Wet chemical synthesis of Eu2+ activated fluoro-elpasolite phosphors

• First report on precipitation synthesis of elpasolite.
• First report on Eu2+ emission in K2NaAlF6 and K2LiAlF6 elpasolites.
• Strong Eu2+ emission in K2NaAlF6 and K2LiAlF6 observed.
• UV emission comparable to that of commercial phosphor (Sylvania 2052).

A simple precipitation synthesis of fluoro-elpasolites is reported for the first time. X-ray diffraction results show phase formation for K2NaAlF6 and K2LiAlF6 precipitated from aqueous solutions. Intense Eu2+ emission in both the hosts is also reported for the first time. K2NaAlF6 exhibits both line and band emissions which are attributed to Eu2+ at K+ and Na+ sites, respectively. Only line emission is observed for K2LiAlF6. The emission is very strong, intensity being comparable to that of a commercial UV lamp phosphor. The photoluminescence spectra are explained on the basis of the known energy level scheme for Eu2+. It is suggested that fluoro elpasolite phosphors obtained by the new route can be useful for making further studies on these phosphors.

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