INFLUENCE OF HIGH PRESSURE ON EMISSION SPECTRA AND CRYSTAL FIELD STRENGTH FOR Eu3+ IN GdOBr |
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Affiliation: | National Laboratory of Superhard Materials, Jilin University, Changchun 130023, China; Changchun Institute of Physics, Academia Sinica, Changchun 130021, China |
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Abstract: | 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 Bkq and the crystal-field strength parameter S versus Bkq 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. |
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