Orange light phosphor powder for white light LED and preparing method thereof

Abstract

The invention relates to orange light phosphor for a white light LED, and belongs to the luminescent material technical field. The general formula is M2xyzP2O7: Eux, Mny and Dyz, wherein, M is anyone or the combination of the two of Ca, Sr and Ba; x is more than or equal to 0.001 and less than or equal to 0.05, y is more than or equal to 0.04 and less than or equal to 0.16, and z is more than or equal to 0 and less than or equal to 0.05. The preparation method of the orange light phosphor includes the following steps: the oxides or salts of each element are taken according to the general formula stoichiometric proportion, and are fully porphyrized and mixed uniformly, putted into a crucible, and sintered for 2 to 4 hours under the temperature of 1200 DEG C to 1300 DEG C and the reducing condition of carbon or hydrogen and nitrogen, so as to obtain a sintered body, and the oxides or the salts of each element is grinded into powder to obtain the orange light phosphor. The orange light phosphor can be matched with a near ultraviolet light-emitting diode for applying in a three primary color white light LED as the orange light phosphor ingredient, the preparation method is simple, no pollution exists and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a white LED orange phosphor suitable for excitation by near ultraviolet light and a preparation method thereof. Background technique [0002] White LED (Light Emitting Diode) has many advantages such as non-toxic, long life (100,000 hours), high efficiency and energy saving, all solid state, low working voltage, shock resistance and good safety, and can be widely used in various lighting facilities. Including indoor lights, traffic lights, street lights, automobile tail lights, direction lights, brake lights, large outdoor screens, display screens and advertising boards, etc., is an environmentally friendly, energy-saving green lighting source. [0003] At present, there are many schemes for realizing white light LED, but most of them are mainly based on the following three schemes. ①The blue LED chip and the yellow phosphor that can be effectively excited by blue li...

AI Technical Summary

Problems solved by technology

However, phosphors with excellent photoconversion efficiency and thermal stability, especially high-efficiency orange-red phosphors that can be effectively excited by blue light and near-UV light, are extremely scarce.

[0004] At the end of 2004, Korean researchers reported a single-phase white light phosphor suitable for near-ultraviolet excitation (J.S.Kim, P.E.Jeon, J.C.Choi, and H.L.Parka, S.I.Mho, G.C.Kim, Appl.Phys.Lett. Express, 84 volumes (15), 2931 pages, 2004), which consists of Ba 3 MgSi 2 o 8 :Eu 2+ , Mn 2+ , but the luminous efficiency of the red component that constitutes its white light is relatively low

This year, Japanese researchers reported a red phosphor suitable for excitation by near-ultraviolet light (Xianqing Piao, Takashi Horikawa, Hiromasa Hanzawa, and Ken-ichi Machida, Appl.Phys.Lett. Appl. , 2006), whose composition is Sr 2 Si 5 N 8 :Eu 2+ , but due to harsh experimental conditions and high cost, it is still only in the laboratory research and development stage

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