Abstract
A review of the optical properties of Mn4+ ions in a number of host lattices is presented. As an example, detailed crystal field calculations of the Mn4+ energy levels in Na2SiF6 and K2SiF6 are reported and compared with the literature experimental data. Special attention is paid to the crystal field analysis of the observed features in relation to the structural data and peculiar features of the chemical bonding. A simple criterion is proposed, which can effectively and easily describe ionicity/covalency of the Mn4+-doped crystals. This criterion is based on the position of the sharp spin-forbidden 2Eg→4A2g emission line transition: if it is located above 15500cm−1 (below ∼645nm), the bonding is essentially ionic, while its location below 15500cm−1 (above ∼645nm), is suggestive of covalent bonding.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
