Power consumption - Page 11

Researchers from the Max-Planck-Institute for Polymer Research (MPI-P) have built upon new understanding on organic electronic material defects to suggest ways to design higher efficiency OLED materials.

The researchers explain that they have discovered that clusters of water inside organic semiconductors can function as hole traps, and oxygen clusters can capture electrons in hole-dominated organic semiconductors. Even a small number of such water and oxygen defects can cause highly unipolar charge transport and harm the efficiency of the materials.

The 2019 OLED laptops are now shipping, all with the same display, an SDC 15.6" 4K (3840x2160) AMOLED.

Reviewers from Notebook Check tested the Dell XPS 15 7590 OLED laptop to see how the power consumption of the display changes with the content used.

The United States Department of Energy (DoE) granted $1.05 million for OLEDWorks, allocated through the DoE's Small Business Innovation Research (SBIR) program. The funds will be used to further improve efficiency and lower the costs of flexible OLED lighting panels, which will help reduce energy consumption while simultaneously providing healthier, unique lighting solutions that are cost competitive in the main stream lighting markets.

In November 2018 OLEDWorks announced that its first flexible OLED lighting panels are now commercially available. The OLEDWorks LumiCurve Wave are produced on Corning's 0.1mm thin Willow Glass flexible glass substrates. OLEDWorks says that the Wave panels are extremely thin and light and deliver the superb light quality and excellent color rendering that is uniquely achievable with OLED.

Researchers from TU Dresden developed a new method to extract trapped photos from OLED devices. The idea is to generate controllable nanostructures with directional randomness and dimensional order. This method is said to significantly boost the efficiency of white OLED devices. The researchers report that it is possible to achieve an external quantum efficiency of up to 76.3%.

To produce the nanostructures, the researchers use reactive ion etching, a facile, scalable and lithography-free method. In addition to these advantages, the method enables to specifically control the topography of the nanostructures by adjusting the process parameters.

Researchers from the Max Planck Institute for Polymer Research (MPI-P) have developed an efficient OLED device that is comprised of a single organic material layer - replacing the normal stack of 5-7 layers in modern OLED devices.

The researchers managed to create this OLED device by using a TADF material (CzDBA, diboron based TADF) and by using a newly developed charge injection strategy. The OLED device features a low operating voltage (2.9V at 10,000 cd/m^₂, an EQE of 19% (at 500 cd/m²) and a lifetime of 1,880 hours at 50% (for 1,000 cd/m²). The color of the device is greenish-yellow.

The US Department of Energy (DoE) has granted $1.1 million to Penn State University professors Chris Giebink and Michael Hickner for a new project to increase the efficiency of OLED lighting panels.

The researchers, collaborating with OLEDWorks in this project (and previous ones as well), aim to find a way to lower the refractive index of the organic materials which will increase the external efficiency of OLED devices. The basic idea is to insert other molecules and blend them with the existing OLED materials which lower the refractive index without adversely affecting the properties of the original molecules.

In 2010 Universal Display announced a new AMOLED display architecture called RGB1B2 that uses two blue sub-pixels - a fluorescent deep-blue and a phosphorescent light blue. The introduction of a light blue sub-pixel can significantly extend the operational lifetime of an OLED display and reduce the display's power consumption by as much as 33%.

The RGB1B2 was never adopted (one of the reasons is that adding another sub pixel complicates the TFT backplane and has other disadvantages - but the architecture is now again on the table and UDC presented it again at OLED Korea 2019.

In June 2018 Kyulux and Wisechip unveiled a PMOLED display that uses Kyulux’s Hyperfluorescence yellow emitter. Kyulux updated today that Wisechip is now ready to start producing the HF panel and is seeking customers.

Wisechip eventually settled on a large panel - 73.00 x 41.86 mm (2.7") with a resolution of 128x64. Wisechip says that the power consumption of its HF display is almost half of its regular fluorescent yellow PMOLED.

Researchers from Sweden's Chalmers University have developed a new "double doping" process that basically doubles the efficiency of Polymer OLED emitter materials.

The researchers explain that doping in organic semiconductors operates through what is known as a redox reaction, in which the dopant molecule receives an electron from the semiconductor which increases the electrical conductivity of the semiconductor. The efficiency limit of current doped organic semiconductors has been limited by the fact that each dopant molecule was able to to exchange one electron only. In the new research it was shown how it is possible to move two electrons for every dopant molecule which increases the conductivity of the organic material.

The Fraunhofer FEP institute, the Holst Center and other partners have developed a 15-meter long OLED lighting panel, the longer OLED device ever (beating their own 2017 record of a 10-meter OLED). This work was done as part of the Lyteus, the EU's €14 million initiative within PI-SCALE.

The partners in this project say that this is the first OLED produced using a new unique roll-to-roll (R2R) process that combines the performance of an evaporated OLED stack with solution processing of auxiliary layers.