Titanate red fluorescent powder suitable for applying to white-light LED and preparation method thereof

A technology of red fluorescent powder and titanate, which is applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve problems such as poor stability, low luminous efficiency, and easy aging, and achieve high temperature stability and excellent preparation process Simple, operable effects

Active Publication Date: 2015-02-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But red phosphor Y 2 o 2 S: Eu 3+ There are problems such as low luminous efficiency, poor stability, and easy aging, and the absorption of near-ultraviolet light is limited, and its luminous intensity is only one-eighth of the brightness of blue phosphors and green phosphors.
The lack of efficient and stable red phosphor restricts the further development of white LED performance

Method used

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  • Titanate red fluorescent powder suitable for applying to white-light LED and preparation method thereof
  • Titanate red fluorescent powder suitable for applying to white-light LED and preparation method thereof
  • Titanate red fluorescent powder suitable for applying to white-light LED and preparation method thereof

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preparation example Construction

[0024] The above-mentioned preparation method of titanate red phosphor suitable for white light LED application includes the following steps:

[0025] (1) According to the general chemical formula NaA 1-x TiO 4 : The stoichiometric ratio in xSm, mixing the solid compound containing Na element, the solid compound containing element A, the solid compound containing Ti element, the solid compound containing Sm element, and the flux, and then grinding and mixing uniformly to obtain a mixture;

[0026] (2) Put the mixture into a crucible, then put the crucible into a high-temperature electric furnace, and calcinate in an air atmosphere to obtain a calcined product;

[0027] (3) The calcined material is crushed, ground, sieved, washed and dried to obtain NaA 1-x TiO 4 : XSm red phosphor.

[0028] The solid compound containing Na in the above step (1) is Na 2 CO 3 , The solid compound containing Ti element is TiO 2 , The solid compound containing Eu element is Eu 2 O 3 , The solid compound co...

Embodiment 1

[0036] A titanate red phosphor suitable for white light LED applications, its chemical formula is NaLa 0.995 Sm 0.005 TiO 4 .

[0037] The above-mentioned preparation method of titanate red phosphor suitable for white light LED application includes the following steps:

[0038] (1) Put Na 2 CO 3 , La 2 O 3 , Sm 2 O 3 , TiO 2 According to the material ratio of Na:La:Sm:Ti=1.3:0.995:0.005:1, grind it in an agate mortar and mix it thoroughly to obtain a mixture; where Na 2 CO 3 It not only participates in the reaction as a reactant, but also acts as a fluxing agent. As a fluxing agent, Na 2 CO 3 Accounted for Na participating in the reaction 2 CO 3 30% of the amount of the substance;

[0039] (2) Put the mixture into a corundum crucible, and then put the corundum crucible into a high-temperature electric furnace. In an air atmosphere, it will rise from room temperature to 950°C at a heating rate of 10°C / min, keep it for 4 hours, and then cool to room temperature with the furnace , Get t...

Embodiment 2

[0043] A titanate red phosphor suitable for white light LED applications, its chemical formula is NaLa 0.98 Sm 0.02 TiO 4 .

[0044] The above-mentioned preparation method of titanate red phosphor suitable for white light LED application includes the following steps:

[0045] (1) Put Na 2 CO 3 , La 2 O 3 , Sm 2 O 3 , TiO 2 According to the material ratio of Na:La:Sm:Ti=1.4:0.98:0.02:1, grind it in an agate mortar and mix well to obtain a mixture; wherein, Na 2 CO 3 It not only participates in the reaction as a reactant, but also acts as a fluxing agent. As a fluxing agent, Na 2 CO 3 Accounted for Na participating in the reaction 2 CO 3 40% of the amount of the substance;

[0046] (2) Put the mixture into a corundum crucible, and then put the corundum crucible into a high-temperature electric furnace. In an air atmosphere, the temperature rises from room temperature to 900°C at a heating rate of 10°C / min, keeps it for 6 hours, and then cools to room temperature with the furnace , Get ...

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Abstract

The invention discloses a titanate red fluorescent powder suitable for applying to a white-light LED and a preparation method thereof. The titanate based fluorescent powder has a general chemical formula NaAl-xTiO4:xSm, where A is La<3+> or Y<3+>, x is larger than or equal to 0.001, but less than or equal to 0.10. The method provided by the invention has strong maneuverability, is simple in preparation process, and is suitable for large scale industrialized production. The prepared fluorescent powder takes trivalent Sm ions Sm<3+> as active ions and NaLaTiO4 or NaYTiO4 as base, can be effectively stimulated by 390-410 nm ultraviolet light or 460-490 nm blue ray, is suitable for stimulation of excitation light sources including ultraviolet, near ultraviolet or blue ray, and is high in light efficiency and good in high temperature stability. Moreover, red light of 560-670 nm wave length can be emitted. Therefore, the fluorescent powder which is good in performance is suitable for applying to the white-light LED.

Description

Technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and particularly relates to a titanate red phosphor suitable for white light LED applications and a preparation method thereof. Background technique [0002] White LED is a high-efficiency, energy-saving, environmentally friendly and green lighting source, which is widely used in various lighting and display fields. [0003] Currently, the commercially available red phosphor is Y 2 O 2 S: Eu 3+ . But the red phosphor Y 2 O 2 S: Eu 3+ There are problems such as low luminous efficiency, poor stability, and easy aging, and the absorption of near-ultraviolet light is limited, and its luminous intensity is only one-eighth of the brightness of blue phosphors and green phosphors. The lack of efficient and stable red phosphors restricts the further development of white LED performance. [0004] At present, rare earth elements doped with luminescent materials are mainly concentrated on C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
CPCY02B20/00
Inventor 武秀兰张晋春任强朱建锋杨元东陈娟妮
Owner SHAANXI UNIV OF SCI & TECH
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