Solution based OLEDs - Page 18

Universal Display Corporation today reported significant progress in the development of P2OLED printable, phosphorescent OLED materials for use with solution-based manufacturing processes, which display manufacturers consider a prospective solution for the cost-effective production of large-area OLED displays.

Reported in a joint paper with Seiko Epson Corporation (Epson) given today at the Society for Information Display’s 2007 International Display Workshop (IDW) Conference in Sapporo, Japan, these advances are the result of a three-year joint development program during which the two companies focused on the successful demonstration of Universal Display’s P2OLEDs for application to Epson’s proprietary ink-jet printing process technology.

Given by Epson’s Takuya Sonoyama, the paper reported progress in red, green and blue P2OLED device performance in spin-coated devices and ink-jet printed devices. Demonstrating the high luminous efficiency of PHOLED technology, the team made significant progress in extending the operating lifetimes of its red and green material P2OLED systems: Red with CIE(0.66, 0.33), luminous efficiency of 9 cd/A and > 50,000 hours of operating lifetime to 50% of initial luminance (at 500 cd/m2) and green with CIE(0.33, 0.63), 35 cd/A and > 50,000 hours (at 1000 cd/m2). The team also reported data for a new sky blue P2OLED with CIE(0.19, 0.40), 18 cd/A and > 3,000 hours (at 500 cd/m2). In addition, results with ink-jet printed P2OLED devices were reported which demonstrate the excellent film-forming ability of the small molecule layers. Ink-jet printed green P2OLED devices were also demonstrated to have the same efficiency as those of the spin-coated control P2OLEDs following an in-depth study of solvent selection and process optimization.

Universal Display’s PHOLED technology and materials, which offer up to four times higher energy efficiency than traditional OLED systems, are today being used in products manufactured using conventional vacuum thermal evaporation (VTE) equipment. P2OLED materials and technology, based on this same PHOLED technology, are designed for use with solution-based processes such as ink-jet printing.

Data from spin coated devices using a common cathode and interlayer material demonstrate lifetimes for recently developed solution-processable green and red PLED materials of 78,000 hours and 67,000 hours, respectively, from an initial luminance of 1000 candelas per square meter, or cd/m2. This is equivalent to approximately 445,000 hours and 420,000 hours from an operating brightness of 400 cd/m² for these materials.

These latest lifetimes represent a 60% and 280% increase in performance for green and red materials over results that were announced in May and March of this year, respectively.

Sumitomo Chemical announced that it is going to acquire Cambridge Display Technology (CDT) for $12 per share in cash - for a total of around $285 million. This represents a 107% premium over CDT's 90-day average closing share price.

Sumitomo says that it is considering its display materials business as one of its strategically important business area and an area of focus for the business resources. They expect the OLED market to see considerable market growth in the future. Sumitomo is already collaborating with CDT.

Cambridge Display Technology (CDT) today announced that in collaboration with Thorn Lighting and the University of Durham, the Company has been awarded a GBP1.6 million grant by the UK Department of Trade and Industry-led Technology Programme. The grant will part fund a three year project to develop solution processable organic materials and device architectures suitable for large area white lighting applications. The total project cost is GBP3.3 million.

Under terms of the grant, CDT, through its Sumation joint venture, will provide materials, device architecture and testing, modeling, and technical input. The project is aimed at developing materials and devices for solid-state, high efficiency lighting applications based on CDT's patented PLED technology. Light emitting polymer materials can be solution processed and offers the potential of low cost manufacturing for large lighting panels. Successful completion of this project will offer novel lighting products with environmental benefits.

The 160 ppi three inch full color display incorporates CDT's PLED technology and was produced by CDT using a Litrex Gen 2 inkjet printer on amorphous Si TFT substrates provided by Casio. The company stated that since starting the project in fall of 2006, CDT has been able to demonstrate that it can achieve the accuracy required to produce the displays over 14-inch substrates.

The achievement of printing 160 ppi high resolution is the combination of Casio backplane design, Litrex printer droplet accuracy, CDT's know-how on ink formulation, and optimized print strategy.

Cambridge Display Technology and Sumation are pleased to announce new and improved results for green and blue PLED materials.

Data from spin coated devices using a common cathode and a recently developed solution processable green PLED material demonstrate lifetimes(1) of 50,000 hours from an initial luminance of 1000 candelas per square meter, or cd/sq.m. This is equivalent(2) to over 285,000 hours from an operating brightness of 400cd/sq.m for this material and represents a 40% increase in lifetime compared to results announced on March 27, 2007.

OTB Display today announced that it received an order from Universal Display Technology (Jilin) for in-line equipment for the manufacturing of full color OLED displays. The fully integrated OLED production system is based on solution-processed polymers and OTB's thin-film encapsulation technology, making it one of the world's first production lines that integrates the complete display cell manufacturing process.

Universal Display Technology (Jilin) Co., Ltd. acquired an OLED manufacturing turn-key solution including equipment, related services and process know-how. OTB Display will build up mass production capabilities at Universal Display Technology (Jilin) Co., Ltd manufacturing facility, which is located in the Changchun National High-Tech Industries Development Area in the Jilin Province of the People's Republic of China. The Universal Display Technology (Jilin) Co., Ltd. will commence mass production of OLED displays in 2008.

Cambridge Display Technology (CDT) and Sumation are pleased to announce new growth in lifetime metrics for red, green, blue, and white PLED materials.

Data results from spin coated devices using a common cathode and solution processable materials developed in 2006 demonstrate that lifetimes(a) of 24,000, 35,000, 10,000, and 5,200 hours for red, green, blue, and white, respectively, have been achieved from an initial luminance of 1000 cd/m². This is equivalent(b) to over 150,000, 198,000, 62,000, and 27,000 hours from an operating brightness of 400cd/sq.m for these materials.

Following quickly behind the recent announcement of rapid progress in the development of longer lifetime blue light emitting polymers, comes this announcement of similarly impressive progress on red materials.

Data from devices produced using these latest, solution processable, phosphorescent materials show lifetime of 98,900 hours from an initial luminance of 400 cd/m², equivalent to over 1.5 million hours from 100 cd/m².

Universal Display Corporation today announced significant advances in the development of P(2)OLEDs printable, phosphorescent OLEDs as part of an ongoing joint development program with Seiko Epson Corporation. The demonstration of P(2)OLED materials that possess the high-efficiency of Universal Display's PHOLED phosphorescent technology, as well as ink-jet printing potential, is an important step toward the realization of cost-effective, large-area OLED displays. OLED displays are currently used in cell phones, MP3 players and PDAs, and are widely recognized as a strong candidate for use in the next generation of flat screen televisions.

After working together for less than two years, Universal Display is reporting key achievements in the development of a P(2)OLED system based on solution-processable, small-molecule PHOLED materials. These results include significant lifetime and efficiency advances for red and green color emitters.