Novel persistent phosphors of lanthanide–chromium co-doped yttrium aluminum gallium garnet: design concept with vacuum referred binding energy diagram
Novel persistent phosphors of lanthanide–chromium co-doped yttrium aluminum gallium garnet: design concept with vacuum referred binding energy diagram
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DOI：
10.1039/c6tc00802j
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发表时间：
2016-05
影响因子：
6.4
通讯作者：
Jian Xu;J. Ueda;S. Tanabe
中科院分区：
文献类型：
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作者：
Jian Xu;J. Ueda;S. Tanabe
我们研制了Pr3+-Cr3+和Tb3+-Cr3+共掺Y3Al2Ga3O12(YAGG)橙色(Pr3+)和淡绿色(Tb3+)长余辉发光材料。它们的持久亮度(0.32mcd m−2)的持续时间可分别持续约8h和12h。另一方面，Nd3+-Cr3+和Dy3+-Cr3+共掺YAGG样品的持久发光强度比Pr3+-Cr3+和Tb3+-Cr3+共掺样品弱得多，主要是由于Cr3+的深红色跃迁。用稀土离子在YAGG基质中的真空参考结合能(VRBE)图解释了这四种样品不同的持久发光行为的机理。详细讨论了空穴陷阱在Pr3+、Nd3+、Tb3+和Dy3+基态离子中的稳定性，以及与Cr3+电子陷阱合作诱导持久发光的可能性。
We have developed Pr3+–Cr3+ and Tb3+–Cr3+ co-doped Y3Al2Ga3O12 (YAGG) persistent phosphors with orange (Pr3+) and light green (Tb3+) persistent luminescence. The duration of their persistent luminance (of 0.32 mcd m−2) can last up to about 8 h and 12 h, respectively. On the other hand, the persistent luminescence intensities of Nd3+–Cr3+ and Dy3+–Cr3+ co-doped YAGG samples are much weaker than those of the Pr3+–Cr3+ and Tb3+–Cr3+ co-doped ones, and the dominant persistent luminescence is mainly due to the deep-red transition of Cr3+. The mechanisms of different persistent luminescence behaviors of these four samples can be explained by the vacuum referred binding energy (VRBE) diagram of lanthanide ions in the YAGG host. The stability of hole traps at the ground states of Pr3+, Nd3+, Tb3+ and Dy3+ ions and the possibility to collaborate with Cr3+ electron traps to induce persistent luminescence are discussed in detail.