Monophasic 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- nanocrystals from 6 h to 30 min. As the duration of the reaction increases, cubic- nanocrystals are transformed to uniform hexagonal- microprisms because of the enhanced reaction kinetics. Bright upconverted emission from the 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.
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20 June 2017: A typographical correction was made to the author affiliations.
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