Excited States of 3d3 Electrons in K2SiF6:Mn4+ Red Phosphor Studied by Photoluminescence Excitation Spectroscopy

概要

論文の詳細を見る
This paper reports on a study of the photoluminescence excitation (PLE) spectra of Mn4+-activated K2SiF6 phosphor at 20 and 300 K. Measurements of the PLE spectra show that the sharp red emissions ($\text{$^{2}$E$_{\text{g}}$} \rightarrow \text{$^{4}$A$_{\text{2g}}$}$) at ${\sim}630$ nm are most efficiently excited by irradiation into the spin-allowed transitions $\text{$^{4}$A$_{\text{2g}}$} \rightarrow \text{$^{4}$T$_{\text{2g}}$}$ (${\sim}460$ nm) and $\text{$^{4}$A$_{\text{2g}}$} \rightarrow \text{$^{4}$T$_{\text{1g}}$}$ (${\sim}360$ nm). The first efficient excitation band $\text{$^{4}$A$_{\text{2g}}$} \rightarrow \text{$^{4}$T$_{\text{2g}}$}$ is structureless at 300 K but shows a sharp origin and some oscillatory peaks at 20 K. A Fourier transform technique is used for analyzing such oscillatory peaks. The second excitation band $\text{$^{4}$A$_{\text{2g}}$} \rightarrow \text{$^{4}$T$_{\text{1g}}$}$ shows a structureless shape even at a low temperature (20 K). The third excitation band with a peak at ${\sim}250$ nm is very weak and could be assigned as the $\text{$^{4}$A$_{\text{2g}}$} \rightarrow \text{$^{4}$T$_{\text{1g}}$}$ transition. The direct excitation of the 2E\text{g state is also found to produce the sharp red emissions at ${\sim}630$ nm with a negligibly small offset in the configurational coordination. The Franck--Condon analysis makes it possible to accurately determine the zero-phonon line energies in the 3d3 electron transitions of the MnF62- octahedron.
2011-09-25

Excited States of 3d3 Electrons in K<sub>2</sub>SiF<sub>6</sub>:Mn4+ Red Phosphor Studied by Photoluminescence Excitation Spectroscopy

スポンサーリンク

概要

著者

関連論文

スポンサーリンク