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Nanophosphors-Based White Light Sources

Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, prov.le Via Arnesano, 73100 Lecce, Italy
Department of Physics, Boston College, Chestnut Hill, MA 02215, USA
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 1048;
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.

AMA Style

Cesaria M, Di Bartolo B. Nanophosphors-Based White Light Sources. Nanomaterials. 2019; 9(7):1048.

Chicago/Turabian Style

Cesaria, Maura, and Baldassare Di Bartolo. 2019. "Nanophosphors-Based White Light Sources" Nanomaterials 9, no. 7: 1048.

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