The phosphor of the white LED is mainly a yellow phosphor used in combination with blue. Now, it is gradually transitioning to phosphors that emit red and green light. The reason is that in the future, in the field of liquid crystal displays and lighting applications, the demand for white LEDs using red and green phosphors will increase rapidly.
The competition around this new generation of key components is becoming more and more fierce, and related companies have stepped up their business or started to get involved in this field. The fuse that ignites the transition of phosphors to new materials is a liquid crystal television. This use in particular requires high color expression. A white LED with red and green phosphors is available to meet this requirement.
Since 2010, the number of LED backlights in LCD TVs has increased rapidly, and the LED chips used for this backlight are expected to grow at an average annual rate of about 120%. It is this rapidly expanding market that has facilitated the replacement of major phosphor materials.
High-performance white LEDs with red and green phosphors
The white LEDs realized by combining the blue LED chips and the red and green phosphors are different from the ordinary white LEDs obtained by combining the blue LED chips and the yellow phosphor YAG. If it is used for backlights, the spectra of the blue, green, and red colors are separated from each other, and the color expression is improved. For lighting applications, it is necessary to form a continuous spectrum with a wavelength of about 500 nm to 650 nm, which is close to sunlight. The color rendering is relatively high.
Mitsubishi Chemical monopolizes the market
As the phosphors change, the mutual status between companies is gradually changing. The yellow phosphor used for white LEDs will be dominated by YAG materials. The world's largest company in the field is the Nichia Chemical Industry, which has a global market share of more than 30%.
But if it turns into a red and green phosphor, the situation is completely different. At present, Mitsubishi Chemical has an absolute advantage in this field. The company currently accounts for almost 100% of the red phosphor market for white LEDs; Mitsubishi Chemical's share. In terms of green phosphors, it also accounted for nearly 40% of the total as of 2009.
The reason why Mitsubishi Chemical has a high share is because the company has been engaged in the red and green phosphor business, which has high brightness and is difficult to reduce even if the temperature rises. For example, CASN (CaAlSiN3:Eu) and SCASN ((Sr,Ca)AlSiN3:Eu) are sold in the case of red phosphors, and BSS and CSO are sold in green phosphors. Among them, the reason for being able to monopolize the red phosphor market is that the company holds the basic patents of CASN and SCASN together with the Material Materials Research Institute (NIMS) (patent number 3837588 in Japan). In fact, many LED manufacturers, including Nichia Chemical, have purchased CASN and SCASN from Mitsubishi Chemical. The green phosphor CSO and red phosphor CASN used in combination with the blue LED chip have higher stability. For example, even if the temperature rises, the luminous intensity is not easily lowered as compared with the ordinary yellow phosphor YAG.
With this momentum, Mitsubishi Chemical plans to expand the phosphor business of white LEDs. The goal is to achieve sales of 5.5 billion yen in fiscal 2010, and 20 billion yen in 2010 by nearly four times in fiscal year 2015. At the same time, it is planned to invest 7 billion yen by 2015 and increase production capacity to 6 times in 2010.
Can you break the situation of Mitsubishi Chemical's exclusive market?
Various manufacturers have made unremitting efforts to break the current situation of Mitsubishi Chemical's exclusive market. In the field of red phosphors, Nichia Chemical Industry held a press conference in June 2010 to announce that it also holds a number of CASN and SCASN related patents, and holds patents held by Nichia Chemical Industry Co., Ltd. Patent numbers in Japan are 4414821, 4415065, 4422653, 4511849, 4511885, etc. They are also patented in the United States and Europe. Undoubtedly, in the future, in addition to restricting emerging manufacturers from producing red phosphors without permission, there will be many initiatives to shake the stability of Mitsubishi Chemical. In fact, Nichia Chemical intends to negotiate with Mitsubishi Chemical with its patents as a weapon, in order to allow Mitsubishi Chemical to make favorable concessions in the manufacture and use of CASN and SCASN. However, Mitsubishi Chemical strongly stated that No patents were infringed in the red phosphor business. For example, Nichia Chemical Industries can also manufacture CASN and SCASN by itself and use it in white LEDs.
The white LED market is expected to see explosive growth. As a result, competition around red and green phosphors will become more intense in the future.
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