Tunable photoluminescence and energy transfer of YBO3:Tb3+, Eu3+ for white light emitting diodes
Tunable photoluminescence and energy transfer of YBO3:Tb3+, Eu3+ for white light emitting diodes
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DOI：
10.1039/c3tc31200c
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发表时间：
2013-10
影响因子：
6.4
通讯作者：
Xianwen Zhang;Zhi Zhao;Xin Zhang;A. Marathe;D. Cordes;B. Weeks;J. Chaudhuri
中科院分区：
文献类型：
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作者：
Xianwen Zhang;Zhi Zhao;Xin Zhang;A. Marathe;D. Cordes;B. Weeks;J. Chaudhuri
采用简便的水热法制备了稀土(Eu 3+ 、Tb 3+ )离子共掺杂YBO 3 荧光粉，其具有均匀的花状组装形态，无需使用表面活性剂、有机配体或进一步的烧结处理。光致发光（PL）研究表明，在365 nm紫外（UV）光的激发下，YBO 3:Tb 3+, Eu 3+ 发出白光，包括三种发射：归因于自陷激子（STE）的蓝带、归因于5D 4– 7F j（j = 6、5、4和3）的Tb 3+ 跃迁的绿带和归因于Eu的红带。 5D 0– 7F j 的 3+ 跃迁（j = 0、1、2、3 和 4）。证明了从主体YBO 3 到Tb 3+ 以及Eu 3+ 和Tb 3+ 到Eu 3+ 的能量转移，以及通过改变相对掺杂比的可调发射。 STE 发出的蓝光与活化剂发出的绿光和红光相结合，提供了一种新颖且高效的技术来制造白光发光二极管 (WLED)。
Rare-earth (Eu 3+, Tb 3+) ion co-doped YBO 3 phosphors with a morphology of uniform flower-like assembly are fabricated by a facile hydrothermal method without the use of surfactant, organic ligands, or further sintering treatment. Photoluminescence (PL) studies have demonstrated that under the excitation of 365 nm ultraviolet (UV) light, YBO 3:Tb 3+, Eu 3+ emits a white light, including three emissions: a blue band attributed to self-trapped excitons (STEs), a green band due to the Tb 3+ transition of 5D 4– 7F j ( j = 6, 5, 4, and 3), and a red band due to the Eu 3+ transition of 5D 0– 7F j ( j = 0, 1, 2, 3, and 4). Energy transfers from host YBO 3 to Tb 3+, and Eu 3+ and Tb 3+ to Eu 3+, as well as tunable emission by varying the relative doping ratios are demonstrated. The combination of blue emission from STEs with green and red emissions from activators provides a novel and efficient technique to make white light emitting diodes (WLEDs).