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Alkaline earth metal silicate-luminophore and method for improving the long-term stability of an alkaline earth metal silicate- luminophore

A technology for alkaline earth metals and luminescent substances, applied in chemical instruments and methods, luminescent materials, fibrous fillers, etc., can solve the problems of loss of strength of alkaline earth metal orthosilicate-luminescent substances, etc.

Active Publication Date: 2021-05-28
LEUCHTSTOFFWERK BREITUNGEN GMBH (DE)
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  • Application Information

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Problems solved by technology

Therefore, in the case of reactions carried out in the presence of water, decomposition and thus loss of strength of the alkaline earth metal orthosilicate-luminescent species is expected

Method used

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  • Alkaline earth metal silicate-luminophore and method for improving the long-term stability of an alkaline earth metal silicate- luminophore
  • Alkaline earth metal silicate-luminophore and method for improving the long-term stability of an alkaline earth metal silicate- luminophore
  • Alkaline earth metal silicate-luminophore and method for improving the long-term stability of an alkaline earth metal silicate- luminophore

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Embodiment Construction

[0068] figure 1 A device for carrying out a preferred embodiment of the method according to the invention for improving the long-term stability of alkaline earth metal silicate phosphors is shown. The device comprises a reaction chamber 01 in which the alkaline earth metal silicate luminophore to be treated is located in the form of grains (not shown). The reaction chamber 01 is heated by a furnace heater 02 .

[0069] The device also includes a first bubbler 03 for heating trimethylaluminum or other organoaluminum compounds and for passing the trimethylaluminum with a first carrier gas, said The first carrier gas optimally consists of nitrogen. The carrier gas is provided by the first carrier gas source 04 and introduced into the first feed pipe 07 through the first front-side short-circuit valve 06 , and the first feed pipe 07 leads into the inner space of the first bubbler 03 . The first discharge pipe 08 enters the reaction chamber 01 from the inner space of the first b...

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Abstract

The present invention relates to a method for improving the long-term stability of an alkaline earth metal silicate-luminophore. The luminophore is formed in the form of grains and has a basic grid of the general chemical formula EAxSiyOz with x, y, z > 0. The component EA is formed by one or more alkaline earth metals. An activator is doped into the basic grid. In a step of the method, the grains of the luminophore are heated in a reactor chamber (01). A volatile organoaluminum compound is heated and flowed through with a first carrier gas, as a result of which a first carrier gas mixture containing the volatile organoaluminum compound is obtained. In addition, water is heated and a second carrier gas flows through, as a result of which a second carrier gas mixture containing the water is obtained. The first carrier gas mixture and the second carrier gas mixture are introduced into the reactor chamber (01) where the grains of the alkaline earth metal silicate luminophore are enveloped by the carrier gas mixtures. As a result, the volatile organoaluminum compound and the water react with one another at least predominantly to form aluminum oxide hydroxide which forms a coating of the grains of the alkaline earth metal silicate luminophor. The invention further relates to an alkaline earth metal silicate-luminophore.

Description

technical field [0001] The invention firstly relates to a method for increasing the long-term stability of an alkaline earth metal silicate luminescent substance by coating the alkaline earth metal silicate luminescent substance in the form of grains. Alkaline earth metal silicate luminophores are used, for example, as conversion luminophores in white LED-based light sources. The invention also relates to alkaline earth metal silicate phosphors. Background technique [0002] Alkaline-earth metal silicate luminophores have a marked instability with respect to moisture, which has hitherto severely limited their usability in many applications. The following chemical reactions are considered to be undesirable reactions of alkaline earth metal orthosilicate-luminescent substances mainly caused by moisture: [0003] (Ba,Sr,Ca) 2 SiO 4 +2H 2 O→2(Ba,Sr,Ca)(OH) 2 +SiO2 2 [0004] Alkaline earth metal silicate-luminescent substances tend to aggregate and agglomerate during pro...

Claims

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Application Information

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IPC IPC(8): C09K11/77C09K11/02C09C1/30C09C3/06
CPCC09C3/06C09C1/30C09K11/025C09K11/77342Y02B20/00C09C1/3054C09C3/063
Inventor 西尔克·罗斯勒安妮·施密特多米尼克·乌利希
Owner LEUCHTSTOFFWERK BREITUNGEN GMBH (DE)
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