Preparation, Characterization, and Photoluminescence Properties of Tb3+-, Ce3+-, and Ce3+/Tb3+-Activated RE2Si4N6C (RE = Lu, Y, and Gd) Phosphors
Preparation, Characterization, and Photoluminescence Properties of Tb3+-, Ce3+-, and Ce3+/Tb3+-Activated RE2Si4N6C (RE = Lu, Y, and Gd) Phosphors
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DOI：
10.1021/cm103495j
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发表时间：
2011-04-12
影响因子：
8.6
通讯作者：
Hintzen, H. T.
中科院分区：
文献类型：
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作者：
Duan, Chengjun;Zhang, Zhijun;Hintzen, H. T.
研究了Tb 3+、Ce 3+单掺和Ce 3 +/Tb 3+共掺RE 2 Si 4 N 6 C（RE = Lu，Y，Gd）荧光粉的发光性能。Tb~（3+）在RE_2Si_4N_6C（RE = Lu，Y，Gd）基质晶格中表现出类似的发光性质，在300 nm左右的紫外光激发下发出明亮的绿色光。Ce~（3+）在RE_2Si_4N_6C基质晶格中的发光特性受RE~（3+）离子尺寸的影响（Lu_2Si_4N_6C和Y_2Si_4N_6C对Gd_2Si_4N_6C）。Ce3+激活的Lu2Si4N6C和Y2Si4N6C磷光体在450 - 750 nm的波长范围内表现出宽带发射，峰值中心在约540 nm处，而Ce3+激活的Gd2Si4N6C在500 - 800 nm的波长范围内表现出宽带发射，峰值中心在约610 nm处。这种差异归因于Ce 3+在Gd2S4N6C中的两个晶体学位置上的不同位置占据，与Y和Lu化合物相比。In Ce 3 +/Tb 3+共掺杂RE 2 Si 4 N 6 C（RE = Lu，Y，Gd）荧光粉中，在Ce 3 +/Tb 3+共掺杂的Lu 2 Si 4 N6 C和Y 2 Si 4 N6 C中，能量转移发生在Ce 3+到Tb 3+之间，而在Ce 3 +/Tb 3+共掺杂的Gd 2 Si 4 N6 C中，能量转移发生在Tb 3+到Ce 3+之间，这取决于Ce 3+的5d能级相对于Tb 3+的5D（4）能级的位置。指出了这些荧光粉的潜在应用。
Photoluminescence properties of Tb3+ and Ce3+ singly doped and Ce3+/Tb3+-codoped RE2Si4N6C (RE = Lu, Y, and Gd) phosphors were investigated. Tb3+ shows similar luminescence properties in RE2Si4N6C (RE = Lu, Y, and Gd) host lattices and emits bright green light under UV excitation around 300 nrn. The luminescence properties of Ce3+ in RE2Si4N6C host lattices are influenced by the size of the RE3+ ions (Lu2Si4N6C and Y2Si4N6C vs Gd2Si4N6C). Both Ce3+-activated Lu2Si4N6C and Y2Si4N6C phosphors exhibit a broad band emission in the wavelength range of 450-750 nm with peak center at about 540 am, while Ce3+-activated Gd2Si4N6C shows a broad emission band in the wavelength range of 500-800 nm with peak center at about 610 nm. This difference is ascribed to the different site occupations of Ce3+ on the two crystallographic sites in Gd2S4N6C as compared to the Y and Lu compounds. In Ce3+/Tb3+-codoped RE2Si4N6C (RE = Lu,Y, and Gd) phosphors, it is observed that energy transfer takes place from Ce3+ to Tb3+ in Ce3+/Tb3+-codoped Lu2Si4N6C and Y2Si4N6C but in the reversed direction from Tb3+ to Ce3+ in Ce3+/Tb3+-codoped Gd2Si4N6C, depending on the position of the 5d level of Ce3+ versus the 5D(4) level of Tb3+. The potential applications of these phosphors are pointed out.