Orange emission from (Ba1-XSrX)4Al 2S7:Eu2+ thioaluminate phosphors with visible light excitation

Takahiko Hasegawa, Hideki Kato, Yuji Takatsuka, Makoto Kobayashi, Hisanori Yamane, Masato Kakihana

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11 Citations (Scopus)


Solid solutions of (Ba1-XSrX)4Al 2S7 (X = 0.2 to 0.6) novel thioaluminate compound were synthesized, whose crystal structure was determined. The crystal structure of the (Ba1-XSrX)4Al2S7 solid solution is related to that of monoclinic Ba4Ga 2S7 consisting of isolated Ga2S7 units. However, the local structures around Ba/Sr in (Ba1-XSr X)4Al2S7, such as coordination number and one unusually long bond (d(Ba,Sr)-S 4 Å) in 7- and 8-coordinated (Ba,Sr)-S, are different from those in Ba4Ga 2S7. Eu2+-activated (Ba1-XSr X)4Al2S7 exhibited orange emission with a peak maximum at 594 nm and a corresponding excitation band at 300 to 550 nm. This is the first report of an orange phosphor in the thioaluminate system. The thermal quenching of luminescence in the (Ba1-XSr X)4Al2S7:Eu2+ phosphor was comparable to that in a conventional Y3Al5O 12:Ce3+ phosphor.

Original languageEnglish
Pages (from-to)R3107-R3111
JournalECS Journal of Solid State Science and Technology
Issue number2
Publication statusPublished - 2013


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