Dynamically Tuning the Up-conversion Luminescence of Er3+/Yb3+ Co-doped Sodium Niobate Nano-crystals through Magnetic Field

Abstract

In this work, we show here that the up-conversion luminescence of NaNbO3:Er3+/Yb3+ nano-materials can be modulated by magnetic field and a enhancement of up-conversion intensities by a factor of about 2 for Er3+:4S3/2 → 4I15/2 obtained at 30 T and about 5.4 for Er3+:4F9/2 → 4I15/2 obtained at 20 T. The increased up-conversion luminescence are mainly interpreted in terms of the enhanced non-radiation transition from 4I11/2 to 4I13/2 of Er3+ ions and the spin-orbital coupling (that is “mixing” effect) in crystal field by an external magnetic field. Meanwhile, we observed continuously spectra broadening with growing the magnetic field intensity, which is ascribed to the “mixing” effect induced by magnetic field and the difference of g factor of sub-bands. This bi-functional material with controllable optical-magnetic interactions has various potential applications, such as optical detection of magnetic field, etc.

Effect of Bi3+ ion on upconversion-based induced optical heating and temperature sensing characteristics in the Er3+/Yb3+ co-doped La2O3 nano-phosphor

“…9(a) shows large number of peaks at 381, 490, 523, 548 and 671 nm and they are attributed to 2 I 15/2 / 4 G 11/2 , 4 F 5/2 , 2 H 11/2 , 4 S 3/2 and 4 F 9/2 transitions of Er 3+ ion, respectively. [12][13][14][15][16][17][18] The gure also shows a broad band centered at 976 nm due to 2 F 7/2 / 2 F 5/2 transition of Yb 3+ ion. 15 When the Bi 3+ ion is added in the phosphor the spectrum contains additional bands in the 220-340 nm region due to Bi 3+ ion (see Fig.…”

“…The phosphor sample gives a weak blue (at 492 nm), strong green (at 523 and 548 nm) and red (at 660 and 671 nm) upconversion emissions due to 4 F 5/2 / 4 I 15/2 , 2 H 11/2 / 4 I 15/2 , 4 S 3/2 / 4 I 15/2 , and 4 F 9/2 / 4 I 15/2 transitions of Er 3+ ion, respectively. [12][13][14][15][16][17][18] The blue emission arises due to absorption of three 976 nm photons whereas the green and red emissions have been observed due to absorption of two 976 nm photons, respectively. 15 The emission intensity of the phosphors has been measured for different concentrations of Bi 3+ ions while the concentrations of Er 3+ and Yb 3+ ions are xed at 0.7 and 3.0 mol%, respectively.…”

“…Finally, the 4 F 5/2, 2 H 11/2 , 4 S 3/2 and 4 F 9/2 states are populated, which give radiative transitions at 493, 523, 548 and 671 nm wavelengths, respectively. [12][13][14][15][16][17][18]20 3.2.4 Induced optical heating measurements. The induced optical heating in the Er 3+ /Yb 3+ co-doped phosphors have been widely studied by different groups of researchers in different host materials.…”

“…The optical properties of the Er 3+ /Yb 3+ co-doped phosphor materials have been studied in detail by different groups. [12][13][14][15][16][17][18][19][20] They have reported intense green and weak red upconverted emissions upon 976 nm excitation in which the green emission arises due to the transition from the thermally coupled energy levels (viz. 2 H 11/2 and 4 S 3/2 ) to the ground level ( 4 I 15/2 ) of Er 3+ ion.…”

Near Infrared Quantum Cutting Luminescence of Er3+/Tm3+ Ion Pairs in a Telluride Glass

“…Meijerink and Vergeer first demonstrated an experiment on the near-infrared, two-photon quantum cutting phenomenon in Yb x Y 1−x PO 4 :Tb 3+ phosphors in 2005 1 , which was conducted after they reported a well-known visible quantum cutting experiment for an Eu 3+ /Gd 3+ system in Science 2 . Since 2007, several groups, including Meijerink 1, 3, 19, 21, 27 , Qiu and Zhou 5, 12, 15 , Wang and Chen 6, 11, 13 , Huang 24 , Zou and Wang 25 , Fedorov and Luginina 9 , Zhang 7, 27 , Xia and Hu 29 , Guo and Chen 23 , and Song and Tao 30, 32 , and more 17, 20, 22 , have published more than 200 articles on the second-order, near-infrared, quantum cutting luminescence phenomena of sensitizer-Yb 3+ co-doped materials 1–25 , which were used to develop two-photon quantum cutting silicon solar cells. Near-infrared quantum cutting has become a hot topic in the field of science and nature.…”