Thermally robust and blinking suppressed core/graded-shell CdSe/CdSe1-xSx/CdS 'giant' multishell semiconductor nanocrystals
| Autor: | Nasser Peyghambarian, Masud Mansuripur, Robert A. Norwood, Pick Chung Lau, Zhaozhao Zhu |
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| Rok vydání: | 2013 |
| Předmět: |
Photoluminescence
Materials science business.industry Mechanical Engineering Drop (liquid) High irradiance Bioengineering General Chemistry Laser law.invention Mechanics of Materials law Visible range Semiconductor nanocrystals Optoelectronics General Materials Science Electrical and Electronic Engineering business Temperature response Excitation |
| Zdroj: | Nanotechnology. 24(47) |
| ISSN: | 1361-6528 |
| Popis: | We demonstrate that core/graded-shell CdSe/CdSe1-xSx/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. |
| Databáze: | OpenAIRE |
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