Method for preparing YAG-Ce fluorescent powder for white-light LED (light-emitting diode)

A fluorescent powder and white light technology, applied in the field of fluorescent powder, can solve the problems of non-environmental protection and energy consumption, and achieve the effects of reduced manufacturing costs, lower reaction temperatures, and lower energy costs

Active Publication Date: 2013-10-09
HUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Depending on the type of reaction raw materials, particle changes, and pretreatment, the reaction temperature w...

Method used

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  • Method for preparing YAG-Ce fluorescent powder for white-light LED (light-emitting diode)
  • Method for preparing YAG-Ce fluorescent powder for white-light LED (light-emitting diode)
  • Method for preparing YAG-Ce fluorescent powder for white-light LED (light-emitting diode)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First weigh the burning agent urea and the raw materials for preparing YAG-Ce phosphor: including aluminum nitrate, cerium nitrate, and yttrium oxide; the weight ratio of urea / aluminum nitrate is 1 / 0.8, and the amount of aluminum nitrate, cerium nitrate, and yttrium oxide is controlled by molar ratio: Y:Al:Ce=3:5:0.06.

[0021] In the manufacturing process, including: mixing, rubbing, heating and heating, burning, heat preservation, cooling and other processes. Firstly weigh the reaction raw materials according to the ratio of the above raw materials, mechanically mix and rub them evenly, start to heat up the temperature, and when it reaches 300-600°C, combustion phenomenon occurs, then raise the temperature to 950°C, keep the reaction at this temperature for 2.5 hours, and gradually cool down to room temperature, a yellow powder was obtained. Ball milling and passing through a 300-mesh sieve to obtain YAG-Ce phosphor.

[0022] Comparing the five groups using differen...

Embodiment 2

[0024] First weigh the burning agent urea and the raw materials for preparing YAG-Ce phosphor: including aluminum nitrate, cerium nitrate, and yttrium oxide; the weight ratio of urea / aluminum nitrate is 1 / 1.2, the amount of aluminum nitrate, cerium nitrate, and yttrium oxide is controlled by molar ratio: Y:Al:Ce=3:5:0.08.

[0025] In the manufacturing process, except that the heat preservation temperature is 1050° C., and the heat preservation reaction time is 2 hours, the method of embodiment 2 is the same as that of embodiment 1.

[0026] Comparing five groups of different organic combustion agents (respectively, hexamethylenetetramine, oxalic acid, adipic acid, ethylene glycol, without adding any combustion agent), the combustion synthesis of YAG-Ce phosphors was carried out, and the experiment See Table 1 for the data of numbers 7, 8, 9, 10, 11, and 12.

Embodiment 3

[0028] First weigh the burning agent urea and the raw materials for preparing YAG-Ce phosphor: including aluminum nitrate, cerium nitrate, and yttrium oxide; the weight ratio of urea / aluminum nitrate is 1 / 1, and the amount of aluminum nitrate, cerium nitrate, and yttrium oxide is controlled by molar ratio: Y:Al:Ce=3:5:0.04.

[0029] In the manufacturing process, except that the heat preservation temperature is 1000° C., and the heat preservation reaction time is 3 hours, the method of specific embodiment 3 is the same as that of specific embodiment 1.

[0030] Comparing five groups of different organic combustion agents (respectively, hexamethylenetetramine, oxalic acid, adipic acid, ethylene glycol, without adding any combustion agent), the combustion synthesis of YAG-Ce phosphors was carried out, and the experiment See Table 1 for the data of numbers 13, 14, 15, 16, 17, and 18.

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Abstract

The embodiment of the invention discloses a method for preparing YAG-Ce fluorescent powder for a white-light LED (light-emitting diode). The method comprises the following steps of: weighing a combustion agent and raw materials comprising an aluminium compound, a yttrium compound and a cerium compound for preparing the YAG-Ce fluorescent powder; uniformly mixing and grinding the materials aforementioned, then starting to heat to 300-600 DEG C until a combustion phenomenon occurs, then heating, insulating and reacting for a period of time, then cooling to a room temperature to obtain yellow powder; and ball-milling and sieving the yellow powder to obtain the YAG-Ce fluorescent powder. According to the method disclosed by the embodiment of the invention, an organic matter is used as the combustion agent, and the YAG-Ce fluorescent powder used in a white-light LED device is manufactured by a combustion method; and because the combustion heat generated by a combustion reaction can be very high, the problems of high needed temperature, energy consumption, no environment friendliness and the like of the traditional high-temperature solid-state method can be effectively solved; a reaction temperature can be greatly reduced to about 1000 DEG C in the method disclosed by the invention from the traditional 1400-1700 DEG C, so as to achieve an effect of low-temperature synthesis, and the manufactured YAG-Ce fluorescent powder is excellent in appearance and light-emitting property; and because the temperature of a synthetic reaction is greatly reduced, the cost of energy is greatly reduced, and the total manufacturing cost is obviously reduced.

Description

technical field [0001] The invention relates to the field of fluorescent powder, in particular to a method for preparing YAG-Ce fluorescent powder for white light LEDs. Background technique [0002] YAG-Ce phosphor is a luminescent material that must be used in white LED devices. Manufacture of YAG-Ce phosphors by means of combustion synthesis can greatly reduce the synthesis reaction temperature, greatly save electricity, and lead to cost reduction. In today's power shortage and high cost, energy-saving and environmental protection technology is especially important. The existing manufacturing methods of YAG-Ce phosphors for white LEDs are basically the traditional high-temperature solid-phase method (or its improved method), and the reaction temperature is high, most of which will not be lower than 1400°C (generally 1400-1700°C). Depending on the type of reaction raw materials, particle changes, and pretreatment, the reaction temperature will vary to a certain extent, bu...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCY02B20/00
Inventor 童义平
Owner HUIZHOU UNIV
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