Rare earth europium activated molybdate-based red phosphor powder and preparation method thereof

Abstract

The invention discloses a rare earth europium activated molybdate-based red phosphor powder. Molybdate is used as a substrate; the chemical formula is K5Y1-x(MoO4)4:xEu3+, wherein x is more than or equal to 0.01 but less than or equal to 0.3; the activating ion Eu3+ is doped, so that the prepared rare earth europium activated molybdate-based red phosphor powder can be effectively matched with a present light emitting diode; the luminous efficiency is high; the rare earth europium activated molybdate-based red phosphor powder is suitable for serving as a red light component in white light LED, is high in light intensity and has excellent color rendering. The invention also discloses a preparation method thereof. The method comprises the following steps: mixing and grinding K2CO3, Y2O3, MoO3 and Eu2O3; calcining under air atmosphere; keeping heat; cooling following furnace and then grinding; lastly, acquiring the rare earth europium activated molybdate-based red phosphor powder. The preparation is based on a solid-phase compounding method. The method is simple and feasible, high in repeatability and short in preparation period.

Description

technical field [0001] The invention belongs to the technical field of preparation of rare earth luminescent materials, and in particular relates to molybdate-based red fluorescent powder activated by rare earth europium, and also relates to a preparation method of the red fluorescent powder. Background technique [0002] In the 21st century, LED lighting source has become the focus of people's attention due to its low energy consumption, small size and good stability, and is known as a new generation of lighting source. [0003] In white LEDs, the phosphor powder of the commercial red component has been prepared using alkaline earth metal sulfide as the matrix. However, the physical and chemical properties of this kind of phosphor are very unstable, the thermal stability is poor, the light decay is large, and the long-term use will release H 2 S gas corrodes components and seriously damages the quality of white LED lights. Therefore, the development of red luminescent mat...

AI Technical Summary

Problems solved by technology

At present, the research on molybdate-based phosphors is mainly focused on alkaline earth metal dimolybdates with a scheelite-like structure, such as: LiLa(MoO 4 ) 2 :Eu 3+ , NaLa(MoO 4 ) 2 :Eu 3+ , NaGd(MoO 4 ) 2 :Eu 3+ , KLa(MoO 4 ) 2 :Eu 3+ etc., but the luminous efficiency of these phosphors is still not up to the requirements of practical applications, so the development of new red phosphors for white LEDs has become a research hotspot at home and abroad.

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