LED can be doubled by the substrate micro machining

Japan's Prince holdings announced the establishment of the use of fine particle precision coating technology, micro machining technology, and successfully made the LED and organic EL component brightness doubled. The company said it would supply in 2016 the use of the technology for surface processing of sapphire substrate LED. The company in the exhibition "LED Next Stage" (March 4, 2014 ~ 7) at the Tokyo International Convention and Exhibition Center in the exhibition, the use of the technology to produce LED and organic EL components.

Recently, a lot of high efficiency LED use the surface processing of micro bump or wave shaped sapphire substrate "PSS (Patterned Sapphire Substrate)". A large number of cases show that GaN can be used to reflect the light on the substrate by PSS, which can improve the light extraction efficiency of LED, and the luminous efficiency can be increased from 20 to 30%. When making PSS, it is generally used in semiconductor manufacturing technology of lithography and nanoimprint technology.

Use (right) and do not use (left) ND (nano dot array) -PSS when the comparison of the brightness of the LED demo

A comparison of the brightness of organic EL elements on the surface of glass substrate without micro machining. On the right side of the micro machining, Prince holdings, such as the plasma organic EL".

Hundreds of nm and a few mu m composite structure can also be realized

The prince holdings made LED will also use the PSS substrate, but did not use and nano imprint lithography technology, which is used by the company independently developed the ND (nano dot arrays) -PSS ", including the use of micro particle precision coating technology of the company's unique. The company did not disclose the details of the technology, only that in addition to the implementation of the minimum spacing bump construction of 200nm ND-PSS, but also can realize the complex structure ND-PSS by hundreds of nm interval and M interval number combinations.

Examples of micro machined surfaces on sapphire substrates (as published)

Hundreds of nm structure and the construction of a number of examples of M (extracted from the release)

According to Prince holdings, the use of this ND-PSS manufacturing LED luminous wavelength of 385nm components of the front brightness reached 2.4 times the original, full flux also reached the original 1.8 times. However, the luminous efficiency is not released.

In addition, in the trial production of glass substrate using an organic EL element processing technology, increased to about 2 times of red light emitting element front brightness white light emitting element front brightness increased to about 1.7 times, but also to achieve low power consumption and long life. This is because the surface formed on the surface of the glass substrate becomes the bump of the electrode, which is helpful to extract the surface plasma from the electrode surface. "This is a joint study with the Japan Institute of physical chemistry" (Prince Holdings).

Prince holdings plans to start from 2016 to 4 inches as the center for sales of 2 to 6 inches of PSS substrate. The company has not previously sold LED sapphire substrate, this is a new set foot in this field.