Tunable long lasting phosphorescence due to the selective energy transfer from defects to luminescent centres via tunnelling in Mn(2+) and Tm(3+) co-doped zinc pyrophosphate.
Tunable long lasting phosphorescence due to the selective energy transfer from defects to luminescent centres via tunnelling in Mn(2+) and Tm(3+) co-doped zinc pyrophosphate.
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DOI：
10.1039/c4dt00223g
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发表时间：
2014-06
影响因子：
4
通讯作者：
R. Pang;Yonglei Jia;Ran Zhao;Haifeng Li;Jipeng Fu;Wenzhi Sun;Lihong Jiang;Su Zhang;Chengyu Li-Chen
中科院分区：
文献类型：
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作者：
R. Pang;Yonglei Jia;Ran Zhao;Haifeng Li;Jipeng Fu;Wenzhi Sun;Lihong Jiang;Su Zhang;Chengyu Li-Chen
合成了一系列新的荧光粉Zn_2（0.97-x）P_2 O_7：0.06Tm（3+），2xMn（2+）（0 ≤ x ≤ 0.05），并研究了它们的发光性能。结果表明，所有荧光粉中的缺陷都与Tm（3+）有关，Mn（2+）仅作为发光中心。在低Mn（2+）浓度（x ≤ 0.001）的荧光粉中，Tm（3+）也作为发射中心，产生与其特征f-f发射相对应的蓝色磷光，而在高Mn（2+）浓度的荧光粉中，Tm（3+）主要作为缺陷形成Tm。缺陷热释放的电子主要通过热辅助隧道效应选择性地转移到Mn（2+）中心，从而产生红光至近红外磷光。通过调节Mn（2+）和Tm（3+）的比例来控制光谱分布，实现了从蓝光到近红外的可调谐长余辉发光。
A series of new phosphors Zn2(0.97-x)P2O7:0.06Tm(3+),2xMn(2+) (0 ≤ x ≤ 0.05) were synthesized and their luminescence properties were investigated. The results showed that the defects in all the phosphors were related to Tm(3+), and Mn(2+) merely served as the emission centres. Tm(3+) also acted as an emission centre and yielded blue phosphorescence corresponding to its characteristic f-f emissions in the phosphors where the Mn(2+) concentration was low (x ≤ 0.001), while in the phosphors with high concentrations of Mn(2+) it mainly served as a defect by forming Tm. The electrons thermally released from defects selectively transferred to Mn(2+) centres mainly through thermally-assisted tunnelling and this resulted in their red to near-infrared phosphorescence. By adjusting the ratio of Mn(2+) to Tm(3+) to control the spectral distribution, tunable long lasting phosphorescence from blue to near-infrared was achieved.