Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 924, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166510
Keywords
Photoluminescence; Phosphor; Plant growth; Optical temperature sensing
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Funding
- National Natural Science Foundation of China [22075070]
- Program for Science & Technology Innovation Talents in Universities of Henan Province, China [22HASTIT003]
- Excellent Youth Fund of Henan Province, China [212300410044]
- Key research project of Henan Province Office of Education, China [21A150019]
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By synthesizing a new red phosphor SLA:xMn4+, plant growth can be promoted. In addition, SLA:0.006Mn4+, 0.006Dy3+ can also be used as a non-contact optical thermometer.
For the absorption of plants, it is important to synthesize phosphors with emission bands in the red region. Herein, a series of new red phosphors Sr1-xLa2+xAl2-xO7: xMn4+ (SLA: xMn4+) were synthesized by the high temperature solid-state reaction. The inconsistent charge number of Mn4+ dopant and substituted Al3+ ion can be compensated by manual adjusting of the proportion of Sr2+ and La3+ in the same crystallography site. The phosphor shows emission band at around 713 nm, which fits well with the absorption of Pfr (far-red light-absorbing phytochrome), meaning that the SLA: 0.006Mn4+ can promote plant growth. Furthermore, co-doped phosphor SLA: 0.006Mn4+, 0.006Dy3+ was prepared with interesting temperature-dependent luminescence. With temperature increasing, the emitting intensity of Mn4+ has a more pronounced decline in comparison with Dy3+. Due to this feature, SLA: 0.006Mn4+, 0.006Dy3+ can be used as a non-contact optical thermometer with Sa of 0.018 K-1 at 450 K and Sr of 1.458% K-1 at 425 K.(c) 2022 Published by Elsevier B.V.
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