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Review

Nanophosphors-Based White Light Sources

1
Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, prov.le Via Arnesano, 73100 Lecce, Italy
2
Department of Physics, Boston College, Chestnut Hill, MA 02215, USA
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 1048; https://doi.org/10.3390/nano9071048
Received: 4 July 2019 / Revised: 14 July 2019 / Accepted: 17 July 2019 / Published: 22 July 2019
(This article belongs to the Special Issue Luminescent Rare-Earth Based Nanomaterials)
Miniaturization requests and progress in nanofabrication are prompting worldwide interest in nanophosphors as white-emission mercury-free lighting sources. By comparison with their bulk counterparts, nanophosphors exhibit reduced concentration quenching effects and a great potential to enhance luminescence efficiency and tunability. In this paper, the physics of the nanophoshors is overviewed with a focus on the impact of spatial confinement and surface-to-volume ratio on the luminescence issue, as well as rare earth-activated multicolor emission for white light (WL) output. In this respect, the prominently practiced strategies to achieve WL emission are single nanophosphors directly yielding WL by means of co-doping and superposition of the individual red, green, and blue emissions from different nanophosphors. Recently, a new class of efficient broadband WL emitting nanophosphors has been proposed, i.e., nominally un-doped rare earth free oxide (yttrium oxide, Y2O3) nanopowders and Cr transition metal-doped garnet nanocrystals. In regard to this unconventional WL emission, the main points are: it is strictly a nanoscale phenomenon, the presence of an emitting center may favor WL emission without being necessary for observing it, and, its inherent origin is still unknown. A comparison between such an unconventional WL emission and the existing literature is presented to point out its novelty and superior lighting performances. View Full-Text
Keywords: solid state lighting; white-light emission; size-dependent spectroscopy; nanophosphors; un-doped white-light emitters solid state lighting; white-light emission; size-dependent spectroscopy; nanophosphors; un-doped white-light emitters
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MDPI and ACS Style

Cesaria, M.; Di Bartolo, B. Nanophosphors-Based White Light Sources. Nanomaterials 2019, 9, 1048. https://doi.org/10.3390/nano9071048

AMA Style

Cesaria M, Di Bartolo B. Nanophosphors-Based White Light Sources. Nanomaterials. 2019; 9(7):1048. https://doi.org/10.3390/nano9071048

Chicago/Turabian Style

Cesaria, Maura, and Baldassare Di Bartolo. 2019. "Nanophosphors-Based White Light Sources" Nanomaterials 9, no. 7: 1048. https://doi.org/10.3390/nano9071048

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