Separating and enhancing the green and red emissions of NaYF4:Yb3+/Er3+ by sandwiching them into photonic crystals with different bandgaps†,Nanoscale Horizons

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Separating and enhancing the green and red emissions of NaYF4:Yb3+/Er3+ by sandwiching them into photonic crystals with different bandgaps†
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1039/c8nh00136g
Baoqi Liu _{1,

2,

3,

4} , Zhipeng Meng _{1,

2,

3,

4} , Suli Wu _{1,

2,

3,

4} , Yue Wu _{1,

2,

3,

4} , Shufen Zhang _{1,

2,

3,

4}

Affiliation

Rational control of the multiple emission outputs and achieving single-band and strong luminescence of Ln³⁺ doped upconversion nanoparticles is highly desirable for their applications in sensor and display fields. Here, we designed a sandwich structure to separate and enhance the green and red emission of NaYF₄:Yb³⁺/Er³⁺ simultaneously and realized pure strong green and red emissions. NaYF₄:Yb³⁺/Er³⁺ nanocrystals were sandwiched between two layers of photonic crystals, which have bandgaps at 660 nm and 530 nm, respectively. The photonic crystal with a bandgap at 530 nm on top of the NaYF₄:Yb³⁺/Er³⁺ layer can filter the green emission of NaYF₄:Yb³⁺/Er³⁺, prohibiting its emission upward, and at the same time, enhancing its emission downward. Similarly, the photonic crystal with a bandgap at 660 nm can prohibit the transmission of the red emission, and at the same time enhance its reflection in the opposite direction. Consequently, enhanced green emission was observed from the bottom of the sandwich structure and enhanced red emission was observed from the top of the sandwich structure. Thus, the green and red emissions of NaYF₄:Yb³⁺/Er³⁺ were separated and both of them were enhanced. On the other hand, when using a photonic crystal with a bandgap that overlapped with the excitation light of NaYF₄:Yb³⁺/Er³⁺ nanoparticles, their emissions were all greatly enhanced. Our results suggest that photonic crystals are good candidates to separate and enhance the emissions of Ln³⁺ doped luminescent materials.

中文翻译：

通过将NaYF ₄：Yb ³⁺ / Er ³⁺夹在具有不同带隙的光子晶体中来分离和增强NaYF ₄：Yb ³⁺ / Er ³⁺的绿色和红色发射†

对于其在传感器和显示领域中的应用，非常需要合理地控制多个发射输出并实现Ln ³⁺掺杂的上转换纳米粒子的单波段和强发光。在这里，我们设计了一种三明治结构，以同时分离和增强NaYF ₄：Yb ³⁺ / Er ³⁺的绿色和红色发射，并实现了纯正的绿色和红色发射。NaYF ₄：Yb ³⁺ / Er ³⁺纳米晶体夹在两层光子晶体之间，这两层光子分别在660 nm和530 nm处具有带隙。NaYF ₄：Yb ³⁺ / Er上方具有530 nm带隙的光子晶体³⁺层可以过滤NaYF₄：Yb³⁺ / Er³⁺的绿色发射，阻止其向上发射，同时，向下增强发射。类似地，在660 nm处具有带隙的光子晶体可以阻止红色发射的传输，同时增强其在相反方向上的反射。因此，从夹心结构的底部观察到增强的绿色发射，并且从夹心结构的顶部观察到增强的红色发射。因此，NaYF₄的绿色和红色发射：Yb³⁺ / Er³⁺被分离，并且两者都得到了增强。另一方面，当使用带隙与NaYF ₄：Yb ³⁺ / Er ³⁺纳米粒子的激发光重叠的光子晶体时，它们的发射都大大提高了。我们的结果表明，光子晶体是分离和增强Ln ³⁺掺杂的发光材料发射的良好候选者。

更新日期：2018-07-03

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