Luminescent properties of Tm³⁺/ Ho³⁺ co-doped LiYF₄ crystals

Abstract

Ho³⁺ with various concentrations and Tm³⁺ with molar concentration of 1.28% are co-doped in LiYF₄ (YLF) single crystals. The luminescent properties of the crystals are investigated through emission spectra, emission cross section and decay curves under the excitation of 808 nm. The energy transfer from Tm³⁺ to Ho³⁺ and the optimum fluorescence emission of Ho³⁺ around 2.05 μm are investigated. The emission intensity at 2.05 μm keeps increasing with the molar concentration of Ho³⁺ improved from 0.50% to 1.51% when the molar concentration of Tm³⁺ is kept at 1.28%. Moreover, for the co-doped crystals in which the molar concentrations of Tm³⁺ and Ho³⁺ are 1.28% and 1.51%, respectively, the maximum emission cross section reaches 0.760×10⁻²⁰ cm² and the maximum fluorescence lifetime is 21.98 ms. All the parameters suggest that these materials have more advantages in the future 2.0 μm laser applications.

Keywords

Molar Concentration / Decay Curve / Emission Cross Section / Upconversion Luminescence / Energy Transfer Upconversion

References

[1] YangK J, HeineckeD C, KölblC, DekorsyT, ZhaoS Z, ZhengL H, XuJ, ZhaoG J. Optics Express, 2013, 21: 1574

[2] LiM, GuoY, BaiG, TianY, HuL, ZhangJ. Journal of Quantitative Spectroscopy and Radiative Transfer, 2013, 127: 70

[3] WangX, FanX, GaoS, LiK, HuL. Ceramics International, 2014, 40: 9751

[4] ZhangX L, LiL, ZhengY, WangY Z. Journal of Optical Society of America B, 2009, 26: 2434

[5] FeaverR K, PetersonR D, PowersP E. Optics Express, 2013, 21: 16104

[6] NiuN, HeF, WangL Z, WangL, WangY, GaiS L, YangP P. Journal of Nanoscience and Nanotechnology, 2014, 14: 3509

[7] BrenierA, RubinJ, MoncorgeR, PedriniC. J. Phys. France, 1989, 50: 1463

[8] FangQ, ChenH, XuF, WangS, LiangZ, JiangC. Chinese Optics Letters, 2010, 8: 1071

[9] LiS S, XiaH P, FuL, DongY M, GuX M, ZhangJ L, WangD J, ZhangY P, JiangH C, ChenB J. Chinese Physics B, 2014, 23: 107806

[10] PengB, IzumitaniT. Optical Materials, 1995, 4: 797

[11] WalshB M, BarnesN P, BartoloB D. J. Appl. Phys., 1998, 83: 2772

[12] ÖzenG, LuS S. Optics Communications, 2000, 180: 323