[Source: "High-tech LED - Technology and Applications" November issue]
In 2012, the development of China's LED commercial phosphors, like China's LED packaging industry, was still affected by many negative factors such as the global economy. It still did not shake off the weak trend in the second half of last year, and was in a state of no increase in profits. In 2012, China's commercial LED phosphors showed a clear development trend. In the field of LED lighting, with the requirement of LED lighting for color rendering index, that is, CRI should reach 80 or above, it is gradually becoming a parameter that must be achieved. It has also become the transformation year of LuAG yellow green powder + nitride red powder instead of single YAG yellow powder; in the field of LED backlight display, in 2012, the trend of LuAG phosphor replacing the original silicate green powder has been finalized, especially in high-end backlight display devices. On the other hand, in the middle and low end, there is also a strong call for the use of LuAG phosphors instead of the existing silicate phosphors.
In 2012, China's LED phosphor market mainly used three kinds of LED phosphor products to match blue light chips to white light, including alumina aluminate phosphors, LED silicate phosphors and LED nitrogen (oxygen) compounds. Phosphor. This article will combine the technical status of China's commercial LED phosphors in 2012 and its future development trends to elaborate, aiming to provide a certain reference for the development of the industry.
First, the application status of LED phosphors in the field of backlight display
In the field of LED backlight display, it has experienced three stages of mobile phone backlighting - notebook backlighting - LCD TV backlighting. Since 2009, the company led by South Korea's Samsung has sold a large number of LCD TVs with white LEDs as backlights, which has successfully led white light. The tremendous development of the LED packaging industry has far-reaching significance. The white LED backlight mainly uses a combination of blue chip + red phosphor + yellow (green) phosphor, wherein the wavelength of the red phosphor is usually 620 ~ 630 nm, and the wavelength of the yellow (green) phosphor is usually 540 ~ 545 nm .
Regarding the choice of LED red powder, due to the excessive attenuation of sulphide red powder and irritating odor; other such as molybdate, vanadate, etc., such as narrow excitation range, low luminescence brightness and poor reliability, so In terms of LED-backlit LCD TV devices, nitride red powder was basically selected from the beginning, and CaAlSiN3:Eu (referred to as 1113 red powder) was mainly used. From the current use situation, with the continuous improvement of the quality of 1113 red powder products, The balance between production capacity and price is generally satisfactory.
The choice of yellow (green) phosphors is different. Because the half-peak width of the aluminate system is wider and the color saturation is lower, it is difficult to meet the NTSC standard value. Therefore, the industry first chooses to use silicate yellow. (Green) powder, however, as the problem of silicate reliability has become more and more serious, in the past two years, the high-end backlight display field has begun to adopt β-Sialon:Eu (referred to as β-Seilon) green powder as an alternative. Technically, it has already played a good effect. However, the high price of this beta-sialon limits, to a large extent, its use in low- to mid-end backlight display devices. Therefore, many LED backlight packaging manufacturers are trying to use yellow-green powder with better cost performance, such as LuAG, but from the current experimental conclusions, the effect is not satisfactory, the main reason is that although LuAG has higher brightness, it is also There is a wide width at half maximum and low color saturation, which does not reach the standard NTSC value. Therefore, various tests are needed to verify, allocate or select other systems.
The technical status of the above-mentioned aluminum aluminate phosphors for LEDs, silicate phosphors for LEDs, and nitrogen (oxygen) phosphors for LEDs are briefly described as follows:
1. Aluminate phosphor for LED
The aluminate phosphor for L ED is a very stable physicochemical compound. In 2012, aluminate phosphors remained the most commonly used compound system in the LED industry, including derivative compounds such as YAG, LuAG and TAG.
Aluminate phosphors for LEDs, of which YAG phosphors are the most typical. The highest measured external quantum efficiency of this phosphor is close to 0.93, which is also a relatively well-developed phosphor. In the market, YAG phosphors are divided into different chip wavelengths, and more importantly, the use of white LED products is matched according to the particle size, and the balance of brightness and yield is achieved. For example, Taiwan Hongdae's first typical low-power phosphor, particle size D50 is concentrated at 7-8 microns; rare earth SMD phosphors, particle size D50 concentrated at 9-10 microns, and COB phosphors, particle size D50 concentrated above 20 microns Intermec's medium and high power phosphors, with a particle size D50 concentrated at 13-15 microns, are preferred counterparts based on the actual development needs of the LED industry. However, since the YAG phosphor is used alone, there is a problem that the color rendering index is low in the field of LED illumination. Therefore, some international manufacturers, including some domestic packaging companies, have gradually begun to transform to other color phosphor varieties, such as LuAG.
Unfinished
For more information, please refer to the November issue of "High-tech LED - Technology and Applications"
In 2012, the development of China's LED commercial phosphors, like China's LED packaging industry, was still affected by many negative factors such as the global economy. It still did not shake off the weak trend in the second half of last year, and was in a state of no increase in profits. In 2012, China's commercial LED phosphors showed a clear development trend. In the field of LED lighting, with the requirement of LED lighting for color rendering index, that is, CRI should reach 80 or above, it is gradually becoming a parameter that must be achieved. It has also become the transformation year of LuAG yellow green powder + nitride red powder instead of single YAG yellow powder; in the field of LED backlight display, in 2012, the trend of LuAG phosphor replacing the original silicate green powder has been finalized, especially in high-end backlight display devices. On the other hand, in the middle and low end, there is also a strong call for the use of LuAG phosphors instead of the existing silicate phosphors.
In 2012, China's LED phosphor market mainly used three kinds of LED phosphor products to match blue light chips to white light, including alumina aluminate phosphors, LED silicate phosphors and LED nitrogen (oxygen) compounds. Phosphor. This article will combine the technical status of China's commercial LED phosphors in 2012 and its future development trends to elaborate, aiming to provide a certain reference for the development of the industry.
First, the application status of LED phosphors in the field of backlight display
In the field of LED backlight display, it has experienced three stages of mobile phone backlighting - notebook backlighting - LCD TV backlighting. Since 2009, the company led by South Korea's Samsung has sold a large number of LCD TVs with white LEDs as backlights, which has successfully led white light. The tremendous development of the LED packaging industry has far-reaching significance. The white LED backlight mainly uses a combination of blue chip + red phosphor + yellow (green) phosphor, wherein the wavelength of the red phosphor is usually 620 ~ 630 nm, and the wavelength of the yellow (green) phosphor is usually 540 ~ 545 nm .
Regarding the choice of LED red powder, due to the excessive attenuation of sulphide red powder and irritating odor; other such as molybdate, vanadate, etc., such as narrow excitation range, low luminescence brightness and poor reliability, so In terms of LED-backlit LCD TV devices, nitride red powder was basically selected from the beginning, and CaAlSiN3:Eu (referred to as 1113 red powder) was mainly used. From the current use situation, with the continuous improvement of the quality of 1113 red powder products, The balance between production capacity and price is generally satisfactory.
The choice of yellow (green) phosphors is different. Because the half-peak width of the aluminate system is wider and the color saturation is lower, it is difficult to meet the NTSC standard value. Therefore, the industry first chooses to use silicate yellow. (Green) powder, however, as the problem of silicate reliability has become more and more serious, in the past two years, the high-end backlight display field has begun to adopt β-Sialon:Eu (referred to as β-Seilon) green powder as an alternative. Technically, it has already played a good effect. However, the high price of this beta-sialon limits, to a large extent, its use in low- to mid-end backlight display devices. Therefore, many LED backlight packaging manufacturers are trying to use yellow-green powder with better cost performance, such as LuAG, but from the current experimental conclusions, the effect is not satisfactory, the main reason is that although LuAG has higher brightness, it is also There is a wide width at half maximum and low color saturation, which does not reach the standard NTSC value. Therefore, various tests are needed to verify, allocate or select other systems.
The technical status of the above-mentioned aluminum aluminate phosphors for LEDs, silicate phosphors for LEDs, and nitrogen (oxygen) phosphors for LEDs are briefly described as follows:
1. Aluminate phosphor for LED
The aluminate phosphor for L ED is a very stable physicochemical compound. In 2012, aluminate phosphors remained the most commonly used compound system in the LED industry, including derivative compounds such as YAG, LuAG and TAG.
Aluminate phosphors for LEDs, of which YAG phosphors are the most typical. The highest measured external quantum efficiency of this phosphor is close to 0.93, which is also a relatively well-developed phosphor. In the market, YAG phosphors are divided into different chip wavelengths, and more importantly, the use of white LED products is matched according to the particle size, and the balance of brightness and yield is achieved. For example, Taiwan Hongdae's first typical low-power phosphor, particle size D50 is concentrated at 7-8 microns; rare earth SMD phosphors, particle size D50 concentrated at 9-10 microns, and COB phosphors, particle size D50 concentrated above 20 microns Intermec's medium and high power phosphors, with a particle size D50 concentrated at 13-15 microns, are preferred counterparts based on the actual development needs of the LED industry. However, since the YAG phosphor is used alone, there is a problem that the color rendering index is low in the field of LED illumination. Therefore, some international manufacturers, including some domestic packaging companies, have gradually begun to transform to other color phosphor varieties, such as LuAG.
Unfinished
For more information, please refer to the November issue of "High-tech LED - Technology and Applications"
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