Long-afterglow fluorescent powder applied to LED and preparation method of long-afterglow fluorescent powder

A long afterglow phosphor and wavelength technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem that yellow powder does not have long afterglow characteristics, and achieve the effects of stable and reliable product quality, compensation for light loss, and long afterglow time.

Active Publication Date: 2018-07-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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Problems solved by technology

But YAG:Ce 3+ Yellow powder does not have long afterglow characteristics
At present, phosphors with long afterglow characteristics can only be effectively excited by ultraviolet light, such as SrSi 2 o 2 N 2 :Eu 2+ ,Mn 2+ Green powder (see literature Yeh, C.et al, "Appropriate green phosphor of SrSi 2 o 2 N 2 :Eu 2+ ,Mn 2+ for ACLEDs, Opt.Express, 2012, 20, 18031-18034.") and SrAl 2 o 4 :Eu 2+ , R 3+ Green powder (see literature Chen, L. et al, The green phosphor SrAl 2 o 4 :Eu 2+ , R 3+ (R=Y, Dy) and its application in alternating current light-emitting diodes, Funct. Mater. Lett., 2013, 6, 1350047.)

Method used

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[0044] The invention also provides a preparation method of the long afterglow phosphor applied to LED. The preparation method comprises the following steps:

[0045] S1, providing raw materials and grinding and mixing to obtain a mixture;

[0046] S2, in an oxygen atmosphere, sintering the mixture for the first time to obtain a first sintered body, and grinding the first sintered body into a prefabricated powder;

[0047] S3, in a reducing atmosphere, sintering the prefabricated powder for a second time to obtain a second sintered body;

[0048] S4, grinding the second sintered body to obtain a long-lasting phosphor.

[0049] In step S1, according to (A 1-x B x ) m-y C y (D 1-z E. z ) 8-m o 12 The stoichiometric ratio of the reaction raw materials was weighed. Commercially available micron or nanometer raw materials with a purity of more than 99% can be used without further processing of the raw materials, which can save costs and facilitate industrialization.

[0...

Embodiment 1

[0062] The general chemical formula of the long afterglow phosphor is Gd 2.98 Ce 0.02 Al 2 Ga 3 o 12 , that is, x=0, y=0.02, z=0.4, m=3, A is Gd, C is Ce, D is Ga, and E is Al.

[0063] The preparation method of the long afterglow phosphor is as follows:

[0064] Commercially available high-purity (99%) Gd 2 o 3 、Ce 2 (CO 3 ) 3 、Al 2 o 3 , Ga 2 o 3 As the starting raw material, accurately weigh the mass of each oxide or carbonate according to the above formula, mix and grind the weighed reaction raw materials in an agate mortar to obtain a mixture.

[0065] Put the mixture into a high-purity corundum crucible, in O 2 Under the atmosphere, sintering was performed in a tube furnace at 1400° C. for 4 hours to obtain a first sintered body. After cooling down to room temperature with the furnace, the obtained first sintered body is ground to obtain a prefabricated powder.

[0066] Add the prefabricated powder to 5% H by volume fraction 2 with a volume fraction of 9...

Embodiment 2

[0069] The general chemical formula of the long afterglow phosphor is Gd 2.98 Ce 0.02 Al 2 Ga 3 o 12 , that is, x=0, y=0.02, z=0.4, m=3, A is Gd, C is Ce, D is Ga, and E is Al.

[0070] The preparation method of the long-lasting phosphor is basically the same as that of Example 1, except that the temperature for the second sintering is 1400°C.

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Abstract

The invention relates to long-afterglow fluorescent powder applied to an LED and a preparation method of the long-afterglow fluorescent powder. The general chemical formula of the long-afterglow fluorescent powder is (Al-xBx)m-yCy(D1-zEz)8-mO12, wherein A is at least one of Y, Gd, Tb and Lu; B is at least one of La and Yb; C is at least one of Ce, Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm, Ti, Cr and Mn; D is Ga; E is at least one of B, Al, In and Sc; x, y, z and m represent the mole fraction of the corresponding elements; 0</=x</=0.2, 0.0001</=y</=0.2, 0</=z</=0.8, and 2.5</=m</=3.5. The preparation method adopts a two-step sintering process which uses oxidization atmosphere first and then uses reduction atmosphere to obtain the long-afterglow fluorescent powder which can be effectively excited by blue light and high in luminous intensity. The long-afterglow fluorescent powder can satisfy the application requirements of the direct current/alternating current LED, has an actual application valueand is promising in commercial prospect.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a long-lasting phosphor applied to LEDs and a preparation method thereof. Background technique [0002] With the advancement of light emitting diode (Light Emitting Diode, LED) technology, white light LED has gradually entered the field of general lighting from the application field of special light source. White LED is considered as the fourth-generation lighting source after incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps due to its high brightness, high color rendering index, energy saving, environmental protection, long life, small size, and high reliability. [0003] The price of high-performance white LED lamps is relatively high, which is mainly caused by two factors. On the one hand, existing white LED products mainly rely on direct current to drive, which means that additional electronic components are required. Through the current / volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7774
Inventor 刘永福乔建伟刘普蒋俊江浩川
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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