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High-brightness borate-based green fluorescent powder for white light-emitting diode (LED) and high-temperature reduction preparation method thereof

A green phosphor, borate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as unsatisfactory luminous efficiency, and achieve the effect of stable performance and good luminous performance

Inactive Publication Date: 2012-02-15
FUSHUN OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, white LEDs of ultraviolet and near-ultraviolet systems have the advantages of lower cost, easier color control than blue LEDs, excellent color uniformity, and good color rendering; however, traditional tricolor phosphors are used in near-ultraviolet white LEDs. The luminous efficiency in the system is not ideal, so it is necessary to develop new tricolor phosphors for near-ultraviolet LED chips

Method used

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  • High-brightness borate-based green fluorescent powder for white light-emitting diode (LED) and high-temperature reduction preparation method thereof
  • High-brightness borate-based green fluorescent powder for white light-emitting diode (LED) and high-temperature reduction preparation method thereof
  • High-brightness borate-based green fluorescent powder for white light-emitting diode (LED) and high-temperature reduction preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Molecular formula: Na 3 La 2-x-y Ce x Tb y (BO 3 ) 3 (In the formula, y=0; x respectively take 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.50, 9 numerical values ​​to test, the test method is as follows)

[0022] ①According to the molecular formula, weigh a certain weight of the reagent according to the stoichiometric ratio: the types of reagents are H 3 BO 3 (purity is 99.5%), La 2 o 3 (99.99% pure), CeO 2 (purity is 99.9%), Na 2 CO 3 (purity is 99.0%), where H 3 BO 3 The weighed mass was in excess of 5% of the stoichiometric amount. For example: when x takes a value of 0.10, then Na 2 CO 3 (99.0% purity) 1.5 moles, La 2 o 3 (purity is 99.99%) have (2-0.1) / 2=1.9 / 2 mole, H 3 BO 3 (purity is 99.5%) there are 3 moles and an excess of 5%, CeO 2 (purity is 99.9%) has 0.1 mole, similarly when x takes other values ​​in 0.05, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.50, the corresponding compound H 3 BO 3 (purity is 99.5%), La 2 o 3 (99.99% pure), Ce...

Embodiment 2

[0030] Molecular formula: Na 3 La 2-x-y Ce x Tb y (BO 3 ) 3 (x=0.30; y respectively take 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 8 values ​​for the test, the test method is as follows)

[0031] ①According to the molecular formula, weigh a certain weight of reagent according to the stoichiometric ratio: the types of reagents are H 3 BO 3 (purity is 99.5%), La 2 o 3 (99.99% pure), Tb 4 o 7 (99.9% pure), CeO 2 (purity is 99.9%), Na 2 CO 3 (purity is 99.0%); as: when x takes 0.30, y takes 0.10 value, then Na 2 CO 3 (99.0% purity) 1.5 moles, La 2 o 3 (purity is 99.99%) have (2-0.4) / 2=0.8 mol, H 3 BO 3 (purity is 99.5%) there are 3 moles and an excess of 5%, CeO 2 (purity of 99.9%) has 0.3 moles; Tb 4 o 7 (purity is 99.9%) has 0.1 mole; Similarly when y takes other values ​​in 0.05,0.15,0.20,0.25,0.30,0.35,0.40, the corresponding compound H 3 BO 3 (purity is 99.5%), La 2 o 3 (99.99% pure), CeO 2 (purity is 99.9%), Na 2 CO 3 (purity is 99.0%), also...

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Abstract

The invention discloses high-brightness borate-based green fluorescent powder for a white light-emitting diode (LED) and a high-temperature reduction preparation method thereof, and belongs to a preparation technology for the green fluorescent powder applied in the fields of white LEDs, mobile display equipment background lamps, light-storing materials and the like. A series of borate green fluorescent powder coactivated by Ce<3+>-Tb<3+> is prepared by a high-temperature solid phase reduction method, wherein the structural formula is Na3La2-x-yCexTby(BO3)3 (x is more than 0 and less than or equal to 0.5 and y is more than 0 and less than or equal to 0.4). The fluorophor can be effectively activated by near ultraviolet light (335nm) to emit green light, wherein the main emission peak value is 543 nm. In the process of preparing the products by the high-temperature solid phase method, the green fluorescent powder for the white LED is prepared by adding 5 mass percent of excessive H3BO3 in a stoichiometric ratio and performing ultrasonic aftertreatment.

Description

technical field [0001] The invention relates to a borate green fluorescent powder and a preparation method thereof. It belongs to the preparation technology of green fluorescent powder used in the fields of white light LED, mobile display equipment background light, light storage type materials and the like. Background technique [0002] In order for white LEDs to completely replace fluorescent lamps as a new generation of indoor lighting sources, in addition to cost reduction, the product also needs to have higher lumen efficiency, higher color rendering index, and better adjustability of the color temperature of white light emission. Due to the combination of "blue LED + yellow phosphor" into a white light system, there are inherent problems, such as: the electro-optic intensity of the blue light spectrum increases faster than that of long-wavelength light, that is, yellow light, at high currents. As the current changes, it will cause The mismatch of the spectrum can easi...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
Inventor 谢安刘丽杨伟艺张志鹏何仲全
Owner FUSHUN OPTOELECTRONICS TECH
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