Biphase tricalcium phosphate white phosphor as well as in-situ synthesis method and application thereof

A biphasic tricalcium phosphate white, in-situ synthesis technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of complex process, large equipment investment, process pollution, etc. Small investment, no effect of process pollution

Inactive Publication Date: 2018-12-21
SUZHOU DINGAN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing matrix, when Eu 2+ When used as an activator for phosphors, it generally needs to be synthesized under a reducing atmosphere. Therefore, the process is complicated, the quality control is difficult, and the investment in equipment is large.
At the same time, due to the different composition and synthesis process of the existing red, green, and blue three primary color phosphors, each phosphor needs to be prepared separately. The preparation process is complicated, time-consuming and energy-consuming. White phosphors can only be obtained by mixing different types of phosphors, which not only increases the complexity of the process and the difficulty of controlling quality stability, but also brings process pollution and increases costs.

Method used

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  • Biphase tricalcium phosphate white phosphor as well as in-situ synthesis method and application thereof
  • Biphase tricalcium phosphate white phosphor as well as in-situ synthesis method and application thereof
  • Biphase tricalcium phosphate white phosphor as well as in-situ synthesis method and application thereof

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preparation example Construction

[0031] An in-situ synthesis method of biphasic tricalcium phosphate white fluorescent powder, comprising the following steps: using a compound containing calcium ions, a compound containing phosphorus or calcium-phosphorus ions, and a compound containing europium ions as raw materials, according to the general chemical formula Ca 3-x Eu x (PO 4 ) 2 The molar ratio of each element in the method weighs the raw materials, grinds and mixes them evenly, and then calcines them at high temperature in an oxygen-rich atmosphere (such as air or oxygen or other oxygen-rich atmospheres). The calcination temperature is 1100-1650°C and the calcination time is 0.5-24 hours. , and finally, in situ synthesis of Eu by a controlled cooling process 2+ and Eu 3+ The color coordinates of the co-activated biphasic calcium tricalcium phosphate white phosphor are (0.287-0.345, 0.297-0.360).

[0032] Further, the compound containing calcium ion is calcium carbonate (CaCO 3 ), calcium bicarbonate (...

Embodiment 1

[0039] Preparation of Ca 2.97 Eu 0.03 (PO 4 ) 2 Biphasic tricalcium phosphate white phosphor

[0040] According to the chemical formula Ca 2.97 Eu 0.03 (PO 4 ) 2 The stoichiometric ratio of each element in the 3 : 0.971 g, europium oxide Eu 2 o 3 : 0.053 g, calcium hydrogen phosphate CaHPO 4 2H 2 O: 3.442 grams, ground and mixed in an agate mortar, then calcined in an air atmosphere at a temperature of 1400°C, and calcined for 5 hours. The cooling rate is rapidly cooled to room temperature, and then pulverized and ground to obtain Eu 2+ and Eu 3+ Co-activated biphasic calcium tricalcium phosphate white phosphor.

[0041] figure 1 The Ca prepared according to the technical scheme of this embodiment is given 3-x Eu x (PO 4 ) 2 The X-ray powder diffraction pattern of the α-tricalcium phosphate standard card PDF#290359 and the β-tricalcium phosphate standard card PDF#090169 are relatively visible. The prepared white phosphor is a single-component biphasic trical...

Embodiment 2

[0044] Preparation of Ca 2.94 Eu 0.06 (PO 4 ) 2 Biphasic tricalcium phosphate white phosphor

[0045] According to the chemical formula Ca 2.94 Eu 0.06 (PO 4 ) 2 The stoichiometric ratio of each element in the 3 : 0.941 g, europium oxide Eu 2 o 3 : 0.106 g, calcium hydrogen phosphate CaHPO 4 2H 2 O: 3.442 grams, ground and mixed in an agate mortar, then calcined in an air atmosphere at a temperature of 1400°C, and calcined for 5 hours. The speed is rapidly cooled to room temperature, and then pulverized and ground to obtain Eu 2+ and Eu 3+ Co-activated biphasic tricalcium phosphate white phosphor, in which α- and β-Ca 3-x Eu x (PO 4 ) 2 The two phase contents were 66% and 34%, respectively. Using 365nm near-ultraviolet light as the excitation light source, the biphasic tricalcium phosphate emits white light, and the CIE color coordinates are x=0.335, y=0.345, and can be used as LED white fluorescent powder and bioluminescent marker.

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Abstract

The invention relates to the technical field of near UV excited inorganic light emitting materials, in particular to Eu<2+> and Eu<3+> co-activated biphase tricalcium phosphate white phosphor as wellas an in-situ synthesis method and an application thereof. A matrix of the white phosphor is formed through biphase in-situ composition of alpha-tricalcium phosphate and beta-tricalcium phosphate andhas the chemical formula of Ca(3-x)Eux(PO4)2, wherein x is larger than or equal to 0.001 and smaller than or equal to 0.3, and the mole ratio of (Ca+Eu)/P atoms is 1.45-1.55. The white phosphor has the characteristics of single chemical composition, high color purity and color saturation and the like, the color temperature of the while phosphor can be flexibly and conveniently regulated through process control, the light emitting quality is high and the performance is stable. The white phosphor can be used as near UV excited LED white phosphor, has good biocompatibility and high light emittingintensity and can be used as a biofluorescence marker. The provided in-situ synthesis method has the characteristics of being low in equipment input, simple in process, energy-saving, environmentallyfriendly, pollution-free in the process and the like.

Description

technical field [0001] The invention relates to the technical field of near-ultraviolet light-excited phosphorescent materials, in particular to a Eu 2+ and Eu 3+ Co-activated biphasic calcium tricalcium phosphate white phosphor and its in-situ synthesis method and application. Background technique [0002] There are three main white LED manufacturing technologies: blue LED chip with yellow phosphor, blue LED chip with red and green phosphor, and ultraviolet UV or near ultraviolet n-UV diode chip with red, green and blue three primary color phosphors. Currently, blue light diode chips and yellow light YAG:Ce 3+ A single-chip white light LED made of a combination of phosphors. However, this product has the defect of poor color rendering due to the lack of red light. The solution is to add red phosphors to it to obtain high color rendering index. Another method for preparing white LEDs is to use ultraviolet (UV) or near-ultraviolet light diode chips with red, green and blu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81H01L33/50
CPCC09K11/7738H01L33/502Y02B20/00
Inventor 仝超李亚东徐传艳
Owner SUZHOU DINGAN ELECTRONICS TECH
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