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Title: Lanthanide Yb/Er co-doped semiconductor layered WSe2 nanosheets with near-infrared luminescence at telecommunication wavelengths
Authors: Bai, GX 
Yang, ZB 
Lin, HH 
Jie, WJ 
Hao, JH 
Issue Date: 2018
Publisher: Royal Society of Chemistry
Source: Nanoscale, 21 May 2018, v. 10, no. 19, p. 9261-9267 How to cite?
Journal: Nanoscale 
Abstract: Atomically thin layers of transition metal dichalcogenides (TMDs) have recently drawn great attention. However, doping strategies and controlled synthesis for wafer-scale TMDs are still in their early stages, greatly hindering the construction of devices and further basic studies. In this work, we develop the fast deposition of wafer-scale layered lanthanide ion Yb/Er co-doped WSe2 using pulsed laser deposition. WSe2 nanosheets were chosen as the host, while Yb3+ and E3+ ions served as the sensitizer and activator, respectively. The obtained Yb/Er co-doped WSe2 layers exhibit good uniformity and high crystallinity with highly textured features. Under the excitation of a diode laser at 980 nm, down-conversion emission is observed at around 1540 nm, assigned to the emission transition between the (4) I-13/2 and I-4(15/2) states of Er3+. Considering the significance of 1540 nm luminescence in the application of photonic technologies, this observation in the WSe2 :Yb/Er nanosheets down to the monolayer provides a new opportunity for developing photonic devices at the 2D limit. Our work not only offers a general method to prepare waferscale lanthanide doped TMD5, but also to widely modulate the luminescence of atomically layered TMD5 by introducing lanthanide ions.
ISSN: 2040-3364
EISSN: 2040-3372
DOI: 10.1039/c8nr01139g
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