张淑芬

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:化工学院

学科:应用化学. 精细化工. 有机化学

办公地点:大连市高新区凌工路2号西部校区化工楼E434房间

联系方式:0411-84986265

电子邮箱:zhangshf@dlut.edu.cn

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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

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论文类型:期刊论文

发表时间:2018-11-01

发表刊物:NANOSCALE HORIZONS

收录刊物:SCIE、Scopus

卷号:3

期号:6

页面范围:616-623

ISSN号:2055-6756

关键字:Energy gap; Luminescence; Nanoparticles; Sandwich structures; Separation, Excitation light; Green emissions; Luminescent material; Red emissions; Single band; Strong luminescence; Upconversion nanoparticles, Photonic crystals

摘要:Rational control of the multiple emission outputs and achieving single-band and strong luminescence of Ln(3+) 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 Ln(3+) doped luminescent materials.