Abstract
The Cr3+-activated phosphor properties are discussed in detail from an aspect of spectroscopic point of view. The host materials considered here are a various kind of fluoride compounds. The photoluminescence (PL) and PL excitation spectra of such Cr3+-activated fluoride phosphors are analyzed based on Franck−Condon analysis within the configurational-coordinate model. A method is proposed for obtaining reliable crystal-field (Dq) and Racah parameters (B and C) based on a general ligand field theory with paying an attention to difficulty in the exact estimation of such important ligand field parameters. The intra-d-shell Cr3+ states, such as 2 Eg (2 G), (4 F), and (4 F), in various fluoride hosts are determined and plotted against Dq in the Tanabe−Sugano energy-level diagram. A comparative discussion of Cr3+ and Mn4+ as efficient activator ions for near-IR and red-emitting phosphors is given. Key properties of the Cr3+-activated fluoride phosphors are also presented for use of such near-IR or red-emitting fluoride phosphors in future light-emitting and related device applications.
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.
