A kind of single-matrix fluorescent powder for white light LED and preparation method thereof

Abstract

The invention discloses single-matrix fluorescent powder for a white light-emitted diode (LED) and a preparation method for the single-matrix fluorescent powder. According to the process, a high-temperature solid phase method is adopted. The chemical formula of the single-matrix fluorescent powder is M4-xNEuxV3O12, wherein M may be one, two or three of Ca, Sr, Ba and Mg, x is more than or equal to 0.02 and is less than or equal to 0.10, and N may be one of Li, Na and K. The single-matrix fluorescent powder consists of high-purity MCO3, N2CO3, NH4VO3 and Eu2O3 which serve as raw materials, wherein N2CO3 is used as a charge compensation agent, and Eu2O3 is used for providing activator ions. The fluorescent powder emits white light under the excitation of ultraviolet light, and the purity of the white light can be regulated by regulating the concentration of doped Eu3<3+> ions. The method is simple, and synthetic temperature is very low; and the fluorescent powder is high in granular dispersity and crystallinity, and has potential application prospect.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to the preparation of a single matrix fluorescent powder for white light LEDs and a preparation method thereof. Background technique [0002] Light Emitting Diodes (LED) is a new type of solid-state lighting device developed in recent years. It has attracted wide attention due to its high efficiency, long life, no pollution, and energy saving. At present, commercial white LEDs generally use a combination of blue chips and YAG: Ce yellow phosphor. Due to the lack of red components in this combination, the resulting white LED device has a low color rendering index and a high color temperature. [0003] The above problems can be solved by adding red powder, using near-ultraviolet chip to excite tri-primary toner, or preparing a new single-matrix white phosphor. The first two methods reduce light efficiency significantly due to reabsorption. Therefore, the preparation o...

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Problems solved by technology

[0004] Through the patent search, it is found that some researchers have already started the research work on single-matrix phosphors excited by near-ultraviolet, such as: patent CN200710047969, the precursor is prepared by rare earth nitrate co-precipitation method, and then prepared under the condition of 100-260 ℃ Although the tungstate series single-matrix phosphors have good particle performance and spectral performance, the complex process and the use of strong acid to prepare the precursor make this preparation method almost impossible to industrialize.

Another example: patent CN200910021829.9, a single-matrix white light phosphor AMgAl11O19 was prepared by a high-temperature solid-phase method, A is a rare earth ion selected from La 3+ , Ce 3+ , Y 3+ , Gd 3+ One or more combinations of them, the resulting product emits in both the blue light region and the green-red light region, and the overall compound emits white light, showing better luminous characteristics, but the excitation spectrum of the phosphor powder is distributed in the near ultraviolet and vacuum ultraviolet light area, which cannot be applied to white LEDs; another example: patent CN201110236483.1, which uses a hydrothermal method to prepare a single-matrix white LED phosphor Sr 2 A y CeO 4 : xB 3+ , A is one of Li, Na, Mg, B is one of Eu, Pr, Cr and Sm, under the excitation of ultraviolet light, it shows better white light characteristics, but the hydrothermal method requires higher equipment , the process is complex, and it is difficult to realize industrialization

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