INFLUENCE OF HIGH PRESSURE ON EMISSION SPECTRA AND CRYSTAL FIELD STRENGTH FOR Eu3+ IN GdOBr

The emission spectra of the Eu³⁺ion in GdOBr∶Eu³⁺ were measured in the range of pressure from 0 GPa to 12.4 GPa. The energy level schemes establis hed from the spectra show that the splittings of the ⁷F₁,⁷F₃ and ⁵D₁ multiplets decrease obviously with increasing pressure. The crystal-field parameters B^k_q and the crystal-field strength parameter S versusB^k_q were determined at different pressures. With pressurization S reduces and theJ-mixings of the state functions for the Eu³⁺ ion decrease, which is in agreement with the decrease of the multiplet splittings. This shows that for Eu³⁺ in REOX∶Eu³⁺ the diminution of the crystal-field strength with pressure, the authenticity of which is under suspicion for several years, is certain.     

GdOBr:Eu荧光谱的高压研究

本文在室温下测量了GdOBr:Eu的常压和高压荧光谱,光谱范围在13000～21500cm-1之间,压力至12GPa.常压下,清晰可辨的荧光谱线共有43条,这些谱线由Eu3+4f6组态内5D0-2至7F0-5的跃迁产生。由荧光谱线得到26个晶场能级(Stark能级).谱线绝大部分随压力红移,少数几条谱线随压力先蓝移后红移。所有谱线的强度随压力升高而减弱。7F0-5的能级随压力的变化规律比较复杂,而5D0-5各能级均随压力的升高几乎线性地降低。     

INFLUENCE OF HIGH PRESSURE ON EMISSION SPECTRA AND CRYSTAL FIELD STRENGTH FOR Eu3+ IN GdOBr

The emission spectra of the Eu³⁺ion in GdOBr∶Eu³⁺ were measured in the range of pressure from 0 GPa to 12.4 GPa. The energy level schemes establis hed from the spectra show that the splittings of the ⁷F₁,⁷F₃ and ⁵D₁ multiplets decrease obviously with increasing pressure. The crystal-field parameters B^k_q and the crystal-field strength parameter S versusB^k_q were determined at different pressures. With pressurization S reduces and theJ-mixings of the state functions for the Eu³⁺ ion decrease, which is in agreement with the decrease of the multiplet splittings. This shows that for Eu³⁺ in REOX∶Eu³⁺ the diminution of the crystal-field strength with pressure, the authenticity of which is under suspicion for several years, is certain.