Dynamics processes between Sm2+, Sm3+ and color centers in KY3F10 : Sm crystals
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Three distinct Sm2+ impurity centers, a single Sm3+ impurity center, and a color center were identified in KY3F10 with 1 mol.% of Sm ion dopant by their emission and excitation spectra in the vacuum ultraviolet (VUV), ultraviolet (UV), and visible regions. The excited states of the Sm2+ centers consisted of the lower 5 DJ (J = 0,1,2,3) multiplets and the higher lying 4f5 5d excited states. VUV or UV excitation directly into the 4f6 → 4f5 5d transitions of Sm2+ produced cascade emission from the metastable 5 DJ (J = 3,2,1,0) multiplets to the lowest 7 FJ (J = 0,1,2,3,4) multiplets at low temperatures. Energy transfer from Sm2+ to Sm3+ ions was observed in the excitation spectra of the Sm3+ emission. Excitation at 532 nm for a sample temperature of 300 K produced a broad emission band with a peak at 660 nm and sharp emission lines at 680, 692 and 738 nm, being due to Sm2+. 532 nm irradiation for 30 minutes decreased the intensity of the broadband to one-quarter of the initial intensity and increased slightly the intensities of the sharp lines.
Abstract
Three distinct Sm2+ impurity centers, a single Sm3+ impurity center, and a color center were identified in KY3F10 with 1 mol.% of Sm ion dopant by their emission and excitation spectra in the vacuum ultraviolet (VUV), ultraviolet (UV), and visible regions. The excited states of the Sm2+ centers consisted of the lower 5 DJ (J = 0,1,2,3) multiplets and the higher lying 4f5 5d excited states. VUV or UV excitation directly into the 4f6 → 4f5 5d transitions of Sm2+ produced cascade emission from the metastable 5 DJ (J = 3,2,1,0) multiplets to the lowest 7 FJ (J = 0,1,2,3,4) multiplets at low temperatures. Energy transfer from Sm2+ to Sm3+ ions was observed in the excitation spectra of the Sm3+ emission. Excitation at 532 nm for a sample temperature of 300 K produced a broad emission band with a peak at 660 nm and sharp emission lines at 680, 692 and 738 nm, being due to Sm2+. 532 nm irradiation for 30 minutes decreased the intensity of the broadband to one-quarter of the initial intensity and increased slightly the intensities of the sharp lines.
참고문헌 (11)
- G. Blasse, "Luminescent Materials" (1994), Springer-Verlag
- A. Osvet, , J. Lumin, 86, pp.323~332 (2000)
- X. Xue, , Appl. Phys. Express, 5, pp.092601~092603 (2012)
- P. Porcher, , J. Chem. Phys, 65, pp.89~94 (1976)
- J. -P. R. Wells, , J. Lumin, 85, pp.91~102 (1999)
- M. Yamaga, , J. Ceram. Process. Res. Special, 3, pp.S241~S245 (2011)
- E. Radzhabov, , J. Phys. : Condens. Matter, 13, pp.10955~10967 (2001)
- K. Shimamura, , J. Crystal Growth, 223, pp.383~388 (2001)
- K. Ito, , J. Alloys and Comp, 408-412, pp.766~770 (2006)
- L. C. Dixie, , J. Lumin, 132, pp.2775~2782 (2012)
- J.J. Markham, "F-centers in alkali halides" (1966), Academic Press