Structures and luminescence properties of Eu2+- doped α-sialon phosphors for UV-LED
Structures and luminescence properties of Eu2+- doped α-sialon phosphors for UV-LED
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DOI：
10.1007/s10832-008-9446-x
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发表时间：
2009-10
影响因子：
1.7
通讯作者：
B. Jang;J. Park;Joon-soo Kim;S. Han;Hong-Soo Kim;Y. Ahn;S. Yoo
中科院分区：
文献类型：
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作者：
B. Jang;J. Park;Joon-soo Kim;S. Han;Hong-Soo Kim;Y. Ahn;S. Yoo
合成了Eu2+掺杂α-硅氧烷荧光粉，研究了其结构和各种发光性能。未掺杂和掺入Eu2+的样品分别获得了高晶相ca0.8 al2.8 si9.2o1 169n14.94。掺入Eu2+的α-硅藻荧光粉具有较宽的紫外和可见光吸收范围，在570 ~ 582 nm处有较宽的发射峰。以0.75 mol% Eu2+掺杂ca0.8 al2.8 si9.2o1 169n14.94为原料，在30% H2-70% N2atm中，1650℃煅烧2h，得到了最佳的合成和工艺条件。利用该荧光粉制备了紫外发光二极管（LED）灯，并对其光学性能进行了测试。荧光粉的相对量子效率为83.66%，灯的发光效率为35.28 lm/W。这些结果表明，本研究中Eu2+掺杂α-硅氧烷荧光粉是UV-LED光源的良好候选材料。
Eu2+-doped α-sialon phosphor was synthesized and structures and various luminescence properties were studied. High crystalline Ca0.8Al2.8Si9.2O1.169N14.94phase was successively obtained for undoped and Eu2+-doped samples. Eu2+-doped α-sialon phosphor exhibited wide absorption in ultra violet (UV) and visible range, and high broad emission band peaking at from 570 to 582 nm. The optimum compositions and process conditions was obtained from 0.75 mol% Eu2+–doped Ca0.8Al2.8Si9.2O1.169N14.94fired at 1650 °C for 2 h in 30% H2–70% N2atm. In addition, fabrication of UV-light emitting diode (LED) lamp using this phosphor was conducted and the optical properties were measured. Relative quantum efficiency of the phosphor and luminous efficiency of the lamp were 83.66% and 35.28 lm/W, respectively. Those results indicated that Eu2+-doped α-sialon phosphor in this study was a good candidate for UV-LED light source.