Red fluorescent powder excitated by near-ultraviolet broadband and preparation method thereof

A red phosphor, broadband excitation technology, applied in the field of near-ultraviolet broadband excited red phosphor and its preparation, can solve the problems of restricted conversion effect, weak excitation intensity, low excitation efficiency, etc., and achieves easy operation, simple preparation method, Good heat and radiation resistance

Active Publication Date: 2010-05-19
山东格新精工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the luminescent color of the above-mentioned red phosphor is pure, there are also the following insurmountable shortcomings: YVO 4 :Eu 3+ The excitation broadband only extends to 350nm, and the absorption in the region with a wavelength greater than 350nm is very weak; Y 2 o 3 :Eu 3+ The absorption mainly occurs in the short-wave ultraviolet region below 300nm, the main excitation peak is located near 254nm, and the excitation efficiency in the near ultraviolet region (wavelength is 300nm to 410nm) is extremely low; Y 2 o 2 S:Eu 3+ The main excitation peak is located near 335nm, and the excitation broadband covers 230nm to 400nm, but the excitation intensity decreases rapidly in the region after the wavelength is greater than 350nm, and the excitation intensity is weaker after the wavelength of 400nm
These shortcomings restrict their conversion effect on near-ultraviolet light

Method used

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  • Red fluorescent powder excitated by near-ultraviolet broadband and preparation method thereof
  • Red fluorescent powder excitated by near-ultraviolet broadband and preparation method thereof
  • Red fluorescent powder excitated by near-ultraviolet broadband and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (Example 1, red fluorescent powder and preparation method thereof)

[0019] The chemical expression of the red fluorescent powder of the present embodiment is:

[0020] (Y,Gd)Cl 3 -Y 2 o 3 -3MoO 3 :0.24Eu 3+

[0021] Its preparation method is:

[0022] ① Preparation of raw material powder. Weigh 24.27g of YCl respectively 3 ·6H 2 O, 7.43 g of GdCl 3 ·6H 2 O, 19.87g of Y 2 o 3 , 4.22g of Eu 2 o 3 , 53.5g of (NH 4 ) 6 Mo 7 o 24 4H 2 O, separately ground for use (the above solid raw materials are all analytically pure, and the purity of the rare earth oxide is 99.99%).

[0023] ② Preparation of mixed materials. Mix the various raw material powders obtained in step ① evenly, then place them in an oven and dry them at 120°C for 2 hours, then cool them down to 20°C and pulverize them again.

[0024] ③ Preheating. Put the mixed material obtained in step ② into a corundum crucible and put it into a muffle furnace, preheat at a temperature of 580°C for 3 hou...

Embodiment 2～ Embodiment 18

[0028] (Example 2~Example 18, red fluorescent powder and preparation method thereof)

[0029] The chemical expressions of the red phosphors in Examples 2 to 18 are shown in Table 1, respectively. Their preparation method is basically the same as that of Example 1, and the differences are shown in Table 1.

[0030] Table 1

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

Embodiment 19～ Embodiment 24

[0037] (Example 19-Example 24, red fluorescent powder and preparation method thereof)

[0038] The chemical expressions of the red phosphors in Examples 19 to 24 are shown in Table 2, respectively. Their preparation method is basically the same as that of Example 1, except that: before the mixing in step ②, a certain mass of additives listed in Table 2 is weighed and finely ground, and then mixed evenly with the raw materials. See Table 2 for other differences.

[0039] Table 2

[0040]

[0041]

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Abstract

The invention discloses red fluorescent powder excitated by near-ultraviolet broadband and a preparation method thereof. The chemical expression of the red fluorescent powder is R1R23-R32O3-3R4O3:xEu3+, wherein R1 is one, two or more of Y3+, La3+, Gd3+, Pr3+, Sm3+ and Bi3+, and R2 is one, two or three of Cl-, Br- and I-; R3 is one, two or more of La3+, Gd3+, Y3+, Pr3+, Sm3+, Bi3+, Tm3+ and Dy3+; R4 is W6+ or/and Mo6+; and x is equal to 0.005-2.0. The preparation process comprises the steps of preparing a raw material of powder, preparing a mixture material, prefiring, sintering and postprocessing. The red fluorescent powder presents broadband excitation and sharp peak transmission to near-ultraviolet light, and red has high luminescence intensity and good color purity.

Description

technical field [0001] The invention relates to a red fluorescent powder and a preparation method thereof, in particular to a red fluorescent powder excited by near-ultraviolet broadband and a preparation method thereof. Background technique [0002] Red phosphor is a powder substance that can convert short-wavelength ultraviolet light or visible light irradiated on its surface into long-wavelength red light. It is also commonly called red light-converting powder. From the perspective of composition, red phosphor is a substance obtained by introducing a certain amount of rare earth elements or transition metal ions (called activators) into the matrix material and sintering at high temperature. Usually, the activators used in red phosphors are europium ions (Eu 3+ ), divalent europium ions (Eu 2+ ), cerium ion (Ce 3+ ) and other rare earth ions and tetravalent manganese ions (Mn 4+ ) and other transition metal ions. From the characteristics of their fluorescence spectra,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
Inventor 贺香红张华伟雷琴
Owner 山东格新精工有限公司
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