Near-UV excited single matrix white phosphor and preparation method thereof

A technology of near-ultraviolet light and fluorescent powder, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of device lumen efficiency and color restoration, and achieve stable color development, good color restoration, and high lumen efficiency. Effect

Inactive Publication Date: 2015-08-05
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problems of color reabsorption and ratio control among the three mixed phosphors, the lumen efficiency and color reproduction of the device are greatly affected.

Method used

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  • Near-UV excited single matrix white phosphor and preparation method thereof
  • Near-UV excited single matrix white phosphor and preparation method thereof
  • Near-UV excited single matrix white phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the value range of phosphor powder x and y, take x=0.15, y=0.05, then the chemical composition of phosphor powder is Ca 2 Y 2.4 Sb 3 o 14 :0.15Bi 3+ ,0.05Eu 3+ . According to this chemical composition, the proportioning ratio of each raw material is calculated as shown in Table 1.

[0039] Table 1: Ca 2 Y 2.4 Sb 3 o 14 :0.15Bi 3+ ,0.05Eu 3+ Raw material ratio of phosphor powder

[0040] raw material

quality

CaCO 3

2.022 grams

Y 2 o 3

2.709 grams

Sb 2 o 3

4.417 grams

Bi 2 o 3

1.048 grams

Eu 2 o 3

0.264 grams

h 3 BO 3

0.3 grams

[0041] Accurately weigh the above raw materials, grind them carefully in an agate mortar, and put them into a small alumina crucible. Calcined at 1350° C. for 8 hours, cooled naturally to room temperature, taken out, and crushed and ground the resultant to obtain the white phosphor material in Example 1.

[0042]...

Embodiment 2

[0046] According to the value range of phosphor powder x and y, x=0.15, y=0.02, then the chemical composition of phosphor powder is Ca 2 Y 2.49 Sb 3 o 14 :0.15Bi 3+ ,0.02Eu 3+ . According to this chemical composition, calculate the proportioning ratio of each raw material as shown in Table 2.

[0047] Table 2: Ca 2 Y 2.4 Sb 3 o 14 :0.15Bi 3+ ,0.02Eu 3+ Raw material ratio of phosphor powder

[0048] raw material

quality

CaCO 3

2.022 grams

Y 2 o 3

2.811 grams

Sb 2 o 3

4.417 grams

Bi 2 o 3

1.048 grams

Eu 2 o 3

0.105 grams

h 3 BO 3

0.3 grams

[0049] Accurately weigh the above raw materials, grind them carefully in an agate mortar, and put them into a small alumina crucible. Calcined at 1400°C for 6 hours, cooled naturally to room temperature, taken out, crushed and ground the resultant to obtain the example material.

[0050] Such as Figure 4 Shown, the X-r...

Embodiment 3

[0054] According to the value range of phosphor powder x and y, take x=0.15, y=0.03, then the chemical composition of phosphor powder is Ca 2 Y 2.52 Sb 3 o 14 :0.15Bi 3+ ,0.03Eu 3+ . According to this chemical composition, the proportioning ratio of each raw material is calculated as shown in Table 3.

[0055] Table 3: Ca 2 Y 2.52 Sb 3 o 14 :0.15Bi 3+ ,0.03Eu 3+ Raw material ratio of phosphor powder

[0056] raw material

weight

CaCO 3

2.022 grams

Y 2 o 3

2.777 grams

Sb 2 o 3

4.417 grams

Bi 2 o 3

1.048 grams

Eu 2 o 3

0.158 grams

h 3 BO 3

0.3 grams

[0057] Accurately weigh the above raw materials, grind them carefully in an agate mortar, and put them into a small alumina crucible. Calcined at 1500°C for 4 hours, cooled naturally to room temperature, taken out, and the resultant was crushed and ground to obtain the example material.

[0058] Such as Figure...

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Abstract

The invention discloses a near-UV excited single matrix white phosphor and its preparation method. Bi<3+> ion is initiatively used as a blue light activator. Bi<3+> is doped into a matrix to emit blue light in near-UV light. A matrix Ca2Y3Sb3O14 is simultaneously doped with Bi<3+> and Eu<3+>. Under near-UV excitation, blue light emitted from Bi<3+> and orange light emitted from Eu<3+> are combined to obtain white light. The near-UV excited single matrix white phosphor is prepared at a non-reducing atmosphere by a high-temperature solid phase method. The main method comprises the following steps: weighing raw materials according to stoichiometric ratio of chemical composition of the phosphor, adding a cosolvent, mixing, fully grinding, calcining at high temperature of 1300-1500 DEG C for 3-8 h; cooling the above product to room temperature, and grinding to obtain the white phosphor. A white-light LED device is obtained by coating a near-UV LED chip with the phosphor. The white light has stable color development. Color reductibility is good. The technology is simple and has high luminous efficiency.

Description

technical field [0001] The invention belongs to the field of inorganic photoluminescent materials, and in particular relates to a single-matrix fluorescent powder capable of emitting white light under near-ultraviolet light excitation and a preparation method thereof. Background technique [0002] White light LED is widely used in the field of lighting and display because of its many advantages such as energy saving, environmental protection, small size, long life, fast response speed, all solid state, shock resistance and good safety performance. [0003] At present, there are two main ways to realize commercial white LED devices: one is to coat the GaInN blue chip with Y 3 Al 5 o 12 : Ce 3+ The representative yellow phosphor uses the yellow light of the phosphor and the blue light of the chip to form white light. The luminescent color of this device changes with the thickness of the phosphor powder and the change of the driving current. The color reproduction and color...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 蒋自强孙志华苏兴华于晓晨段尧
Owner CHANGAN UNIV
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