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Molybdate-based red phosphor powder for white LED and preparation method thereof

A technology of red fluorescent powder and molybdate, which is applied in the direction of chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of complex preparation process, unstable performance, high color temperature, etc., and achieve simple preparation process, low equipment requirements, The effect of low sintering temperature

Active Publication Date: 2015-08-05
徐州博创建设发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the research on white light LED is still one of the current priorities, because the current commercial white light LED products mainly use blue light LED to excite yellow phosphor YAG:Ce to form white light. The color rendering index is low and the color temperature is high, which is difficult to meet the application requirements of high-performance devices
Subsequently, with the commercial red phosphor Y 2 o 3 :Eu 3+ This phenomenon has been improved, but the red phosphor cannot effectively absorb in the near ultraviolet range, which greatly reduces the brightness of the light, so its application is still not optimistic
[0003] Existing red phosphors have insufficient luminous brightness, unstable performance, and complicated preparation process. At present, many researchers have devoted themselves to developing high-performance red phosphors to meet the technical requirements of different application goals and improve the stability and luminescence of phosphors. Performance and continuous improvement of the preparation process has become the core idea

Method used

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  • Molybdate-based red phosphor powder for white LED and preparation method thereof
  • Molybdate-based red phosphor powder for white LED and preparation method thereof
  • Molybdate-based red phosphor powder for white LED and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] Preparation of Na 1.9 Eu 0.1 Zn 2 Mo 2 o 9 , according to the chemical formula Na 1.9 Eu 0.1 Zn 2 Mo 2 o 9 The stoichiometric ratio of each element in the formula is weighed separately: sodium carbonate Na 2 CO 3 : 0.504 grams, zinc oxide ZnO: 0.814 grams, ammonium molybdate (NH 4 ) 6 m O7 o 24 .4H 2 O: 1.766 g, europium oxide Eu 2 o 3 : 0.088g. After grinding and mixing evenly in an agate mortar, the first pre-sintering is carried out in the air atmosphere of the muffle furnace. The pre-sintering temperature is 400 ° C, and the pre-sintering time is 5 hours. The second pre-sintering is carried out under the parameters; after cooling to room temperature, the sample is taken out, the mixture is fully mixed and ground evenly, and calcined in the air atmosphere, the calcination temperature is 600°C, and the calcination time is 12 hours, then the temperature is lowered to 250°C and kept warm After 6 hours, it was cooled to room temperature, and the sample ...

Embodiment 2

[0042] Preparation of Na 1.6 Eu 0.4 Zn 2 Mo 2 o 9 , according to the chemical formula Na 1.6 Eu 0.4 Zn 2 Mo 2 o 9 The stoichiometric ratio of each element in the formula is weighed separately: sodium carbonate Na 2 CO 3 : 0.424 g, zinc oxide ZnO: 0.814 g, molybdenum oxide MoO 3 : 1.44 g, europium oxide Eu 2 o 3 : 0.352 g. After grinding and mixing evenly in an agate mortar, pre-sintering is carried out in an air atmosphere in a muffle furnace. The pre-sintering temperature is 500°C, and the pre-sintering time is 1 hour. Mix and grind evenly, then calcine in the air atmosphere, the calcination temperature is 900°C, the calcination time is 1 hour, then slowly lower the temperature to 400°C and keep it warm for 2 hours, then cool to room temperature, take out the sample and grind it evenly to get powdered molybdic acid Salt-based red phosphor.

[0043] See attached Figure 6 , which is the X-ray phase diffraction spectrum of the sample prepared by the technical sc...

Embodiment 3

[0048] Preparation of NaEuZn 2 Mo 2 o 9 , according to the chemical formula NaEuZn 2 Mo 2 o 9 The stoichiometric ratio of each element in the formula is weighed separately: sodium nitrate NaNO 3 : 0.425 g, zinc nitrate Zn (NO 3 ) 2 : 2.97 g, ammonium molybdate (NH 4 ) 6 m O7 o 24 .4H 2 O: 1.766 g, europium nitrate Eu (NO 3 ) 3 : 2.22 grams, then take by weighing citric acid respectively by 0.5wt% of above each medicine quality. First dissolve the above-mentioned medicines weighed in an appropriate amount of nitric acid solution, and dilute them with 5 times its volume of deionized water. After the dissolution is complete, add the weighed citric acid to each solution, and magnetically stir for 1 hour. Until the citric acid is completely dissolved; mix the obtained solutions, continue to stir at 50°C for 2 hours, let stand and dry to obtain a fluffy precursor; place the precursor in a muffle furnace under an air atmosphere Calcination, the calcination temperature ...

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Abstract

The invention relates to molybdate-based red phosphor powder for white LED and a preparation method thereof. The molybdate-based red phosphor powder has a chemical formula of Na2-2xEu2xZn2Mo2O9, wherein x is greater than or equal to 0.001 and less than 1.0. The molybdate-based red phosphor powder utilizes novel molybdate as a base material, produces strong stimulation nearby near ultraviolet and blue light, can emit red fluorescence with a peak value at the wavelength of about 625nm, has high luminous efficiency, good heat stability, pure color, high brightness and environmental friendliness, does not produce toxic gas such as sulfides under ultraviolet radiation, is environmentally friendly and can be used in the white LED field and other luminescence fields. The preparation method has simple and flexible processes, utilizes abundant sources, has a low sintering temperature of 550-900 DEG C substantially lower than preparation temperatures (of 1200 DEG C or more) of silicate and aluminate systems, has low equipment requirements and saves energy.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a molybdate-based red fluorescent powder for white LEDs and a preparation method thereof, belonging to the technical field of inorganic luminescent materials. Background technique [0002] With the continuous development of society, corresponding technologies such as electronic equipment and devices are constantly being updated, and white light-emitting diodes (white LEDs) have been widely popularized in lighting, flat panel display, lighting decoration and other fields. But the research on white light LED is still one of the current priorities, because the current commercial white light LED products mainly use blue light LED to excite yellow phosphor YAG:Ce to form white light. The color rendering index is low and the color temperature is high, which makes it difficult to meet the application requirements of high-performance devices. Subsequently, with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68H01L33/50
CPCY02B20/00
Inventor 乔学斌
Owner 徐州博创建设发展集团有限公司
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