Some studies about the green and red light emitting structures in NaCl1−xBrx:Mn2+

Study of NaCl:Mn2+ nanostructures in the Suzuki phase by optical spectroscopy and atomic force microscopy

“…At RT, it exhibits two distinctive bands: a green emission band at 508 nm (0.16 eV, FWHM) and a broader red emission band at 610 nm (0.21 eV, FWHM) for an excitation wavelength at 230 nm. These bands have been previously reported [18,19], where the green emission band was associated with SP and the other band with IV dipole complexes (manganese aggregates). The emission spectrum obtained in real time as a function of temperature is displayed in Fig.…”

“…Fig. 3(a) provides details of the excitation peak at 232 nm (0.55 eV, FWHM), which has been also associated with the double excitation mentioned previously, arising from two close Mn 2 þ ions [16][17][18][19]. This luminescent center at Fig.…”

“…NaCl:Mn 2 þ single crystals have been studied by several experimental techniques such as ionic conductivity [14], optical absorption [15], photoluminescence [16][17][18][19], and magnetic techniques [20][21][22], among others. From these, it is well recognized that the Mn 2 þ ion is an active phosphor and that its emission peak is related to its coordination state giving a red emission at approximately $ 610 nm for six-fold coordination (strong crystal field), and a green emission $ 508 nm, for four-fold coordination (weak crystal field) [23][24][25].…”