Vacuum evaporation - Page 6

The CombOLED project together with CEA-LETI (a French research laboratory) has developed an efficient transparent white OLED. The Small-Molecule OLED has a 5 x 5 cm2 active emitting area, which is deposited using thermal evaporation and encapsulated using ultra-thin layers.

The OLED is 65% - 70% transparent, and emits light from both sides (bottom and top emission). The white luminance reaches 1000Cd.m² at 4 and 4.6 volts for bottom and top emission, respectively. The white OLED efficacy are respectively 11Lm/W and 3Lm/W at 1000Cd.m² for bottom and top emission, which leads to an overall efficiency of 14Lm/W. In this case the color coordinates are (0.40, 0.42) and (0.35, 0.42). When they create the same color for both sides, the efficiency is 10Lm/W and it's only 65% transparent.

The researchers are still working on greater efficiency and improvement of the permeation properties of the thin encapsulation layers.

UPDATE: Here's a video clip of the CombOLED transparent white OLED panel.

Idemitsu Kosan and Universal Display Corporation today announced that they have signed an agreement to extend their collaboration to accelerate the development of phosphorescent OLED materials for use in displays fabricated through dry processing methods, such as vacuum thermal evaporation. The agreement expands the collaboration into red and green phosphorescent OLED materials, in addition to the blue materials that the two companies have been collaborating to develop since December, 2006.

In order to further expand the market for phosphorescent OLED devices, blue phosphorescent OLED materials need to be more fully developed and the quality and lifetime of red and green phosphorescent OLED materials should continue to improve. Therefore, Idemitsu Kosan and Universal Display have agreed to extend their collaboration into red and green phosphorescent OLED materials, in addition to continuing their work together on blue phosphorescent OLED materials. The collaboration is focused on matching Universal Display’s phosphorescent emitters with Idemitsu Kosan’s phosphorescent hosts and other OLED materials. Through this collaboration, both companies expect to improve efficiency and operational lifetime of their respective phosphorescent OLED materials, which in turn should help accelerate the spread of phosphorescent OLED displays and lighting products.

Idemitsu Kosan has been developing OLED materials for middle and large size panels jointly with Sony Corporation (Sony) since 2005, and Universal Display also has been working with Sony since 2001. Idemitsu Kosan and Universal Display expect the results of this collaboration to be utilized for the OLED material development for Sony products.

OLED-T has demonstrated red, green and blue flexible single colour displays manufactured on a plastic substrate using its OLED materials. The demonstrator displays have been developed using a new family of materials developed by OLED-T that can be deposited by vacuum evaporation at manufacturing temperatures around 300oC. This relatively low temperature has enabled OLED-T to demonstrate flexible plastic OLEDs based on vacuum deposition for the first time.

OLED-T is now focussing research and development effort on encapsulation methods to improve the lifetime of its plastic devices. The lifetime of the initial demonstrator red devices was 60 hours at a luminance of 100 cdm-2 and 72 hours for green devices. The limited lifetime is due to high moisture permeability. The corresponding devices manufactured on a glass substrate have lifetimes in excess of 32,000 hours for the same device structure.

Idemitsu Kosan and Universal Display Corporation today announced that they have signed a non-exclusive collaboration agreement to accelerate the development of blue phosphorescent OLED materials. The collaboration will focus on blue phosphorescent OLED materials for use in displays fabricated through "dry" processing methods, such as vacuum thermal evaporation. The collaboration work will start between Universal Display and Idemitsu Kosan immediately after execution of their agreement.

To date, Idemitsu Kosan has been developing and commercializing mainly excellent fluorescent OLED materials (blue, green and red). Idemitsu Kosan is now supplying these materials to OLED display manufacturers throughout the world. Idemitsu Kosan is especially well-known for its blue fluorescent OLED material, which currently has the top market share in the world.

Universal Display is a leading developer of OLED technologies and materials, and holds basic patents on phosphorescent OLEDs. Many OLED display manufacturers are now evaluating Universal Display's PHOLED(TM) phosphorescent OLED technology and its red and green PHOLED materials, and Universal Display's red PHOLED material is currently being used in commercial production.

With Idemitsu Kosan's valuable experience and accomplishments in the development of blue fluorescent OLED materials, and Universal Display's leadership and pioneering efforts in phosphorescent OLED technology and materials, both companies are optimistic that they will be able to accelerate progress in the area of blue phosphorescent OLEDs through this collaboration.