Green emitting phosphor, light emitting device including the same, and liquid crystal display device including light emission device as backlight unit
A green phosphor, liquid crystal display technology, used in luminescent materials, optics, instruments, etc., can solve the problems of unsatisfactory efficiency and color characteristics of phosphorescent substances
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[0037] The green phosphor can be prepared by modifying a known preparation method, but the preparation method is not limited thereto. The green phosphor powder of Formula 1 can be prepared according to the following method.
[0038] First, an aqueous solution of a mixed metal salt was prepared by adding an aqueous solution of a metal salt including gallium and an aqueous solution of a metal salt including europium into a reactor and mixing them uniformly.
[0039] As metal salts, sulfates, nitrates, acetates or halides including gallium or europium can be used. However, the kind of metal salt is not limited to specific salts. The importance of the salt is that the salt is soluble in water since the salt is only a delivery system for the metal ions. According to aspects of the invention, nitrates are used.
[0040] The content of gallium salt and europium salt in the mixed metal salt aqueous solution is controlled to satisfy the stoichiometric ratio defined in Formula 1.
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Embodiment 1
[0082] Example 1: Sr 0.95 Ba 0.05 Ga 2 S 4 :0.04Eu 2+ Phosphor powder preparation
[0083] By mixing gallium nitrate (Ga(NO 3 )3 ) and europium nitrate (Eu(NO 3 ) 3 ) and ammonium hydroxide was added thereto to obtain gallium-europium hydroxide (Ga(OH) 3 / Eu(OH) 3 )Precipitate.
[0084] Sr was prepared by collecting this precipitate and adding strontium oxide and barium oxide to it 0.95 Ba 0.05 Ga 2 S 4 :0.04Eu 2+ Precursors of phosphors. The amounts of barium oxide and strontium oxide were controlled so that the molar ratio of strontium:barium:gallium was 0.95:0.05:2.
[0085] Subsequently, the precursor was dried in an oven, pulverized, and baked in a tube furnace at 800° C. for 5 hours under a hydrogen sulfide atmosphere to prepare barium strontium thiogallate phosphor.
Embodiment 2
[0086] Example 2: Sr 0.90 Ba 0.1 Ga 2 S 4 :0.04Eu 2+ Phosphor powder preparation
[0087] Phosphor powder was prepared by the same method as in Example 1, except that the amount of barium was changed to 10 mol%.
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