Preparation method for nitride fluorescent powder and equipment for same

Abstract

The invention discloses a method for preparing a nitride fluorescent powder by a high-temperature solid-phase method, and production equipment used for the method. The method comprises the following steps of: (1) detaching raw materials in an oxygen-free and water-free glove box, and mixing the raw materials in a mixing device arranged in the glove box; (2) transferring the mixed raw materials to a reduction furnace via a transition device under nitrogen protection, and solving the problems of other backflows and isolated heat transfer via a transition cabin; (3) calcining at a high temperature in a nitrogen / hydrogen atmosphere by adopting a subsection temperature control method in which three parts, a preheating area, a high-temperature area and a cooling area are formed; and (4) performing aftertreatment on the cooled sample in room-temperature air. By using the method and the equipment, the high-purity nitride fluorescent powder can be manufactured, and the central granularity of the fluorescent powder and the position of an emitting main peak can be controlled by adjusting the calcining temperature and the composition ratio of the raw materials respectively; and with the adoption of three-section calcining, preparation for the nitride fluorescent powder by the method can realize continuous production, thus greatly increasing production efficiency. The method is energy-saving, environment-friendly, and suitable for mass preparation for the nitride fluorescent powder.

Description

Technical field: [0001] The invention belongs to the field of luminescent material and equipment manufacturing, and particularly relates to a method for preparing nitride phosphors and manufacturing equipment thereof. Background technique: [0002] Light-emitting diodes (LEDs) are new solid-state lighting devices developed in recent years, which have the advantages of high efficiency, long life, no pollution, and energy saving. Countries around the world have invested a lot of manpower and financial resources in the research and development of white LEDs. At present, commercial white LEDs generally use the combination of blue chip + yellow phosphor YAG:Ce. This combination has high luminous efficiency. The disadvantage is that it lacks red light radiation, low color rendering index, high color temperature, and the oxide phosphor itself is hot. The stability is poor and cannot meet the requirements of high-power white light LEDs. Nitride red phosphor M 2 Si 5 N 8 : Eu (M=Ca, Sr,...

AI Technical Summary

Problems solved by technology

Although the patent mentions the synthesis of high-efficiency nitride phosphors, there is a problem of how to remove excess carbon in the synthesis of nitride phosphors by carbon reduction, and the insufficient reducing atmosphere makes doped Eu coexist in divalent and trivalent. The patent does not mention how to solve it, and this problem will directly affect the luminous efficiency of nitride phosphors; another example: patent application 200910147787.3, using oxide nitriding as a raw material method, adopting a high-temperature solid-phase method at 1300°C-1800°C Preparation of nitride phosphor M at ℃ 2-w Si x A y N z : w R (R=Eu, Sm, Ce) red phosphor, oxide nitriding can avoid the problem of easy oxidation of raw materials, but the use of oxide raw materials will cause a large amount of lattice oxygen to exist in the product, reducing the luminous intensity and thermal stability of the product Another example: patent application 201010602118.3, using a high-temperature solid-phase method to prepare nitride phosphors at 1350-2000 ° C and 5-200 atmospheres. powder to meet market demand for nitride phosphors

Images