ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 35, (3) 193 - 200 (1991)


SOME FINDINGS ON BLUE EMITTING LUMINOPHORE BASED ON (Ba, Eu²⁺) Mg ALUMINATE
 
Ondráček Jan, Hájek Bohumil
 
Department of Inorganic Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czechoslovakia

The currently used blue emitting luminophore was proved not to contain the (Ba, Eu)Mg₂Al₁₆O₂₇ aluminate as is often stated in the literature. An initial mixture, corresponding by its composition to the formula given above, yields a mixture of α-Al₂O₃ and the aluminate Ba0.72(1-x)Eu0.72xO0.28 Mg1.44Al10.08O17(Ba1-xEuxMg₂Al₁₄O₂₄) with a structure of β-Al₂O₃. The structure was found to contain arranged OBa atoms and was compared to the structure of similar aluminates. The luminophore is conveniently prepared by heating the coprecipitated hydroxides or hydrated oxides at 800-1000 °C and subsequent igniting in a mildly reducing atmosphere (N₂ + H₂) at high temperatures. In access of atmospherical oxygen, the Eu³⁺ containing aluminate being formed is stabilized by additional O atoms built into its structure. The luminophore exhibits maximum emission in the blue region at an Eu²⁺ content of x = 0.11.


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