Perovskites - Page 3

Researchers from Japan's Kyushu University developed new OLED devices made by integrating OLED emitters with thick layers of hybrid perovskite materials. The researchers say that such a device structure to enable lower-cost production and better viewing angles in OLED displays.

OLED devices usually use a very thin layer of organic materials, as these are poor conductors, which makes production more difficult and also leads to cavity effects which distorts the emission color. The thick perovskite-OLED hybrid layer (which is around 2,000 nm thick) are more easily processed compared to thin film layers while still being highly conductive.

China-based display maker CSoT demonstrated several new OLED display prototypes and technologies at SID 2019, and this great new video shows these displays in action.

First up is a 31" 4K (3840 x 2160, 144 PPI) AMOLED that was produced using an ink-jet printing process on an IGZO substrate. The peak brightness is 200 nits and the refresh rate is 120 Hz. This seems to be the same panel announced in March 2018 by Joshua Printing Display Technology (established by CSoT and Tianma in 2016). The display has some noticable defects.

Researchers from Korea's Ulsan National Institute of Science and Technology developed a new perovskite-based LED (PeLEDs) which are flexible enough to fold and are also transparent. It seems as if these LEDs are similar to OLED devices and provide area-lighting and not point-lighting like inorganic LED chips.

Perovskite-based LEDs have been demonstrated before, but this is the first time a transparent and flexible one has been developed, according to the researchers. Perovskite LEDs feature high electron mobility, good color purity, and easy color control.

Truly emissive Quantum Dots LEDs is a potential next-generation display technology, that's been under development for many years. In the past years, we've seen great interest in perovskite materials and perovskite-based Quantum Dots, while still at an early stage of research, are showing great promise. Our sister site Perovskite-Info published an interesting article by Ossila that discusses the merits and current status of pQDs.

We have recently published a guide to perovskite materials, technology and industry which we consider a valuable source of early stage information for anyone wishing to keep up with the latest trends in our industry.

The OLED-Info team takes pleasure in recommending our new book - The Perovskite Handbook, which gives a comprehensive introduction to perovskite materials, applications and industry. We believe that any display professional would find that perovskite materials are an area of focus that should not be ignored.

Perovskites offer a myriad of exciting properties and has great potential for the display industry. The promising perovskite industry is currently at a tipping point and on the verge of mass adoption and commercialization and the first display-related perovskites are already reaching the market.

The world's leading display conference, SID DisplayWeek, is now over, and it was a great event. This is just a quick first impression post - you can expect many more OLED-Info articles in the next couple of weeks after we get back to the office and sort through all the materials, interviews, photos and videos we have.

While LCD is still the dominant display technology in many applications, it is clear that OLEDs are taking over as the most promising technology, and we have seen exciting presentations and demonstrations from many companies. It was interesting to see how the three Chinese OLED makers at SID, BOE, Visionox and Tianma, have large booths with many flexible and foldable OLED displays and end products, while Samsung and LG Display both have very limited show areas compared to previous years. This is an interesting evidence to China's rising dominance - but also to Samsung's and LGD's focus on more consumer trade shows such as CES.

Perovskite materials offer exciting properties which make them useful for solar panels, fuel cells, lasers - and even displays. Many believe Perovskites are the future of solar power and some estimate that perovskite QD adoption in display and LED applications is right around the corner. Our new video below gives a short introduction to perovskites:

For more information on perovskites and to stay updated on these exciting materials, check out our Perovskite-Info knowledge hub!

Researchers at Korea's Pohang University developed a perovskite LED (PeLED) - that could be used to create displays and lighting panels, one day. PeLEDs have been shown before - but with very limited luminous efficiency. Now the researchers claim that the efficiency of their PeLEDs compete with phosphorescent OLEDs.

The main problem in PeLEDs has been the significant exciton dissociation in perovskite layers. The researchers managed to overcome this by fine stoichiometric tuning that prevents exciton dissociation, and also by nanograin engineering that reduces perovskite grain size, and concomitantly decreases exciton diffusion length.