A Selective Replacement Strategy to a Deep-Red Phosphor for Plant Growth and Optical Temperature Sensing
Journal of alloys and compounds(2022)
摘要
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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关键词
Photoluminescence,Phosphor,Plant growth,Optical temperature sensing
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