Efficient green phosphor realized by Ce3+→Tb3+ energy transfer in Li3Sc2(PO4)3 for ultraviolet white light-emitting diodes†,Physical Chemistry Chemical Physics

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Efficient green phosphor realized by Ce3+→Tb3+ energy transfer in Li3Sc2(PO4)3 for ultraviolet white light-emitting diodes†
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-10-06 00:00:00 , DOI: 10.1039/c8cp05942j
Mengmeng Jiao _{1,

2,

3} , Qinfeng Xu _{1,

2,

3} , Mingliang Liu _{1,

2,

3} , Chuanlu Yang _{1,

2,

3} , Yongjiang Yu _{1,

2,

3}

Affiliation

A series of Ce³⁺/Tb³⁺ doped Li₃Sc₂(PO₄)₃ phosphors has been obtained using high temperature solid state reactions. Density functional theory (DFT) calculations using the CASTEP module have given an insight into the bandgap and electronic structures of the hosts. The phase formation and the crystal structure of the prepared samples were verified using X-ray diffraction and Rietveld structure refinement analysis. Samples singly doped with Ce³⁺ ions had an intense emission centered at 350 nm under UV light irradiation, while samples singly doped with Tb³⁺ ions exhibited a typical green emission under 230 nm irradiation. Efficient Ce³⁺→Tb³⁺ energy transfer can cause the Li₃Sc₂(PO₄)₃:Ce³⁺,Tb³⁺ samples to have an intense green emission at very low Tb³⁺ concentrations under 285 nm excitation, making Li₃Sc₂(PO₄)₃:Ce³⁺,Tb³⁺ an efficient UV-excited green phosphor. The mechanism and critical distance for Ce³⁺→Tb³⁺ energy transfer in the phosphor were determined by detailed luminescence decay curve analysis utilizing the I–H model. Moreover, a WLED device was fabricated using our prepared green phosphor.

中文翻译：

通过Li ₃ Sc ₂（PO ₄）_3中的Ce ³⁺ →Tb ³⁺能量转移实现的高效绿色磷光体，用于紫外白色发光二极管†

使用高温固态反应已经获得了一系列掺杂Ce ³⁺ / Tb ^3+的Li ₃ Sc ₂（PO ₄）₃荧光粉。使用CASTEP模块的密度泛函理论（DFT）计算已经深入了解了主机的带隙和电子结构。使用X射线衍射和Rietveld结构细化分析验证了所制备样品的相形成和晶体结构。单独掺有Ce ³⁺离子的样品在紫外光照射下具有集中在350 nm处的强烈发射，而单独掺有Tb ³⁺离子的样品在230 nm照射下表现出典型的绿色发射。高效铈³⁺ →Tb^3+的能量转移会导致Li₃ Sc₂（PO₄）₃：Ce³⁺，Tb³⁺样品在285 nm激发下在非常低的Tb³⁺浓度下具有强烈的绿色发射，从而形成Li₃ Sc₂（PO₄）₃：Ce³⁺，Tb³⁺是一种有效的紫外线激发绿色荧光粉。Ce³⁺ →Tb³⁺的机理和临界距离通过使用I–H模型的详细发光衰减曲线分析来确定磷光体中的能量转移。此外，使用我们准备的绿色荧光粉制造了WLED器件。

更新日期：2018-10-06

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