Optical images of (a) (room light), (b) (UV illumination), and (c) precipitates synthesized in Zn and Al immersed solutions, respectively.
SEM image of precipitate synthesized in Zn immersed solution.
(a) XRD pattern of precipitate synthesized in Zn immersed solution. The ASTM card patterns of and are also shown in the lower part. (b) XRD pattern of precipitate synthesized in Al immersed solution. The ASTM card pattern of is also shown in the lower part.
XPS survey spectra of (a) and (b) precipitates synthesized in Zn and Al immersed solutions, respectively.
Room-temperature PL spectra of precipitates synthesized by etching (a) Mg, (b) Fe, (c) Ni, and (d) Zn in solution. The red emission lines in (a)–(d) are produced by particles contained in the precipitate. No PL emission is observed from the precipitate synthesized in the Al immersed solution [(e)].
PL spectra of (a) at 80 K, (b) at 80 K (synthesized in our laboratory), and (c) reported by Pfeil (, Ref. 15).
Room-temperature PL spectra of some -activated hexafluorides [ , , , , , and ], together with those of - and . The red phosphors measured here were obtained in our laboratory.
Room-temperature PL and PLE spectra of . The PL spectrum was obtained by excitation at , while the PLE spectrum was measured by monitoring at . The vertical bars in the PLE spectrum show the results calculated using Eq. (6) with and 10 .
PL spectra of measured at (a) and (b) 300 K.
Temperature-dependent PL spectra of measured between and 300 K in steps of 20 K.
Integrated PL intensity vs temperature of . The solid line represents the result calculated using Eq. (7).
Summary of crystal classes, space groups, ZPL emission intensities, piezoelectricity (PZ), and optical rotation (OR) activities in some -activated hexafluoride phosphors. “” and “−” indicate that the intensities/phenomena are strong and weak (or principally forbidden), respectively.
Vibronic frequencies in and (in ).
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