Novel Red-Emitting Ba2Tb(BO3)2Cl:Eu Phosphor with Efficient Energy Transfer for Potential Application in White Light-Emitting Diodes
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- 作者：Zhiguo Xia ; Jiaqing Zhuang ; Libing Liao
- 刊名：Inorganic Chemistry
- 出版年：2012
- 出版时间：July 2, 2012
- 年：2012
- 卷：51
- 期：13
- 页码：7202-7209
- 全文大小：502K
- 年卷期：v.51,no.13(July 2, 2012)
- ISSN：1520-510X
文摘
A novel red-emitting Ba2Tb(BO3)2Cl:Eu phosphor possessing a broad excitation band in the near-ultraviolet (n-UV) region was synthesized by the solid-state reaction. Versatile Ba2Tb(BO3)2Cl compound has a rigid open framework, which can offer two types of sites for various valence鈥檚 cations to occupy, and the coexistence of Eu2+/Eu3+ and the red-emitting luminescence from Eu3+ with the aid of efficient energy transfer of Eu2+鈥揈u3+(Tb3+) and Tb3+鈥揈u3+ have been investigated. Ba2Tb(BO3)2Cl emits green emission with the main peak around 543 nm, which originates from 5D4 鈫?7F5 transition of Tb3+. Ba2Tb(BO3)2Cl:Eu shows bright red emission from Eu3+ with peaks around 594, 612, and 624 nm under n-UV excitation (350鈥?20 nm). The existence of Eu2+ can be testified by the broad-band excitation spectrum, UV鈥搗is reflectance spectrum, X-ray photoelectron spectrum, and Eu L3-edge X-ray absorption spectrum. Decay time and time-resolved luminescence measurements indicated that the interesting luminescence behavior should be ascribed to efficient energy transfer of Eu2+鈥揈u3+(Tb3+) and Tb3+鈥揈u3+ in Ba2Tb(BO3)2Cl:Eu phosphors.