Sm3+ and Eu3+ codoped SrBi2B2O7: a red-emitting phosphor with improved thermal stability
Sm3+ and Eu3+ codoped SrBi2B2O7: a red-emitting phosphor with improved thermal stability
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Sm3 和 Eu3 共掺杂 SrBi2B2O7：一种具有改进热稳定性的红光荧光粉
DOI：
10.1039/c6ra26752a
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Xu, Jingjun
中科院分区：
文献类型：
--
作者：
Wu, Liwei;Bai, Yuxing;Xu, Jingjun
发光的热稳定性对白色发光二极管是非常关键的。然而，提高红色荧光粉的热稳定性是一个持续的挑战。采用高温固相反应法合成了Sm 3+和Eu 3+共掺杂的SrBi 2B 2 O 7。结果表明，在SrBi 2B 2 O 7中掺入Sm 3+作为Eu 3+的敏化剂，可以提高合成荧光粉的热稳定性。结合局域晶体环境研究和第一性原理计算，详细分析了这种热稳定性提高的原因。Sm ~（3+）和Eu ~（3+）离子同时占据Bi（1）（6c）和Bi（2）（6c）晶位，高温下SrBi_2B_2 O_7：Sm ~（3+），Eu ~（3+）的晶体结构比室温下更致密。因此，Sm 3+和Eu 3+共掺杂的SrBi 2B 2 O 7发光材料的缺陷形成能很低，这是Sm 3+和Eu 3+共掺杂提高SrBi 2B 2 O 7发光材料热稳定性的主要原因。该研究为开发提高红色荧光粉热稳定性的新方法提供了新思路。
The thermal stability of luminescence is very critical for white light-emitting diodes. However, it is a continuous challenge to improve the thermal stability of red phosphors. In this study, Sm3+ and Eu3+ codoped SrBi2B2O7 was synthesized by a high temperature solid state reaction method. It was found that the thermal stability of the synthesized phosphors was improved as Sm3+ was used as the sensitizer for Eu3+ doped into SrBi2B2O7. Combined with a local crystal environment study and the first-principles calculations, the origin of the improvement of this thermal stability was studied in detail. The doped Sm3+ and Eu3+ ions were inclined to occupy Bi(1) (6c) and Bi(2) (6c) sites simultaneously and the crystal structure of the SrBi2B2O7:Sm3+, Eu3+ was more compact at high temperature than that at room temperature. Thus, the defect formation energy was very low in the Sm3+ and Eu3+ codoped SrBi2B2O7 phosphor, which is the main reason to improve the thermal stability with Sm3+ and Eu3+ codoped into SrBi2B2O7. This study provides a new idea for developing a new method to improve the thermal stability of red-emitting phosphors.