A terbium-sensitized Eu3+-activated deep-red-emitting phosphor for plant growth LED application
A terbium-sensitized Eu3+-activated deep-red-emitting phosphor for plant growth LED application
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用于植物生长LED应用的铽敏化Eu3激活深红光荧光粉
DOI：
10.1016/j.jallcom.2021.160966
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发表时间：
2021-06-29
影响因子：
6.2
通讯作者：
Shi, Jianxin
中科院分区：
文献类型：
--
作者：
Li, Junhao;Lin, Litian;Shi, Jianxin
传统的Eu3+激活的无机荧光粉通常用于一般照明和显示，因为它们通常发出波长小于630 nm的强烈橙色(D-5(0)-F-7(1))或红色(D-5(0)-F-7(2))光。然而，鲜为人知或聚焦的是，具有特定对称性的位置上的Eu3+可以增强其D-5(0)-F-7(4)的跃迁，使Eu3+本身发射出比上述橙色和红色更强的深红色光(>；700 nm)。本文从石榴石结构出发，合成了一种新型的Eu3+激活的荧光粉Ca2TbSn2Al3O12：Eu3+。与其他Eu3+激活的荧光粉不同，Eu3+在基质中的D-5(0)-F-7(4)跃迁占主导地位，橙色、红色和深红色的发射是平衡的。Eu3+发光的这些特性主要满足植物对光敏色素(PFR和PR)的需求。此外，可以观察到从主体组成元素Tb3+到激活剂Eu3+的桥式能量转移。发现Tb~(3+)-Eu~(3+)的能量传递通过偶极-偶极相互作用机制，并通过对Eu~(3+)在Tb~(3+)激发下的衰减曲线的模拟，首次证实了Tb~(3+)桥能量传递的存在。对于Ca2Tb0.60Sn2Al3O12：0.40Eu(3+)，能量转移效率高达94.4%，发光颜色为全红。热猝灭研究表明，该荧光粉在425K时的发射强度保持了室温下初始强度的80%。通过用380 nm的LED芯片制作荧光粉，可以得到植物生长的LED器件。(C)2021年爱思唯尔B.V.保留所有权利。
Traditional Eu3+-activated inorganic phosphors are habitually used for general lighting and display because they generally emit either intense orange (D-5(0)-F-7(1)) or red (D-5(0)-F-7(2)) light whose wavelength is shorter than 630 nm. However, less known nor focused is that Eu3+ at sites with specific symmetry can intensify its D-5(0)-F-7(4) transition, enabling Eu3+ itself to emit deep red light (>700 nm) even stronger than the above orange and red ones. Herein, a novel Eu3+-activated phosphor, Ca2TbSn2Al3O12:Eu3+, is developed from the garnet structure. Differing from other Eu3+-activated phosphors, the D-5(0)-F-7(4) transition of Eu3+ in the host is dominant and the orange, red and deep red emissions are balanced. Such special features of Eu3+ lumi-nescence mainly meet the need of phytochromes (PFR and PR) in plants. Additionally, bridge style energy transfer from the host composition element Tb3+ to the activator Eu3+ can be observed. It is found the Tb3+-Eu3+ energy transfer here takes through the mechanism of dipole-dipole interaction and the simulation on decay curve of Eu3+ upon Tb3+ excitation, for the first time, confirms the existence of terbium bridge energy transfer. For the Ca2Tb0.60Sn2Al3O12:0.40Eu(3+), the energy transfer efficiency is as high as 94.4% and the emission color is totally red. Thermal quenching studies reveal that the emission intensity of the phosphor at 425 K sustains 80% of its initial intensity at room temperature. By fabricating the phosphor with a 380 nm LED chip, a plant-growth LED device can be obtained. (C) 2021 Elsevier B.V. All rights reserved.