SolMateS developed ITO deposition technology without damage

The Dutch deposition equipment specialized company SolMateS unveiled the new OLED deposition process.

The newly developed deposition process by the SolMateS is a full transparent OLED called ‘soft-landing’ based on SolMateS’ pulsed laser deposition (PLD), which already obtained the patent. According to the SolMateS, the existing deposition technology like sputtering may cause damage to organic layers whereas the ‘soft-landing’ method enables to put an ITO thin layer on top of the OLED without damaging as it is proceeded in an even process temperature.

And recent test result shows not much difference in their functions between the OLED of 80% transparency and aluminum electrode OLED of no transparency. The ITO was deposited in the speed of sputter and PLD tool of 200mm is possible.

Arjen Janssens, the CEO of SolMateS mentioned that ‘PLD technology can be applied to various OLED applications using multiple transparency such as transparent lighting, display, smart window or top emitting OLED display, and it will be of great help for highly efficient organic solar cells.’

Established in 2006 in the Netherlands, the SolMateS is the deposition equipment supplier based on the laser deposition.

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Source – SolMateS

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LGD, Plastic OLED Technology Announcement

LG Display (LGD) is promoting actively as unveiling the plastic OLED technology applied to its own G Watch R.

It is published under the title ‘The New Advancement in Display technology: LG Display’s Plastic OLED’ on the LGD’s U.S Newsroom (http://lgdnewsroom.com/) and the contents are as follows.

 

The New Advancement in Display technology: LG Display’s Plastic OLED

What is Plastic OLED?

Plastic OLED is an OLED that is made out of plastic substrate. There are 4 very special key technologies applied to this OLED.

1) Plastic, not glass

LG Display has shattered the common belief that plastic cannot stand high temperatures, and developed plastic substrate (PI or polyimide) that remains stable under high temperatures and has chemical stability. Moreover, due to the development of the coating process of large format PI, it has become possible to manufacture PI film, which has enabled the plastic curving technology and the technology to eliminate unnecessary bubbles and foreign substances.

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2) LTPS(Low Temperature Poly Silicon) TFT(Thin Film Transistor) technology

One of POLED’s important features is that it can have thin bezel, since the fast electron mobility technology made the integration of different parts to be possible.

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3) Flexible Encapsulation Technology to protect OLED elements

With the technology to manufacture inorganic film that prevents water and organic film that prevents alien substances, plastic OLED guarantees the stability of OLED elements.

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4) Elimination of Carrier Glass using laser, and adhesionof Back Plate Film

The display surface is relatively clean and neat, as it prevents foreign substance from permeating the surface, by using Laser Source Uniformity technology, alien substance/crack prevention process technology, and flat-panel Back Plate Film and Film Lamination technology.

 

Why Plastic OLED?

1)Compared to currently existing displays, Plastic OLED has simpler structure. As it can be seen from the diagram below, LCD is composed of many layers of boards, while OLED’s structure is very simple.

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2)While glass displays are prone to breakage, Plastic OLED, which is film based, is flexible to be curved to a certain angle, and it does not break easily.

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3)Compared to LCD and glass OLED displays, Plastic OLED is thinner and lighter.

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The future of Plastic OLED

As Plastic OLED can be applied to curved displays that are bent to a certain curvature, it can be used in various ways, including electronic goods, such as mobile phones, monitors, and TV, as well as cars, wearable devices, and items for interior design.

Other than its design, Plastic OLED is valuable in terms of portability and durability as well. Hence, it seems that Plastic OLED will play an important role in people’s everyday lives in the future.

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The Plastic OLED’s potential is very promising. LG Display is devoting its energy and resources to respond quickly to fast growing market and consumers’ needs in order to develop Plastic OLED to become the key OLED application technology in the future.

 

Source – LG Display Newsroom

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Solution Processing OLED Era is coming

At the International Workshop on Flexible & Printable Electronics, IWFPE held in Jeonju, Konica-Minolta and DuPont presented diverse technologies that converts the OLED production process which requires a glass substrate into the technology of using a flexible substrate and printing technology.

Konica-Minolta is under development of the OLED panel for lighting and the production of a flexible OLED panel as a printing technology of R2R method for the first time in the world is imminent. Based on the camera film production technology, Konica-Minolta has a wide range of light-emitting materials technology and also the R2R technology at the same time, getting attention as a front-runner to open a new era of flexible electronics.

DuPont is the pioneer of the solution processed OLED display business as well. Equipped with the nozzle printing method which is its own printing technology, it continued to research and develop for many years with Samsung Display. The most critical benefit of the solution OLED is that it is the only technology to manufacture a large area OLED panel over 55-inch with RGB method at a large equipment bigger than the Gen8. DuPont completed the technological development of containment creation, ink deposition, and ink drying which are the essential technologies for the production of the solution OLED panel and is accelerating the commercialization. DuPont prospects that the solution OLED panel market will be open within three years at the latest.

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Development of the high efficiency solution processed fluorescent organic light-emitting device

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Korean researchers have developed the highly efficient florescent organic light-emitting device which enables to enhance the efficiency more than three times and is receiving much attention as the next generation display.

This research by the Prof. Jun Yeob Lee, the Ph.D. candidate/researcher Yong Joo Cho (the 1st author) and the Prof. Kyoung Soo Yook from the Department of Polymer Science and Engineering at Dankook University was supported by the Mid-career Researcher Program funded by the Ministry of Science, ICT and Future Planning and the National Research Foundation of Korea as well as the General Researcher Program funded by the Minister of Education and the National Research Foundation of Korea, and the research results were published on the Advanced Materials which is the international journal covering  materials science on the 15th October. (Paper Title: High Efficiency in a Solution-Processed Thermally Activated Delayed-Fluorescence Device Using a Delayed-Fluorescence Emitting Material with Improved Solubility)

Using the solution processing, it is expected to ease and simplify the process of producing the organic light-emitting device as the large area compared to the existing vacuum deposition plating.

However the problem is that when a device is produced through the solution processing using the existing fluorescent emitting material, the efficiency (external quantum efficiency) is only 5%. This is much less than the 20% which is the efficiency when produced by the vacuum deposition plating process.

The research team developed the high efficiency fluorescent organic light-emitting device, improved three times more than the previous fluorescent device for the solution processing. Compared to the existing structure, a solubility was increased by introducing the alkyl group as a substituent. Furthermore, the Donor-Acceptor Structure was employed to realize high efficiency by inducing delayed fluorescence phenomenon.

It is anticipated to advance the commercialization of a large scale organic light-emitting device for the enlargement of a future display.

The decrease of efficiency issue was resolved by making the surface film coating of a device smooth through the development of a new fluorescent light-emitting material which is soluble in organic solvents.

And introducing the strong Donor – Acceptor structure, it was possible to improve the efficiency as drawing delayed fluorescence phenomenon. The Donor – Acceptor structure refers to a monomer composed of an entity that donates electrons to another compound and that accepts electrons transferred from another compound.

Professor Lee revealed that “The following research will be continued to commercialize the solution processed fluorescent organic light-emitting device by developing a new material to improve not only the efficiency but also the lifespan of a device and a device structure appropriate for a solution processing.”

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What is the optimal encapsulation technology for the Flexible AMOLED?

Currently mass-producing flexible AMOLED panels are taking PI substrate, backplane, and RGB deposition method, and the existing encapsulation technologies for A2 line of Samsung Display is TFE (thin film encapsulation) and hybrid encapsulation for LG Display.

But for the flexible AMOLED exclusive A3 line which is newly invested by the Samsung Display, advanced the orders not in the TFE but in the hybrid encapsulation method which is laminating the film after resin coating process on the passivation structure of inorganic layer and organic layer, similar to the method that the LG Display takes.

The reason for the change of encapsulation technology at the A3 of Samsung Display was analyzed in the “2014 Flexible OLED Report” issued by the UBI Research including the latest trends and issues such as the flexible AMOLED related issues and processes, market forecast of the flexible AMOLED panel and flexible OLED lighting, flexible AMOLED technologies comparison of Samsung Display and LG Display, etc.

According to this report, the flexible AMOLED panel market is forecasted to show a compound annual growth rate of about 60% through to 2020, reaching $ 17,600 million where the primary applications are expected to be for the flexible AMOLED panel of tablet pc.

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<Flexible AMOLED panel Market Forecast>

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OLED TV cost saving, the alternative is co-planar structure

Current AMOLED panel market is mainly led by either Samsung Display or LG Display, mass producing the LTPS backplane for mobiles and Oxide backplane for TVs.

 

Though the AMOLED panel market for mobiles has established stable position in the business beyond LCD panel market, the market for TV is having difficulties in settling for its high price compared to the LCD/LED TV, requiring pressing technological development to lower the cost.

 

As a counterplan for this, the LG Display received a considerable attention at the SID 2014 by exhibiting 65-inch curved UHD OLED TV applying not the existing etch stopper layer (ESL) structure but the co-planar structure.

 

According to the “2014 AMOLED Backplane Technical Report” published by the UBI Research, it was analyzed that there is a difference in the investment expenses by about $ 80 million when making the additional investment in oxide TFT AMOLED line of co-planar for a-Si LCD line against the supplementary investment in oxide TFT AMOLED for LCD line. (For Gen 8) It was also suggested that the co-planar structure is appropriate for the oxide TFT structure which can make the best use of the backplane and color filter equipment of the previous a-Si LCD line as the mask can be used under 6 layers.

 

In addition, the core issue of the AMOLED industry which is a technological concern over the flexible LTPS applied to the flexible display was examined along with the latest technology trend analysis of LTPS, oxide, and organic TFT in the “2014 AMOLED Backplane Technical Report”.

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KITECH, Developed the world’s first refining technology for organic light-emitting material using ILs for OLED TV

Dr. Taewon Kim’s team of photovoltaic energy convergence research group of Korean Institute of Industrial Technology (KITECH, President Yong-Soo Lee) developed an original technology to refine organic light-emitting materials in bulk for fine OLED TV at low price.

Dr. Kim’s team established a new concept for the refining technology by using Ionic Liquids (ILs), and it can solve issues of high cost·low yield rate arisen in production of the organic light-emitting material for the OLED TV.

Ionic Liquids are liquids that only consist of positive and negative ions at room temperature and stays in liquid form at high vacuum (~100℃) with almost no volatility. Recently, ILs became a future clean solvent in green chemistry field with a strength of good solubility for high molecular substance and a feature of metal salts.

Until now, ‘sublimation refining method’ has been used to get high purify organic light-emitting material by utilizing the difference of sublimation points between vaporization and solidification of a material. However, cons of this method are low yield rate and very high production cost because it is impossible to realize complete auto and continuous process.

To address this issue, Dr. Kim’s team started developing the large scale refining technology for the organic light-emitting materials at low cost since 2011 and applied for original patent in December, 2012. Their effort on verifying the possibility of the technology’s application produced this result in 19 months.

The key of the result is the application of the high purity refining technology on the organic light-emitting material for the OLED TV by focusing on the non-volatile feature of ILs at high vacuum·high temperature.

This technology uses a principle of separating impurities in the order of vaporizing the organic light-emitting material in a vacuum chamber; dissolving it in a liquid filter of ionic liquid; and recrystallizing supersaturated material in the liquid. It enables to get 99.95% of high purity organic light-emitting material through one refining process.

It is a completely new concept of large scale refining method based on the non-volatility characteristic of ionic liquid at high vacuum·high temperature.

The team is credited with the success of new technology development which can overcome the cons of the existing sublimation refining method including refinery yield rate, automation and continuous process of equipment, and efficiency of mass production. It is also expected to bring a huge cost reduction effect by recycling; collect and reprocess during refinery process, of the expensive but non-volatile ionic liquid.

According to “2014 OLED Emitting Material Annual Report Market Forecast (~2020)” by a professional OLED market research firm, UBI Research, the OLED emitting material market is expected to grow to 1.3 trillion won in 2017 from 2014 estimation of 543 billion won. Forecasted annual growth rate is over 30% and experts see that the growth will be much larger if large size display market including the AMOLED TV expends in full-scale.

Dr. Taewon Kim, said, “this technology increased the yield rate and decreased the production cost by more than 50%. And an ultimate goal is to reduce the current price by one tenth” and “technology development is in progress with companies.” He also said, “the success is a game changer with enormous potential to turn the OLED TV market-to-explosively grow” and “based on the low-cost and large scale refining original technology, domestic businesses will largely contribute to preoccupy the global market of forward-backward industry regarding the OLED TV.”

The team currently applied 16 cases for patent with related process․equipment technology in and out of the country and plans active technology transfer to related businesses.

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<Comparison of refining methods for organic light emitting materials Source: KITECH>