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Open AccessArticle

Simultaneous Dual-mode Emission and Tunable Multicolor in the Time Domain from Lanthanide-doped Core-shell Microcrystals

1
School of Physics & The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai University, Tianjin 300071, China
2
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
3
The Institute of Spectroscopy of the Russian Academy of Sciences, 142190 Moscow, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 1023; https://doi.org/10.3390/nano8121023
Received: 21 November 2018 / Revised: 3 December 2018 / Accepted: 6 December 2018 / Published: 7 December 2018
The dual-mode emission and multicolor outputs in the time domain from core-shell microcrystals are presented. The core-shell microcrystals, with NaYF4:Yb/Er as the core and NaYF4:Ce/Tb/Eu as the shell, were successfully fabricated by employing the hydrothermal method, which confines the activator ions into a separate region and minimizes the effect of surface quenching. The material is capable of both upconversion and downshifting emission, and their multicolor outputs in response to 980 nm near-infrared (NIR) excitation laser and 252 nm, and 395 nm ultraviolet (UV) excitation light have been investigated. Furthermore, the tunable color emissions by controlling the Tb3+- Eu3+ ratio in shells and the energy transfer of Ce3+→Tb3+→ Eu3+ were discussed in details. In addition, color tuning of core-shell-structured microrods from green to red region in the time domain could be obtained by setting suitable delay time. Due to downshifting multicolor outputs (time-resolved and pump-wavelength-induced downshifting) coupled with the upconversion mode, the core-shell microrods can be potentially applied to displays and high-level security. View Full-Text
Keywords: NaYF4:Yb/[email protected]:Ce/Tb/Eu microrods; dual-mode emission; time-resolved emission spectra; multicolor emission NaYF4:Yb/[email protected]:Ce/Tb/Eu microrods; dual-mode emission; time-resolved emission spectra; multicolor emission
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MDPI and ACS Style

Ju, D.; Song, F.; Khan, A.; Song, F.; Zhou, A.; Gao, X.; Hu, H.; Sang, X.; Zadkov, V. Simultaneous Dual-mode Emission and Tunable Multicolor in the Time Domain from Lanthanide-doped Core-shell Microcrystals. Nanomaterials 2018, 8, 1023.

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