SU390126A1 - METHOD OF OBTAINING ZINC SULPHIDE LUMINOPHOR - Google Patents

Description

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SUBSTANCE: invention relates to the field of 1shn K ulfD | Nyh electroluminors.

A well-known method for producing sulphide luminescent nanophores consists in calcining a QuietTi1 compiled according to an IST formula in the presence of a mineralizer (a mixture of sulfur and ammonium halogenide) introduced into the reaction mixture during calcination with the help of an amber mixture: .

The disadvantages of the known method (and is the low brightness of the phosphor, and that: too, the complexity of the process, due to the need for a continuous supply of strictly determined amount of Barrier from the aor.

The proposed method differs from the known principle that the mineralizer is introduced into the mixture before calcining, and the process is carried out under the conditions of circulation of mineral oil, which is caused by temperature differences from 850-1000 ° C to 340-445 ° C.

The terrible difference between the two manufacturers increases the brightness of the phosphor by 5–15% and improves its quality, as well as the simplification of the technological process. Data indicating the improvement of the quality of the phosphor is shown in the table.

In our proposed method, an atmosphere is needed (In the reaction zone, it is created due to the sulfur boiling and the dissociation of ammonium halides, which are a composite number

The chemicals that are introduced are immediately reacted in quantities sufficient to maintain the desired composition of the atmosphere during the entire calcination time.

The temperature in the reaction zone (determined by the type of phosphor synthesized) is maintained at 850-1000 ° C. At this temperature, sulfur and ammonium halides, the boiling and sublimation temperatures of which lie within 395-445 ° C, are completely evaporated already at the stage of fueling the charge and, if not taken special measures, in a short time, much less than necessary for the process of forming the phosphor, completely volatilized from the reaction zone. So that the content of these substances, in the atmosphere of the reaction zone, is sufficient throughout the whole process of the formation of the phosphor, the process is led to the recovery and circulation of the mineralizer.

To illustrate the rokali process, a drawing is shown showing the location of the vessel in the furnace, made in the form of a long-necked flask, and also shows the process zones.

The calcination of the mixture is carried out in a vessel /, placed in the furnace 2. The reaction vessel is closed with quartz glass 3.

The drawing also clearly shows the reaction zone 4 and the condensation zone 5.

Sulfur and mmonium halide condensate in the part of the vessel protruding from the furnace (s-condensation 5).

In order to ensure the normal functioning of the zoo's condene; sa: Cii, its temperature should be about 340 ° C (the temperature at which the sulfur becomes: T Movable), and the Bottom temperature is -445 ° C (sulfur temperature). At such a temperature, the sulfur mode and ammonium halides are condensed in the condensation zone, and its walls flow down into the hot zone (ammonium halides are captured by liquid sulfur), evaporated again and the steam process is evaporated.

It should be noted that the specified temperature regime in the condensation zone is established and maintained self-arbitrarily due to the heat released by the condensation of the para-B. A prerequisite for this is the presence in the system of a sufficient number of ionderizing substances. This conditionally lasts if the total weight of sulfur and the halogenide is equal to 1MM01Ni to the area of the inside-surface of the part of the vessel exiting the furnace is 0.04-0.10 g / cm. In addition, it was found that the oasud from the furnace should be no more than 40 cm, the total content of sulfur and ammonium halides should be 5–20% (better than 8–10%), the height of the layer (in the vessel Must not exceed 12 cm, the temperature of the air surrounding the protruding part of the vessel should be 15-30 ° C.

Example 1. Getting luminophore with a green glow.

In the quartz vessel is placed 100-300 g of the mixture of the following composition (grams)

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2.0-10-3 1.5-10-2 0.5-10-2 8.0-10-2

The vessel is placed in stacioma, placed vertically in a pre-heated oven and kept with it at a temperature of 900 ° for 60-70 minutes. After this time, the vessel is removed from the furnace and cooled in air to room temperature. The cool phosphor is sieved, washed by excess MEDI and one of the known SP.oooob from excess MEDI.

Ex. 2. Preparation of an elvktrolk minofor with a blue luminescence.

In a quartz vessel is placed 100-300 g of powder of the next co-st-ava (grams)

10-, 10-2 .10-2

Next, the process is carried out as described in Example 1.

Example 3. Preparation of electrolumine25 porosity with yellow color.

In .quartz cousin and substitute 100-300 g of batch of the following composition (grams)

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1 -10-3 1.2-10-2 0.5-10-2 1.5-10-2 8.0-10-2

The process is then carried out in the same manner as indicated in 1.

The comparative characteristics of the luminophore obtained by the known. And the preferred method are shown in the table.

Subject invention

The method of obtaining zinc sulfide lomino () ora by calcining the mixture using a mineralizer-mixture of sulfur and ammonium halides, characterized in that, in order to simplify the process and improve the quality of any, mnofor, the mineralizer is introduced into the mixture before procuring , and the process is carried out in the conditions and circulation of the mineralizer, due to the temperature drop from 850-1000 ° C to 340-445 ° C.

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