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首页> 外文期刊>RSC Advances >Synthesis and photoluminescence of green-emitting Ce3+,Tb3+ co-doped Al6Si2O13 phosphors with high thermal stability for white LEDs
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Synthesis and photoluminescence of green-emitting Ce3+,Tb3+ co-doped Al6Si2O13 phosphors with high thermal stability for white LEDs

机译：用于白光LED的具有高热稳定性的绿色发射Ce3 +，Tb3 +共掺杂Al6Si2O13荧光粉的合成和光致发光

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In this article, novel green-emitting Ce3+, Tb3+ co-doped Al6Si2O13 phosphors have been successfully prepared by a high-temperature solid-state reaction method using Al2O3, SiO2, CeO2, and Tb4O7 powders as initial materials. Single-phased and good-crystallized phosphors have been obtained after calcining the mixed powders at 1470 degrees C under a weak reducing atmosphere. The average particle size of the as-synthesized phosphors is less than 20 mm. The optimized doping concentration of Tb3+ ion is determined to be 8 mol%. With Ce3+ co-doping as a sensitizer, the luminescence intensity of the Al6Si2O13:Ce3+/Tb3+ phosphors drastically improves as the Ce3+ doping concentration increases to 1.3 mol%. The Ce3+, Tb3+ co-doped Al6Si2O13 phosphors exhibit intense green emissions at 488, 541, 584, and 620 nm, which correspond to the characteristic level transition of D-5(4)-F-7(6), D-5(4)-F-7(5), D-5(4)-F-7(4), and D-5(4)-F-7(3) of Tb3+ ion, respectively. And Al6Si2O13:8%Tb3+, 1.3% Ce3+ possesses a decay time of 31.4 ns, as well as a quantum yield of similar to 45.7%. In addition, the solid-state synthesized Al6Si2O13:Ce3+/Tb3+ phosphor powders have comparable green luminescence properties and better thermal stability compared with available commercial green phosphors. In this regard, our target products, Al6Si2O13:Ce3+/Tb3+, may potentially serve as green-emitting phosphors for UV-converted white LEDs.
机译：在本文中，已经成功地使用Al2O3，SiO2，CeO2和Tb4O7粉末作为初始材料，通过高温固态反应方法成功地制备了新型的绿色发射Ce3 +，Tb3 +共掺杂Al6Si2O13荧光粉。在将混合粉末在弱还原气氛下于1470摄氏度下煅烧后，获得了单相和结晶良好的荧光粉。合成后的磷光体的平均粒径小于20mm。确定Tb3 +离子的最佳掺杂浓度为8mol％。使用Ce3 +共掺杂作为敏化剂，随着Ce3 +掺杂浓度增加到1.3 mol％，Al6Si2O13：Ce3 + / Tb3 +磷光体的发光强度显着提高。 Ce3 +，Tb3 +共掺杂的Al6Si2O13荧光粉在488、541、584和620 nm处显示出强烈的绿色发射，这对应于D-5（4）-F-7（6），D-5（ Tb3 +离子的4）-F-7（5），D-5（4）-F-7（4）和D-5（4）-F-7（3）。 Al6Si2O13：8％Tb3 +，1.3％Ce3 +具有31.4 ns的衰减时间，并且量子产率接近45.7％。此外，与市售绿色荧光粉相比，固态合成的Al6Si2O13：Ce3 + / Tb3 +荧光粉具有相当的绿色发光性能和更好的热稳定性。在这方面，我们的目标产品Al6Si2O13：Ce3 + / Tb3 +可能会用作紫外线转换白光LED的绿色荧光粉。

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