Lanthanide-Doped Fluoride Core/Multishell Nanoparticles for Broadband Upconversion of Infrared Light

作者：Shao, Wei; Chen, Guanying^*; Ohulchanskyy, Tymish Y.; Kuzmin, Andrey; Damasco, Jossana; Qiu, Hailong; Yang, Chunhui; Agren, Hans; Prasad, Paras N.

来源：Advanced Optical Materials, 2015, 3(4): 575-582.

DOI：10.1002/adom.201400404

• upconversion
• core
• shell
• cross-relaxation
• lanthanide elements
• nanoparticles
• solar materials

The authors introduce a novel multilayer core/shell design to broadly upconvert infrared (IR) light at many discrete wavelengths into visible or near-IR (NIR) emissions. It utilizes hexagonal-phase core/multishell NaYF4:10%Er3+@NaYF4@NaYF4:10%Ho3+@NaYF4@NaYF4:1%Tm3+@NaYF4 nanoparticles, where the active core as well as each active shell upconvert a distinct set of IR wavelength. The inert NaYF4 layers in between these upconverting domains efficiently suppress the detrimental cross-relaxation processes between different types of lanthanide ions, thus yielding about two times more efficient upconversion photoluminescence than the counterpart NaYF4:10%Er3+@NaYF4:10%Ho3+ @NaYF4:1%Tm3+@NaYF4 without the inert NaYF4 layers, and about one order of magnitude higher than the core/shell NaYF4:10%Er3+, 10%Ho3+, 1%Tm3+@NaYF4 nanoparticles without spatially isolating the Er3+, Ho3+, and Tm3+ ions. These core/multishell nanoparticles can be excited at approximate to 1120-1190 nm (due to Ho3+), approximate to 1190-1260 nm (due to Tm3+), and approximate to 1450-1580 nm (due to Er3+), collectively covering a broad spectral range of about 270 nm in the IR range that can be very useful for IR photosensitization of solar cells.

• 出版日期2015-4
• 单位哈尔滨工业大学