Toshiba has developed the industry's smallest size 0.65mm square lighting with white LED "CSP-LED". The product uses the wafer level chip size package (Chip Scale Package:CSP) technology to achieve, the packaging area of more than 50% of the product than competitors. Toshiba said that due to the light source can become very small, so the flexibility of lighting design increases, but also can not be used for the packaging of light space". Toshiba will begin to supply samples from late April 2014.
Luminous CSP-LED. The left side is white light (color temperature is 5000K) type, the right is the bulb color (color temperature is 2700K) type
Toshiba has been in the production of white LED using GaN-on-Si technology, the technology on the caliber of 200mm silicon wafers formed on the GaN layer. Is characterized by lower cost than sapphire substrate manufacturing. Allegedly, the current volume of production reached 50 million ~ 100 million months.
Achieved 0.65mm square size
Core technology of semiconductor
Toshiba semiconductor & memory company division semiconductor business white LED application technology of white LED application technology of the first responsible person, team leader Matsuo Eita said, "the Toshiba semiconductor sector shared by the core technology - encapsulation technology and copper interconnection technology applied to white LED". Specifically, the use of the RF component packaging wafer level CSP technology applied to the white LED. The technology can be used to route, form terminals, encapsulate the resin and cut into pieces in wafer state. In order to apply this method to the white LED, Toshiba has developed a component structure that can be directly pulled out from the back of the light-emitting layer without wire bonding.
The outline of wafer level CSP process is as follows. First, a copper electrode is formed on the 200mm wafer forming a white LED, and the resin is encapsulated. Then, the wafer surface is removed from the silicon substrate. Finally, the phosphor layer is formed on the whole wafer and cut into pieces. Toshiba semiconductor & memory company division semiconductor business white LED application technology of white LED technology first head sogabe Shou said, "we all to the phosphor layer film forming conditions of processes into their own technology and experience".
According to Toshiba, the size of the white LED lighting, after the smallest is also around 1mm square. In contrast, the development of the product packaging area will be reduced by more than 50%. Compared with the company's original product, cut about 90%. As a result, it can also be packaged to a substrate such as a thin wire that is difficult to package.
Toshiba will be the first to use the technology for the input power of 0.2 ~ 0.6W products. White light (color temperature is 5000K) and bulb color (color temperature is 2700K) products, from late April 2014, other types of products will be available from the beginning of May 2014 samples. Price of about 20 yen. The company will consider the application of wafer level CSP products as a pillar of white LED product line, the future will also add the plan for the input power in the 1W class products.
Show the product development of lighting exhibition "held in Frankfurt, Toshiba will begin in March 30, 2014 Lightbuilding".
The luminous efficiency of the sapphire substrate by catching the product
Toshiba started late in the field of white LED business. It is said that the current market share of less than 1%. The company wants to use its expertise in the use of semiconductor technology to the white LED, thereby restoring the decline. GaN-on-Si technology and the introduction of wafer level CSP technology is a representative example. Toshiba plans to use these as a differential technology to gain a market share of 10% in the year 2016.
Under normal circumstances, compared with the use of sapphire substrate white LED, GaN-on-Si white LED although the advantages in manufacturing costs, but the poor luminous efficiency. Recently, the difference in luminous efficiency has been shortened a lot. Such as Toshiba's white LED, mass production of the nominal value of 135 to 140lm/W, in the R & D level of more than 150lm/W".
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