期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 43, 页码 11587-11592出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc04392b
关键词
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资金
- Zhejiang Provincial Natural Science Foundation of China [LD18F050001, LY17E020007]
- National Natural Science Foundation of China [51702306, 51472225]
Luminescent materials with negative thermal quenching effects show superior potentials in temperature sensing and anti-counterfeiting fields. Normally, smaller nanocrystals (NCs) with higher surface-to-volume ratios are used to achieve larger thermal-induced intensification of upconversion (UC) emission intensity. Herein, confining sensitizers and activators to the shell layer with two-dimensional space and introducing defect energy levels via doping low-valence ions are simultaneously applied to enhance the negative thermal quenching effect. By increasing the temperature from 293 K to 413 K, the integral UC emission intensity of 20Yb/2Er:NaGdF4 increases only by approximate to 2.2 times, whereas that of NaGdF4@20Ca/20Yb/2Er:NaGdF4 core-shell NCs with a similar particle size increases by approximate to 10.9 times.
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