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Current Applied Materials

Author(s): Yiran Jiao, Jun Liu, Fen Wang, Yuan Pu, Fuhong Cai* and Dan Wang*

DOI: 10.2174/2666731201666220128110046

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Green Synthesis of Deep Ultraviolet Response Nanophosphors with Tunable Full-visible-spectra Emission for Luminescent Temperature Sensing

Article ID: e280122200640 Pages: 8

  • * (Excluding Mailing and Handling)

Abstract

Background: Recently, the CaMoO4 nanocrystal has been viewed as one of the most promising substrates for rare-earth-doped nanophosphors due to its high density, stable chemical properties, and good deep-ultraviolet (DUV) responding characteristics.

Aim: In this work, a green synthesis approach is proposed to obtain rare-earth-doped CaMoO4 nanodispersion with full-visible-spectra emission by using an ethanol-water mixed solvent in a rotating packed bed (RPB) reactor.

Method: The obtained nanophosphors exhibited bright luminescent emission with tunable color in the range of full-visible-spectra via doping of Eu3+, Tb3+, and Dy3+, when they were excited by deepultraviolet (DUV) light. The RPB promoted the uniform distribution of rare-earth ions and the crystallinity of CaMoO4 particles, and the use of ethanol-water as solvents with no toxicity and less environmental pollution was beneficial for large-scale production.

Result: The quantum yields for nanophosphors of CaMoO4: Na+, Eu3+, CaMoO4: Na+, Tb3+, and Ca- MoO4: Na+, Dy3+ were measured to be 46.96 %, 28.05 %, and 10.27 %, respectively, which were among the highest values ever reported for rare-earth-doped CaMoO4-based nanophosphors with similar morphology. The temperature-dependent luminescence of CaMoO4: Eu3+, Na+ nanophosphors was investigated in the range of 298 K - 498 K.

Conclusion: The clear correlation between luminescence intensity and temperature indicates the potential novel application areas for CaMoO4: Na+, Eu3+ nanophosphor as a non-invasive thermometer. Upon regulating different nanophosphor material ratios, the obtained product shows a flexible fluorescence towards full-visible-spectra emission.

Keywords: Rotating packed bed, process intensification, nanodispersion, full-visible-spectra emission, temperature sensing, green solvent.

Graphical Abstract

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