Increased Eu2+ Content and Codoping Mn2+ Induced Tunable Full-Color Emitting Phosphor Ba1.55Ca0.45SiO4:Eu2+,Mn2+

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• 作者：Shihai Miao ; Zhiguo Xia ; Jie Zhang ; Quanlin Liu
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：October 6, 2014
• 年：2014
• 卷：53
• 期：19
• 页码：10386-10393
• 全文大小：616K
• ISSN：1520-510X

文摘

We demonstrated that a new intermediate composition of Ba_1.55Ca_0.45SiO₄ between the orthosilicates Ca₂SiO₄ and Ba₂SiO₄ yields the best phosphor hosts, and interesting luminescence properties can be found from the Eu²⁺ singly doped and/or Eu²⁺/Mn²⁺ codoped Ba_1.55Ca_0.45SiO₄ phosphors. The phosphors can be excited by near-ultraviolet (nUV) light at wavelengths ranging from 200 to 450 nm matching well with the nUV light-emitting diode (LED) chips. As a result of fine-tuning the activators of different Eu²⁺ content and Eu²⁺/Mn²⁺ couples with different ratios, tunable full-color emission under UV light excitation can be realized by combining the blue emission (460 nm) and green emission (520 nm) originating from Eu²⁺ with the red emission (595 nm) from Mn²⁺ in the Ba_1.55Ca_0.45SiO₄ host lattice. Energy-transfer efficiency between Eu²⁺ and Mn²⁺ increases and tunable emission can be obtained with increasing Mn²⁺ doping content. These results indicate that the Ba_1.55Ca_0.45SiO₄:Eu²⁺,Mn²⁺ phosphor will have potential use in nUV chip pumped white LED devices.