Yb^(3+)和Er^(3+)共掺ZnF_2-AlF_3-PbF_2-LiF多晶和玻璃的光谱性质

Up-conversion Luminescence Properties of Yb-Er∶ZnF_2-AlF_3-PbF_2-LiF Ceramic and Glass

研究了 978nmLD激发下Yb3 + ,Er3 + 共掺新的氟化物基质 30ZnF2 2 5AlF3 30PbF2 1 5LiF多晶和玻璃中的上转换发光性质 ,分析了上转换发光的途径 ,重点讨论了多晶样品中红色上转换发光增强的过程和原因。最后解释了Er3 + 和Yb3 +

The up-conversion luminescence properties of Er-Yb codoped new fluoride ceramic and glass were studied. Intense violet, green and red up-conversion emissions were observed with 978nm LD as an excitation source. In comparison with the up-conversion spectrum of Yb-Er codoped systems reported previously, the violet and red emissions in our sample were enhanced greatly. The up-conversion emission spectra of ZAPL∶10% Yb 3+,5% Er 3+ glass and ceramic excited by 978nm LD laser were measured.The up-conversion emission spectra under different excitation densities for oxide-fluoride,glass(10% Yb,3%Er) and fluoride glass and ceramic(10% Yb,5%Er)were also presented in this paper. In order to clarify the enhancement mechanism, the excitation spectra with different wavelength were measured. The experimental results indicate that two cross-relaxation processes between Yb and Er: 4G 11/2→ 4F 9/2 (Er 3+) and 2F 7/2→ 2F 5/2 (Yb 3+), 2H 9/2→ 4F 9/2 (Er 3+) and 2F 7/2→ 2F 5/2 (Yb 3+) make the red up-conversion emissions enhanced greatly. The enhancement of violet emission is attributed to the low energy and narrow band phonon in our sample. We explain up-conversion fluorescence properties of Er-Yb co-doped oxide-fluoride vitro-ceramic excited by 978nm LD at the end.