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Mn<4+> activated double perovskite red fluorescent powder for white LED (Light-Emitting Diode) and preparation method

A technology of red phosphor and double perovskite, which is applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as low lumen efficiency, low environmental tolerance, and unstable red light emission, achieving High lumen efficiency, environmental friendliness, stable color effect

Inactive Publication Date: 2018-07-06
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a Mn 4+ Activated double perovskite red phosphor powder for white light LED and its preparation method solve the technical problems of unstable red light emission, low lumen efficiency and low environmental tolerance of red phosphor powder used in white light LED in the prior art

Method used

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  • Mn&lt;4+&gt; activated double perovskite red fluorescent powder for white LED (Light-Emitting Diode) and preparation method
  • Mn&lt;4+&gt; activated double perovskite red fluorescent powder for white LED (Light-Emitting Diode) and preparation method
  • Mn&lt;4+&gt; activated double perovskite red fluorescent powder for white LED (Light-Emitting Diode) and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a kind of Mn 4+ Activated double perovskite red phosphors for white LEDs with the chemical formula Y 2 MgTi 1-x o 6 :xMn 4+ Wherein, x=0.0005, then the chemical formula of the red phosphor is Y 2 MgTi 0.9995 o 6 : 0.0005Mn 4+ . According to this composition, the proportioning ratio of each raw material is calculated as shown in Table 1.

[0034] Table 1Y 2 MgTi 0.9995 o 6 : 0.0005Mn 4+ Raw material ratio of phosphor powder

[0035] raw material

quality

Y(NO 3 ) 3 .6H 2 o

7.6416 grams

Mg(NO 3 ) 2 .6H 2 o

2.5642 grams

C 16 h 36 OTi

3.4018 grams

Mn(CH 3 COO) 2 .4H 2 o

0.0012 grams

C 6 h 8 o 7

7.2 grams

[0036] Mn in this example 4+ The specific process of the preparation method of the double perovskite red phosphor powder for activated white light LEDs is: according to the raw material ratio given in Table 1, accurately weigh Y(NO 3 ...

Embodiment 2

[0044] This embodiment provides a kind of Mn 4+ Activated double perovskite red phosphors for white LEDs with the chemical formula Y 2 MgTi 1-x o 6 :xMn 4+ Wherein, x=0.001, then the chemical formula of the red phosphor is Y 2 MgTi 0.999 o 6 : 0.001Mn 4+ . According to this composition, the proportioning ratio of each raw material is calculated as shown in Table 2.

[0045] Form 2Y 2 MgTi 0.999 o 6 : 0.001Mn 4+ Raw material ratio of phosphor powder

[0046] raw material

quality

Y 2 o 3

2.2524 grams

MgO

0.4000 grams

C 16 h 36 OTi

3.4001 grams

MnCO 3

0.0011 grams

C 6 h 8 o 7

7.2 grams

[0047] Mn in this example 4+ The specific process of the preparation method of the double perovskite red phosphor powder for the activated white light LED is as follows:

[0048] Accurately weigh Y according to the ratio of raw materials given in Table 2 2 o 3 , MgO, MnCO 3 Put it in a small...

Embodiment 3

[0051] This embodiment provides a kind of Mn 4+ Activated double perovskite red phosphors for white LEDs with the chemical formula Y 2 MgTi 1-x o 6 :xMn 4+ Wherein, x=0.002, then the chemical formula of the red phosphor is Y 2 MgTi 0.998 o 6 : 0.002Mn 4+ . According to this composition, the proportioning ratio of each raw material is calculated as shown in Table 3.

[0052] Table 3Y 2 MgTi 0.998 o 6 : 0.002Mn 4+ Raw material ratio of phosphor powder

[0053] raw material

[0054] Mn in this example 4+ The specific process of the preparation method of the double perovskite red phosphor powder for activated white light LEDs is: according to the raw material ratio given in Table 3, accurately weigh YCl 3 , MgCl 2 .,MnCl 2 , and C 6 h 8 o 7 , add 20ml of deionized water, stir to dissolve, and obtain A solution. Accurately weigh C. 16 h 36 OTi was dissolved in 20ml of ethylene glycol to obtain solution B. Under the condition of 90°C and constant sti...

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Abstract

The invention provides Mn<4+> activated double perovskite red fluorescent powder for white LED (Light-Emitting Diode) and a preparation method. The chemical formula of the red fluorescent powder is Y2MgTi1-xO6:xMn<4+>, wherein x is the doping concentration of an activator Mn<4+>, and is larger than or equal 0.0005 and is less than or equal to 0.02. The method is characterized in that: a sol-gel method is used for synthesizing, raw materials are selected from soluble yttrium-containing compound, magnesium-containing compound, manganese-containing compound, tetrabutyl titanate, ethanol or ethylene glycol and citric acid. The preparation method is characterized in that quadrivalent magnesium ions are taken as activator, yttrium magnesium titanate being of a double-perovskite structure is taken as a substrate material for preparing red fluorescent powder Y2MgTi1-xO6:xMn<4+> (x is larger than or equal to 0.0005 and is less than or equal to 0.02); the emitted red light is stable in light, and has the high luminous efficiency and superior wet resistance thermal resistance.

Description

technical field [0001] The field of inorganic photoluminescent materials of the present invention relates to red fluorescent powder for white light LEDs, in particular to a kind of Mn 4+ Double perovskite red phosphor powder for activated white light LED and its preparation method. 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 reprodu...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7701H01L33/502Y02B20/00
Inventor 蒋自强罗伟华于晓晨丛培良段理陈茂海董赟朱鑫维郭常娟
Owner CHANGAN UNIV
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