Abstract
Excited-states play a crucial role in the optical absorption and luminescence of solids and hence their accurate information is highly desired.Herein,we attempt to seize the excited-states information of Mn4+ions in K2SiF6 microcrystals via measuring and calculating their variable-temperature photoluminescence excitation(PLE)spectra.At cryogenic temperatures,an unpredicted splitting of the high-excited-state is observed.Moreover,the two-split high-excited-state levels are further revealed to primarily couple with the two hyperfine split modes of quasi-localized v2 vibration in the distorted Mn-F6 octahedral configuration,whereas the coupling strengths are found to be substantially different from each other.The slightly split vibrational mode is firmly supported by the low-temperature Raman spectra.Jahn-Teller lattice distortion is believed to be responsible for the observed splitting of the electronic high-excited-state and the quasi-localized vibrational mode.
基金项目
国家自然科学基金(12074324)
国家自然科学基金(11374247)
Science,Technologv,and Innovation Commission of Shenzhen Municipality(JCJY20180508163404043)
Science,Technologv,and Innovation Commission of Shenzhen Municipality(JCYJ20170818141709893)
万方数据