Ba3Y2WO9:Mn4+: A near-UV and yellow-green light excited red phosphor for greenhouse cultivation

Ba3Y2WO9:Mn4+: A near-UV and yellow-green light excited red phosphor for greenhouse cultivation
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Ba3Y2WO9:Mn4:一种用于温室栽培的近紫外和黄绿光激发红色荧光粉

DOI:
10.1016/j.jlumin.2020.117406
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发表时间:
2020-09
影响因子:
3.6
通讯作者:
肖思国
肖思国
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
王文波;阳效良;肖思国

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采用高温固相反应法制备了Mn ~(4+)激活的双钙钛矿结构Ba_3Y_2WO_9荧光粉。该荧光粉可以发射位于~692 nm的红色发射,这与叶绿素和光敏色素在红光范围内的吸收光谱有很大重叠。由O2-→ Mn 4+电荷转移和Mn 4+的4A 2g → 4 T1 g跃迁形成的强激发带位于~367 nm,由4A 2g → 4 T2 g跃迁形成的次强激发带位于黄绿光区(~535 nm)。荧光粉的激发和发射性能表明其在温室栽培用转光膜/玻璃中的潜在应用,因为它不仅可以将紫外光,而且可以将黄绿光转换为红光发射。Mn ~(4+)在Ba_3Y_2WO_9基质中的最佳掺杂浓度为0.3mol%,超过此浓度时,Mn ~(4+)离子间基于d-d相互作用的能量转移导致荧光猝灭。此外,还对样品的晶场强度和热稳定性进行了讨论。
A novel Mn4+-activated Ba3Y2WO9phosphor of double perovskite structure has been prepared via high-temperature solid-state reaction method. The phosphor can emit red emission located at ~692 nm, which greatly overlaps with the absorption spectra of chlorophyll and phytochrome in the red light range. the intensest excitation band of the phosphor originating in the O2−→Mn4+charge transfer and the4A2g→4T1gof Mn4+centres at ~367 nm, while the sub intense excitation band formed by4A2g→4T2gtransition is located in the yellow-green light region (~535 nm). The excitation and emission performance of the phosphor indicates its potential application in light-conversion film/glass for greenhouse cultivation since it can convert not only UV but also yellow-green light into red emission. The optimal doping concentration of Mn4+in the Ba3Y2WO9host is 0.3 mol%, beyond which energy transfer between Mn4+ions based on d-d interaction results in fluorescence quenching. Besides, the crystal field strength and thermal stability of the sample are also discussed.
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