Abstract

Monophasic NaYF4:Er3+/Yb3+ crystals were synthesized via the microwave-assisted hydrothermal route at 180°C. Microwave heating during the hydrothermal process substantially reduces the duration of reaction for the formation of cubic-NaYF4:Er3+/Yb3+ nanocrystals from 6 h to 30 min. As the duration of the reaction increases, cubic-NaYF4:Er3+/Yb3+ nanocrystals are transformed to uniform hexagonal-NaYF4:Er3+/Yb3+ microprisms because of the enhanced reaction kinetics. Bright upconverted emission from the NaYF4:Er3+/Yb3+ crystal, obtained by the efficient two-photon excitation, is related to crystal structure and morphology. The hexagonal microprisms exhibit better upconversion and are employed in security applications.

© 2016 Optical Society of America

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Corrections

20 June 2017: A typographical correction was made to the author affiliations.


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