Upconversion emission and the emission color modulation of the NaMgF3:Er3+, Yb3+, Mn2+ submicron particles

Li, Xin; He, Yu; Guo, Yangyang; Mao, Huibing; Chen, Ye; Wang, Jiqing

doi:10.1007/s11082-023-05209-6

Cited by 2 publications

(1 citation statement)

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“…The upconversion (UC) emission of the nanoparticles doped with the trivalent lanthanide (Ln 3þ ) ions has been an interesting field in the last decades due to their ability to decrease the wavelength of the incident light, which can convert the near-infrared radiation (NIR) into the visible light by a two-photon or multi-photon process. [1][2][3][4][5] In the UC process, one of the most important parameters is the absorption cross section of the activator ions. As the lanthanide ions exhibit low absorption, the UC emission with only one activator ion shows relative low efficiency.…”

Section: Introductionmentioning

confidence: 99%

Upconversion emission and its color modulation of the YVO4: Er3+, Yb3+, Cr3+ nanoparticles

He,

Li,

Guo

et al. 2024

Opt. Eng.

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With the excitation of a 978 nm laser, the upconversion (UC) emissions of the YVO 4 : Er 3þ , Yb 3þ , Cr 3þ nanoparticles include three emission bands located at 524, 552 and 658 nm, respectively. The UC emission characterization confirms that the UC emission of the YVO 4 : Er 3þ , Yb 3þ nanoparticles can be modulated by the doping of the Cr 3þ ions, the increase of the incident laser power and the change of the laser pulse-width. With the doping of the Cr 3þ ions, the two green emissions decrease because of the energy transfer from the Er 3þ states 2 H 11∕2 and 4 S 3∕2 to the Cr 3þ ions. With the increase of the incident laser power, the two green emissions increase due to the decrease of the transfer rate of the energy transfer path to the state 4 F 9∕2 of the Er 3þ ions. With the increase of the incident laser pulse-width from 0.2 to 6 ms the intensity ratio of the emission at 524 nm to the emission at 658 nm increases from 0.063 to 0.19, which is due to the number accumulation at the state 2 H 11∕2 due to the small transfer rate from the Er 3þ state 2 H 11∕2 to the Cr 3þ ions. The experimental results confirm that the concentration of the Cr 3þ ions has less effect on the average life-time of the UC emissions at 524, 552, and 658 nm.

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