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excitation and emission spectra of InNbO4: pr

Last Update Time: 2018-10-11 10:28:05
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excitation and emission spectra of InNbO4: pr

The excitation spectra of InNbO4: 0. 003Pr at 614 nm. The excitation spectra of the sample mainly contain four sharp peaks, corresponding to the H _4 level transition of pr, that is, H  4. →P2 (λ 449 nm), H4. →P  2, P  2, H 4 (7 ~ (7) nm) and H 4(P). (λ = 489 nm) and H4. →D2 (λ 583 mm). Of which H4. →P2 and 4H. →D2 is a hypersensitive transition, which is very sensitive to the surrounding environment of the matrix and is related to the local symmetry of pr. When Pr* is located in the center of symmetry, there will be no sharp peak of this transition. At 449-470 nm, there are several peaks whose intensity is not very high. This is due to the addition of pr, which affects the crystal field of the matrix InNbO, which leads to the splitting phenomenon of the excited state, which leads to the sublevel of different energy. The wavelength of 449-470 nm is the wavelength of the blue LED chip.

InNb04: 0. emission spectra of 003Pr phosphors excited by 466nm blue light. There are two main emission peaks, located at 603 nm and 614 nm, corresponding to Pr2's D24H and Po, respectively. →H6 transition. These two high-intensity transitions of Pr3 are located in the region of red light, which indicates that red light can be emitted from Pr3 + doped InNbO4 matrix under blue light excitation.

Mixed with different content of pr the effect on luminescence intensity of phosphors. The change of P concentration did not result in the change of the emission peak of the sample, but only the change of the peak position of the sample.

The intensity of the emission peak changes. With the increase of pr °, the emission intensity of the sample increases at the beginning stage. When the pr + content reaches 0.3 mol%, the emission intensity of the sample reaches the maximum, and then decreases sharply, compared with other rare earth ions, such as EU, pr doped.

The impurity concentration is relatively low, which may be due to the short ion spacing of pr in the matrix, which is easy to cause concentration quenching, so the optimum Pr' doping concentration is 0.3 mol%.