Journal
NEW JOURNAL OF CHEMISTRY
Volume 43, Issue 15, Pages 5960-5971Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj00760a
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Funding
- DST-SERB project [EMR/2017/000228]
- IIT (ISM) project [FRS(50)/13-14/APH]
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Upconversion nanomaterials possess various unique properties, but they suffer from low emission efficiency, making them challenging for optical and security applications. In this work, Mg2+ ion enhanced upconversion emission of rod-like YMoO4:Er3+/Yb3+ nanocrystals synthesized via a hydrothermal method is reported. The influence of rare earth (Er3+) as well as non-rare earth (Mg2+) ion concentration on the upconversion emission of YMoO4:Er3+/Yb3+ was investigated at various laser pump powers and external temperatures upon light excitation at 980 nm. The codoping of Mg2+ ions into YMoO4:Er3+/Yb3+ has shown efficient enhancement in the green and red upconversion luminescence intensities which has been explained based on the structural and optical properties of the material. The emission-optimized materials were further investigated to understand the dependence of excitation power density on optical thermometry and nano-heating behaviour using the fluorescence intensity ratio technique from the two thermally coupled energy levels - H-2(11/2) and S-4(3/2) of Er3+ ions. Strikingly, the sensor sensitivity of the material was noticed to decrease upon increasing the excitation power from 7 to 66 W cm(-2) and a maximum thermal sensitivity (0.0137 K-1 at 308 K) was achieved at a low excitation power (19 W cm(-2)). Moreover, the laser-induced optical heating effect in the material was determined with different excitation power densities and the maximum temperature of the sample particles was calculated to be 470 K at 66 W cm(-2). The obtained results indicate the potential use of the Mg2+ co-doped YMoO4:Er3+/Yb3+ phosphor in color displays, temperature sensing and optical heaters, and provide insights into understanding the effect of laser excitation power on its upconversion luminescence and optical sensing properties.
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