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Vanadate luminescent material and preparation method thereof

A technology of luminescent materials and vanadate, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of unstable white light emission, weak emission in the red light band, and easy deliquescence of luminescent materials, and achieve enhanced luminous intensity and equipment requirements Low, easily controlled effects

Active Publication Date: 2018-01-19
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the white light LEDs made by the above methods all have problems such as unstable white light emission and too weak emission in the red light band, resulting in low color rendering.
[0003] Currently widely used red-emitting fluorescent materials are mainly sulfide or nitride systems, but such as Y 2 o 2 S:Eu 3+ , CaS:Eu 2+ The luminescent materials of the sulfide system are easy to deliquescence, and are easily affected by the environment, and have poor chemical stability; while the luminescent materials of the nitride system (such as CaAlSiN 3 :Eu 2+ ) has high conversion efficiency and good thermal stability, but its synthesis conditions are harsh and the production cost is high

Method used

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  • Vanadate luminescent material and preparation method thereof
  • Vanadate luminescent material and preparation method thereof
  • Vanadate luminescent material and preparation method thereof

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Embodiment 1

[0035] The composition of the vanadate luminescent material in this embodiment is Sr 3 Lu 1-x (VO 4 ) 3 :xEu 3+ , wherein, x is respectively 0, 0.007, 0.009, 0.02, 0.04, 0.06 (the sample numbers are 1-6 respectively), and the component formula of each sample is shown in Table 1 below.

[0036] The corresponding raw materials and quality (g) of each sample in Table 1

[0037]

[0038] *Note: Sample 1 in Table 1 is the control group, which is not doped with Eu 3+ Sr and Lu vanadates.

[0039] Prepare samples 1-6 according to the formula dosage of each sample in Table 1, the process is as follows: weigh a certain amount of strontium carbonate SrCO 3 , Lanthanum oxide Lu 2 o 3 , europium oxide Eu 2 o 3 and ammonium metavanadate NH 4 VO 3 , after grinding in an agate mortar and mixing evenly, put the obtained grinding mixture into a corundum crucible, and place it in a muffle furnace, and select an air atmosphere for sintering. Burn for 6 hours, then heat up to 900°...

Embodiment 2

[0054] The composition of the vanadate luminescent material in this embodiment is Sr 3 La 0.97 (VO 4 ) 3 :0.03Eu 3+ , and its preparation process is as follows: According to the general chemical formula Sr 3 La0.97 (VO 4 ) 3 :0.03Eu 3+ , respectively weigh a certain amount of strontium oxide SrO, lanthanum oxide La 2 o 3 , europium oxide Eu 2 o 3 and vanadium pentoxide V 2 o 5 , after being ground in an agate mortar and mixed evenly, the obtained grinding mixture is put into a corundum crucible and placed in a muffle furnace, and the air atmosphere is selected for sintering. Burn for 4 hours, then heat up to 800°C and calcined for 10 hours, then cool to room temperature with the furnace, take out the sample and grind it into powder, and the general chemical formula is Sr 3 La 0.97 (VO 4 ) 3 :0.03Eu 3+ vanadate luminescent material.

Embodiment 3

[0056] The composition of the vanadate luminescent material in this embodiment is Ca 3 Y 0.95 (VO 4 ) 3 :0.05Eu 3+ , the preparation process is as follows: Weigh a certain amount of calcium carbonate CaCO 3 , Y 2 o 3 , europium acetate (CAS No.62667-64-5) and ammonium metavanadate NH 4 VO 3 , after grinding and mixing uniformly in an agate mortar, put the obtained grinding mixture into a corundum crucible, and place it in a muffle furnace, select an air atmosphere for sintering, wherein, the specific procedure for sintering is: first raise the temperature to 200°C Burn for 5 hours, then heat up to 850°C for 9 hours, then cool to room temperature with the furnace, take out the sample and grind it into powder, and the general chemical formula is Ca 3 Y 0.95 (VO 4 ) 3 :0.05Eu 3+ vanadate luminescent material.

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Abstract

The invention provides a vanadate luminescent material. The chemical general formula of the vanadate luminescent material is A3Ln1-x(VO4)3:xEu<3+>, wherein Eu<3+> is activated ion, A3Ln1-x(VO4)3 is matrix, the A is Ca, Ba or Sr, Ln is La, Y or Lu, x is the mole percentage of substitution of Lu atom by Eu atom, and x is greater than 0 and less than or equal to 0.06. The vanadate luminescent material provided by the invention can emit high intensity red light with good color purity. Also the material has luminescent intensity strengthened along with the rise of the environmental temperature, thermal quenching phenomenon is unlikely to occur, and the luminous efficiency is high, and the vanadate luminescent material can be used for white light LED and other luminescent fields. In addition, the invention also provides a preparation method of the vanadate luminescent material.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a vanadate luminescent material and a preparation method thereof. Background technique [0002] White light LEDs are considered to be the fourth-generation solid-state lighting sources that can replace traditional lighting because of their small size, long life, low power consumption, low heat generation, fast response, and planar packaging. At present, the production method of commercialized white light LED is the combination of "blue LED chip + yellow phosphor powder". In addition, the production method of "ultraviolet or near-ultraviolet LED chips + red, green and blue three primary colors or phosphors of multiple colors" has also begun to attract attention. However, the white light LEDs made by the above methods all have problems such as unstable white light emission and too weak emission in the red light band, resulting in low color rendering. [0003] Curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/82
Inventor 周贤菊陈凌妮罗小霞江莎李丽相国涛
Owner CHONGQING UNIV OF POSTS & TELECOMM
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