White light phosphor taking titanate as single substrate and preparation method of white light phosphor

Abstract

The invention discloses a white light phosphor taking titanate as a single substrate and a preparation method of the white light phosphor. The chemical general formula of the white light phosphor is NaA<1-x>TiO4:xDy, wherein A is La<3+> or Y<3+>, and x is greater than or equal to 0.001 and less than or equal to 0.20. The preparation method is strong in operability, simple in preparation process and low in cost; the prepared white light phosphor has the advantages that the chemical property is stable, the luminescent property is excellent, the luminescent intensity is high, the color rendering property is good, and the better light intensity and color rendering property of the white light phosphor are still kept at higher temperature, so that the white light phosphor can satisfy the application requirements of the field of white light LED illumination; the white light phosphor prepared through the preparation method is suitable for UV excitation and near UV excitation, and the emission peaks are in the positions of 488nm and 580 nm respectively; the color coordinate is positioned in the white light area (x=0.325, y=0.346), which is close to the color coordinate (x=0.33, y=0.33) of the pure white light, determined by the International Commission on Illumination.

Description

technical field

[0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a white light phosphor with titanate as a single matrix and a preparation method thereof. Background technique

[0002] As a new generation of solid-state lighting devices, Light Emitting Diode (LED) has the advantages of high efficiency, long life, small size, fast response, energy saving, and no pollution. It is currently widely used in display, lighting and other fields. At present, there are three main ways to realize white LED for lighting:

[0003] 1. Synthesis of white light by blue LED and yellow phosphor (YAG): InGaN blue chip combined with yellow phosphor YAG (yttrium aluminum garnet) to obtain white LED light source.

[0004] 2. Ultraviolet LEDs excite red, green, and blue phosphors to synthesize white light: the high-brightness near-ultraviolet LEDs are coated with three-color phosphors that can be effectively excited by ultraviol...

Examples

preparation example Construction

[0026] The preparation method of the above-mentioned white light phosphor with titanate as a single matrix comprises the following steps:

[0027] (1) Press NaA 1-x TiO 4 : the stoichiometric ratio of Na, A, Ti, and Dy elements in xDy, the solid compound containing Na element, the solid compound containing A element, the solid compound containing Ti element, the solid compound containing Dy element and flux are mixed, and the Grind and mix evenly to obtain a mixture;

[0028] (2) Put the mixture into a corundum crucible, put the corundum crucible into a high-temperature electric furnace, and calcine it in an air atmosphere to obtain a calcined product;

[0029] (3) Grinding, grinding, sieving, washing and drying the calcined product to obtain NaA 1-x TiO 4 : xDy white phosphor.

[0030] The solid compound containing Na element in the above step (1) is Na 2 CO 3 , the solid compound containing A element is La 2 o 3 or Y 2 o 3 , the solid compound containing Ti elemen...

Embodiment 1

[0038] A white light phosphor with titanate as a single matrix, the chemical formula is NaLa 0.995 Dy 0.005 TiO 4 .

[0039] The preparation method of the above-mentioned white light phosphor with titanate as a single matrix comprises the following steps:

[0040] (1) Na 2 CO 3 , La 2 o 3 、Dy 2 o 3 、TiO 2 According to the amount ratio of Na:La:Dy:Ti=1.3:0.995:0.005:1, grind in an agate mortar for 50 minutes and mix well to obtain a mixture. Among them, 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 CO3 Account for the Na involved in the reaction 2 CO 3 30% of the amount of substance.

[0041] (2) Put the mixture into a corundum crucible, put the corundum crucible into a high-temperature electric furnace, raise the temperature from room temperature to 1050 °C at a rate of 10 °C / min in an air atmosphere, keep it warm for 3 hours, and then cool to room temperature with the furnace , to o...

Embodiment 2

[0044] A white light phosphor with titanate as a single matrix, the chemical formula is NaLa 0.98 Dy 0.02 TiO 4 .

[0045] The preparation method of the above-mentioned white light phosphor with titanate as a single matrix comprises the following steps:

[0046] (1) Na 2 CO 3 , La 2 o 3 、Dy 2 o 3 、TiO 2 According to the amount ratio of Na:La:Dy:Ti=1.4:0.98:0.02:1, grind in an agate mortar for 40 minutes and mix well to obtain a mixture. Among them, 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 Account for the Na involved in the reaction 2 CO 3 40% of the amount of substance.

[0047] (2) Put the mixture into a corundum crucible, put the corundum crucible into a high-temperature electric furnace, raise the temperature from room temperature to 900 °C at a rate of 10 °C / min in an air atmosphere, keep it warm for 6 hours, and then cool to room temperature with the furnace , to obta...

technical field

[0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a white light phosphor with titanate as a single matrix and a preparation method thereof. Background technique

[0002] As a new generation of solid-state lighting devices, Light Emitting Diode (LED) has the advantages of high efficiency, long life, small size, fast response, energy saving, and no pollution. It is currently widely used in display, lighting and other fields. At present, there are three main ways to realize white LED for lighting:

[0003] 1. Synthesis of white light by blue LED and yellow phosphor (YAG): InGaN blue chip combined with yellow phosphor YAG (yttrium aluminum garnet) to obtain white LED light source.

[0004] 2. Ultraviolet LEDs excite red, green, and blue phosphors to synthesize white light: the high-brightness near-ultraviolet LEDs are coated with three-color phosphors that can be effectively excited by ultraviol...

Examples

preparation example Construction

[0026] The preparation method of the above-mentioned white light phosphor with titanate as a single matrix comprises the following steps:

[0027] (1) Press NaA 1-x TiO 4 : the stoichiometric ratio of Na, A, Ti, and Dy elements in xDy, the solid compound containing Na element, the solid compound containing A element, the solid compound containing Ti element, the solid compound containing Dy element and flux are mixed, and the Grind and mix evenly to obtain a mixture;

[0028] (2) Put the mixture into a corundum crucible, put the corundum crucible into a high-temperature electric furnace, and calcine it in an air atmosphere to obtain a calcined product;

[0029] (3) Grinding, grinding, sieving, washing and drying the calcined product to obtain NaA 1-x TiO 4 : xDy white phosphor.

[0030] The solid compound containing Na element in the above step (1) is Na 2 CO 3 , the solid compound containing A element is La 2 o 3 or Y 2 o 3 , the solid compound containing Ti elemen...

Embodiment 1

[0038] A white light phosphor with titanate as a single matrix, the chemical formula is NaLa 0.995 Dy 0.005 TiO 4 .

[0039] The preparation method of the above-mentioned white light phosphor with titanate as a single matrix comprises the following steps:

[0040] (1) Na 2 CO 3 , La 2 o 3 、Dy 2 o 3 、TiO 2 According to the amount ratio of Na:La:Dy:Ti=1.3:0.995:0.005:1, grind in an agate mortar for 50 minutes and mix well to obtain a mixture. Among them, 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 CO3 Account for the Na involved in the reaction 2 CO 3 30% of the amount of substance.

[0041] (2) Put the mixture into a corundum crucible, put the corundum crucible into a high-temperature electric furnace, raise the temperature from room temperature to 1050 °C at a rate of 10 °C / min in an air atmosphere, keep it warm for 3 hours, and then cool to room temperature with the furnace , to o...

Embodiment 2

[0044] A white light phosphor with titanate as a single matrix, the chemical formula is NaLa 0.98 Dy 0.02 TiO 4 .

[0045] The preparation method of the above-mentioned white light phosphor with titanate as a single matrix comprises the following steps:

[0046] (1) Na 2 CO 3 , La 2 o 3 、Dy 2 o 3 、TiO 2 According to the amount ratio of Na:La:Dy:Ti=1.4:0.98:0.02:1, grind in an agate mortar for 40 minutes and mix well to obtain a mixture. Among them, 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 Account for the Na involved in the reaction 2 CO 3 40% of the amount of substance.

[0047] (2) Put the mixture into a corundum crucible, put the corundum crucible into a high-temperature electric furnace, raise the temperature from room temperature to 900 °C at a rate of 10 °C / min in an air atmosphere, keep it warm for 6 hours, and then cool to room temperature with the furnace , to obta...

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