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Title

Highly Efficient Transparent Nanophosphor Films for Tunable White-Light-Emitting Layered Coatings

AuthorsGeng, Dongling; Lozano, Gabriel CSIC ORCID; Míguez, Hernán CSIC ORCID
KeywordsRare-earth nanocrystals
Nanophosphors
White-light emission
Phosphor materials
Transparent coatings
Issue Date2019
PublisherAmerican Chemical Society
CitationACS Applied Materials and Interfaces 11: 4219- 4225 (2019)
AbstractBright luminescence in rare-earth (RE) nanocrystals, the so-called nanophosphors, is generally achieved by choosing a host that enables an effective excitation of the RE activator through charge or energy transfer. Although tungstate, molybdate, or vanadate compounds provide the aforementioned transfer, a comparative analysis of the efficiency of such emitters remains elusive. Herein, we perform a combined structural and optical analysis, which reveals that the tetragonal GdVO matrix gives rise to the highest efficiency among the different transparent nanophosphor films compared. Then, we demonstrate that by a sequential stacking of optical quality layers made of Eu- and Dy-doped nanocrystals, it is possible to attain highly transparent white-light-emitting coatings of tunable shade with photoluminescence quantum yields above 35%. Layering provides a precise dynamic tuning of the chromaticity based on the photoexcitation wavelength dependence of the emission of the nanophosphor ensemble without altering the chemical composition of the emitters or degrading their efficiency. The total extinction of the incoming radiation along with the high quantum yields achieved makes these thin-layered phosphors one of the most efficient transparent white converter coatings ever developed.
URIhttp://hdl.handle.net/10261/183788
DOI10.1021/acsami.8b17368
Identifiersdoi: 10.1021/acsami.8b17368
issn: 1944-8252
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