Journal
NEW JOURNAL OF PHYSICS
Volume 10, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/10/8/083035
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Funding
- EU PhOREMOST Network of Excellence (NoE) [511616]
- EU Marie Curie International Reintegration [MC-IRG MOON 021391]
- Scientific and Technical Research Council of Turkey (TUBITAK) [107E088, 107E297, 106E020, 104E114, 105E065, 105E066]
- European Science Foundation (ESF)
- Turkish National Academy of Sciences (TUBA)
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We propose and demonstrate the controlled modification and selective enhancement of surface-state emission in white-luminophor CdS nanocrystals (NCs) by plasmon-coupling them with proximal metal nanostructures. By carefully designing nano-Ag films to match their localized plasmon resonance spectrally with the surface-state emission peak of CdS NCs, we experimentally show that the surface- state emission is substantially enhanced in the visible wavelength, while the interband (band-edge) transition at the shorter wavelength far away from the plasmon resonance is simultaneously significantly suppressed. With such plasmon tuning and consequent strong plasmon coupling specifically for the surface- state transitions, the surface- state emission is made stronger than the band- edge emission. This corresponds to an enhancement factor of 12.7-fold in the ratio of the surface- state peak emission to the band- edge peak emission of the plasmon-coupled film sample compared with that in solution. Such a plasmonic engineering of surface- state emission in trap-rich CdS white nanoluminophors holds great promise for future solid-state lighting.
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