Single matrix white phosphor and preparation method thereof

Abstract

The invention provides single matrix white phosphor and a preparation method thereof. The chemical expression of the phosphor is (SryBa1-x-y)(MgmZn1-m-p-q)2(PO4)2:xEu,pMn,qTb, wherein x is greater than 0 and less than 0.1; y is greater than 0 and less than 1; m is greater than 0 and less than 1; p is greater than 0 and less than 0.1; and q is greater than 0 and less than 0.1. The phosphor prepared by the method is fine and uniform in granules, can emit red, green and blue bands after being excited by 350-410nm near ultraviolet and can be used for the white LED excited by the near ultraviolet.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a single-matrix white light fluorescent powder for near-ultraviolet excited white LEDs and a preparation method thereof. Background technique [0002] Light-converting white light LED has the advantages of power saving, small size, low calorific value, long life, fast response, shock resistance, recyclability, pollution-free, planar packaging, and easy development into light, thin and short products. It is the most promising LED in the 21st century. A new light source of value. [0003] At present, commercialized light-converting white LEDs mainly use blue LED chips as the basic light source to excite yellow phosphors, and use the lens principle to mix complementary yellow light and blue light to obtain white light. This method has a simple structure and low manufacturing process requirements, but the luminous color of the obtained white LED will vary with...

AI Technical Summary

Problems solved by technology

For example, the CaLaGa reported by Zhao Wenyu et al. (Science Bulletin, 2012,57:189-193) 3 o 7 : Dy 3+ Phosphor, and BaSrMg(PO 4 ) 2 :Eu 2+ It belongs to the multi-site single-matrix phosphor. The emission spectrum of this type of phosphor is mixed with blue light and yellow light to form white light. Because there is only one activator, its color matching is more difficult.

SrZn reported by Linghong Yi et al. (Materials Science and Engineering B, 2010,172:132-135) 2 (PO 4 ) 2 :Eu 2+ ,Mn 2+ , Zhiping Yang et al. (Journal of Al loys and Compounds, 2011, 509:76-79) Ba 1-x Mg 2-y (PO 4 ) 2 :xEu 2+ ,yMn 2+ , Sr disclosed in Chinese Patent Application No. 200910272541.9 2-m Mg 3-n P 4 o 15 :Eu m 2+ ,Mn n 2+ Equal energy transfer single-matrix phosphors have only two light-emitting centers, blue and red, and the color rendering of LEDs formed by packaging is not high; there are not many reports on single-matrix phosphors with three activators. Guogang Li et al. (ACS Appl .Mater.Interfaces, 2012, 4:296-305) reported Ca 4 Y 6 (SiO 4 ) 6 O:Ce 3+ / Mn 2+ / Tb 3+ Phosphor, BaMg reported by Wei Lü et al. (Inorg.Chem.2011, 50, 7846-7851) 2 Al 6 Si 9 o 30 :Eu 2+ ,Tb 3+ ,Mn 2+ Phosphor, Sr reported by Xi Chen et al. (Journal of Luminescence, 2011, 131:2697-2702) 1.5 Ca 0.5 SiO 4 :Eu 3+ ,Tb 3+ , Eu 2+ Phosphor powder, this type of single-matrix phosphor has a high color rendering index, but most of them are silicate borate matrix, and its synthesis method is mostly limited to solid-phase sintering method, the preparation temperature is high, the shape is uneven, and the phosphor particles The diameter is large, and multiple ball milling is required, and ball milling will reduce the luminous intensity of the phosphor; the Chinese patent application number 201210110827.9 discloses a single-matrix white light phosphor for near-ultraviolet excitation white light LEDs, and its chemical expression is: NM 1-x-y-z PO 4 : xR, yG, zB, wherein N is selected from at least one of the group consisting of Li, Na, K; M is selected from at least one of the group consisting of Mg, Ca, Sr, Ba, Zn; R is selected from At least one of the group consisting of Mn, Sm; G is Tb; B is at least one of the group consisting of Ce, Eu, and 0<x<0.25,0<y<0.25,0<z <0.25, the sol-gel method is adopted, the manufacturing process is relatively complicated, and the preparation cycle is relatively long