NIR upconversion luminescence of NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures

被引：0

作者：

He, Guang-Hui ^{[1
]}

Bi, Xue-Qing ^{[1
]}

Song, Wei-Ye ^{[1
]}

Di, Wei-Hua ^{[1
]}

Qin, Wei-Ping ^{[1
]}

机构：

[1] State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun

来源：

Faguang Xuebao/Chinese Journal of Luminescence | 2015年 / 36卷 / 05期

关键词：

CdSe; Energy transfer; Nanoheterostructures; NaYF[!sub]4[!/sub]:Yb[!sup]3+[!/sup; Tm[!sup]3+[!/sup; Upconversion luminescence;

D O I：

10.3788/fgxb20153605.0491

中图分类号：

学科分类号：

摘要：

NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures with NIR-to-NIR upconversion luminescence were synthesized by a two-step improved wet-chemical method. X-ray diffraction (XRD) characterization shows that the nanoheterostructures are composed of both pure hexagonal phase NaYF4:Yb3+, Tm3+ and wurtzite phase CdSe. Upconversion emission spectra under the excitation of 980 nm near-infrared laser show that 797 nm emission from Tm3+ ions has been enhanced greatly, while neither ultraviolet nor blue emissions of Tm3+ appear compared with that of pure NaYF4:Yb3+, Tm3+. It indicates that the energy transfer occurs between NaYF4:Yb3+, Tm3+ and CdSe. Under 980 nm excitation, the energy absorbed by Yb3+ ions transfers to Tm3+ ions, then transfers to CdSe partially, and finally the excited CdSe returns the energy back to the corresponding energy levels of Tm3+. These processes lead to the quenching of UV and blue emissions and the enhancement of 797 nm emission of Tm3+ ions in the NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures. The excitation (980 nm) and emission (797 nm) are both located in the NIR spectral range (700-1100 nm) that is referred as the “optical window” of biological tissues because of the minimum of light scattering and autofluorescence of tissue and a relatively large penetration depth. Therefore, the present NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures could have potential applications in biology and biomedicine fields. ©, 2015, Chines Academy of Sciences. All right reserved.

引用

页码：491 / 496

页数：5

共 15 条

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