) for over an hour. These types of g-NC have potential applications as the active medium for thermally robust laser devices (in the visible range) or as temperature-insensitive bioprobes for biomedical imaging.

Original languageEnglish (US)
Article number475705
JournalNanotechnology
Volume24
Issue number47
DOIs
StatePublished - Nov 29 2013

Fingerprint

Nanocrystals
Photoluminescence
Semiconductor materials
Imaging techniques
Temperature
Lasers

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

@article{a69de80d9d08471f9b85315f6ad3a39f,
title = "Thermally robust and blinking suppressed core/graded-shell CdSe/CdSe 1-xSx/CdS 'giant' multishell semiconductor nanocrystals",
abstract = "We demonstrate that core/graded-shell CdSe/CdSe1-xS x/CdS giant semiconductor nanocrystals (g-NCs) have robust photoluminescence (PL) temperature response. At a size of 10.2 nm in diameter, these g-NCs undergo a PL drop of only 30{\%} at 355 K relative to their PL intensity at 85 K. In comparison, the core/step-shell CdSe/CdS g-NCs at the same diameter exhibit 80{\%} PL drop at 355 K. Spectral shifting and broadening were found to be, respectively, 5-10 times and 2-4 times smaller than those observed in standard CdSe core and CdSe/CdS core/shell NCs. These core/graded-shell g-NCs are largely blinking suppressed and have insignificant photoluminescence decay even after excitation at very high irradiance (44 kW cm-2) for over an hour. These types of g-NC have potential applications as the active medium for thermally robust laser devices (in the visible range) or as temperature-insensitive bioprobes for biomedical imaging.",
author = "Lau, {Pick Chung} and Zhaozhao Zhu and Norwood, {Robert A} and Masud Mansuripur and Peyghambarian, {Nasser N}",
year = "2013",
month = "11",
day = "29",
doi = "10.1088/0957-4484/24/47/475705",
language = "English (US)",
volume = "24",
journal = "Nanotechnology",
issn = "0957-4484",
publisher = "IOP Publishing Ltd.",
number = "47",

}

TY - JOUR

T1 - Thermally robust and blinking suppressed core/graded-shell CdSe/CdSe 1-xSx/CdS 'giant' multishell semiconductor nanocrystals

AU - Lau, Pick Chung

AU - Zhu, Zhaozhao

AU - Norwood, Robert A

AU - Mansuripur, Masud

AU - Peyghambarian, Nasser N

PY - 2013/11/29

Y1 - 2013/11/29

N2 - We demonstrate that core/graded-shell CdSe/CdSe1-xS x/CdS giant semiconductor nanocrystals (g-NCs) have robust photoluminescence (PL) temperature response. At a size of 10.2 nm in diameter, these g-NCs undergo a PL drop of only 30% at 355 K relative to their PL intensity at 85 K. In comparison, the core/step-shell CdSe/CdS g-NCs at the same diameter exhibit 80% PL drop at 355 K. Spectral shifting and broadening were found to be, respectively, 5-10 times and 2-4 times smaller than those observed in standard CdSe core and CdSe/CdS core/shell NCs. These core/graded-shell g-NCs are largely blinking suppressed and have insignificant photoluminescence decay even after excitation at very high irradiance (44 kW cm-2) for over an hour. These types of g-NC have potential applications as the active medium for thermally robust laser devices (in the visible range) or as temperature-insensitive bioprobes for biomedical imaging.

AB - We demonstrate that core/graded-shell CdSe/CdSe1-xS x/CdS giant semiconductor nanocrystals (g-NCs) have robust photoluminescence (PL) temperature response. At a size of 10.2 nm in diameter, these g-NCs undergo a PL drop of only 30% at 355 K relative to their PL intensity at 85 K. In comparison, the core/step-shell CdSe/CdS g-NCs at the same diameter exhibit 80% PL drop at 355 K. Spectral shifting and broadening were found to be, respectively, 5-10 times and 2-4 times smaller than those observed in standard CdSe core and CdSe/CdS core/shell NCs. These core/graded-shell g-NCs are largely blinking suppressed and have insignificant photoluminescence decay even after excitation at very high irradiance (44 kW cm-2) for over an hour. These types of g-NC have potential applications as the active medium for thermally robust laser devices (in the visible range) or as temperature-insensitive bioprobes for biomedical imaging.

UR - http://www.scopus.com/inward/record.url?scp=84887588316&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84887588316&partnerID=8YFLogxK

U2 - 10.1088/0957-4484/24/47/475705

DO - 10.1088/0957-4484/24/47/475705

M3 - Article

C2 - 24177005

AN - SCOPUS:84887588316

VL - 24

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 47

M1 - 475705

ER -