OLED displays use organic materials that emit light when electricity is applied. OLEDs enable emissive, bright, thin, flexible and efficient displays. OLEDs are set to replace LCDs in all display applications - from small displays to large TV sets.
UDC OLED material performance, 2012
One of the main problems of OLED displays is the limited lifetime of the OLED materials. In past years we have seen great advances in this area, and today OLED materials are quite long lasting - with material lifetime reaching million hours or more.
Blue OLED lifetime
A blue OLED emitter is the most unstable emitter, and blue OLEDs (required to create a full-color display) suffer from short lifetimes. This is especially true for the efficient phosphorescent blue emitter - and today there's still no commercial efficient blue emitter.
The OLED industry is seeking several routes to develop an efficient blue. PHOLED pioneer Universal Display is developing a blue PHOLED, but has yet to find a commercial-ready material. Other promising route is TADF emitter technology.
The latest OLED lifetime news:
Samsung researchers study the degradation of blue PHOLED materials, offer new design strategies for longer lasting blue emitters
Researchers from Samsung Electronics and the Ewha Womans University in Korea collaborated in a new study of the degradation in blue phosphorescence OLED materials. This study demonstrate the importance of controlling exciton-induced electron transfer, and more importantly provides strategies for the design of longer-lasting blue PHOLED materials.
The researchers say that the study reveals the charge-neutral generation of polaron pairs (radical ion pairs) by electron transfer from the dopant to host excitons. According to the study, device lifetime correlates linearly with the rate constant for the annihilation of the radical ion pair.
SEL develops a new Host-Guest system that enables red phosphorescent emitters with 5.4X the lifetime
Researchers from Japan's Semiconductor Energy Laboratory (SEL) developed a novel Host-Guest system that drastically improves the lifetime of OLED emitters. The researchers report that using this system, a deep-red phosphorescent emitter achieved 5.4 times longer the lifetime compared to the same emitter with a conventional system.
The researchers will present the new system at SID DisplayWeek 2018 in May. The new system is not only highly durable, it also satisfies the red chromaticity of the BT.2020 standard.
Taiwan-based Chunghwa Picture Tubes (CPT), in collaboration with European research institute imec (in the framework of the Holst Centre collaboration) have demonstrated an ultra-high resolution OLED display that was patterned using photolithography - without the need for an FMM (metal mask). A photolithography process offers a high aperture ratio, large substrate sizes and good yield control.
The prototype display that was demonstrated is a passive display with a 1400x1400 resolution (or 1250 PPI!) of side-by-side orange and green OLEDs. imec reports that preliminary lifetime investigation shows operation of each color after patterning for a few hundred hours at more than 50% of the original brightness.
A few days ago, Cynora hosted the 2017 International TADF Symposium in Frankfurt, Germany. Cynora reports that about 150 attendees from all over the world listened to experts from the industry and academia and were updated on the latest news regarding TADF OLED emitters.
Cynora itself showed an update on its latest blue emitter. The company now has material that features a CIEy of 0.18 (target - 0.1), EQE of 14% (target 15%) and a lifetime of 10 hours LT97 at 700 nits (target is over 100 hours). Cynora says that development is progressing well and it is confident it will reach its target material performance by the end of the year.
In May 2017 Cynora announced a new blue TADF emitters that achieves a 15% EQE at 1000 nits with an emission peak of 470 nm and a LT97 of > 90 hours (at 700 nits) on a device level. Cynora has stated several times that it aims to commercialize its first highly efficient blue TADF emitter by the end of this year.
According to Cynora, the performance requested from customers is an EQE (at 1000) of over 15%, a lifetime (LT97 at 700 nits) of over 100 hours and a wavelength of 460 nm (color purity FWHM 60 nm).
Taiwan's organic chemicals maker Luminescence Technology (Lumtec) launched a new company called Lumlight to develop and produce OLED Lighting based products.
The company's first product is the OLED EyeCare Lamp, which uses an OLED panel to provide a healthy light source. Lumlight launched a crowdfunding campaign with an aim to raise $120,000 HKD (about $15,000 USD).
Yeolight Technology (which was spun-off Visionox in May 2015) developed a new bright Amber OLED panel. The panel's size is 85x85 mm (active area 76.5x76.5 mm) and its color temperature is 2000K-2600K. The efficiency is >70 lm/W at 2,000 cd/m2 brightness. The lifetime is over 20,000 hours.
This new panel is still a prototype - but Yeolight says it can already be mass produced at the company's 2.5-Gen production line.
Germany-based blue-TADF OLED emitter developer Cynora announced that it achieved a new performance record with its latest blue emitter material - which the company believes is the best overall performance of a high-efficiency blue emitter ever.
Cynora's new blue achieves a 15% EQE at 1000 cd/m² with an emission peak at < 470 nm and a LT97 of > 90 hours (at 700 cd/m²) on a device level. Cynora says that it is very confident that it can commercialize its first highly efficient blue emitter by the end of this year, as planned.
Universal Display announced its financial results for Q1 2017. The company reported an excellent quarter, with revenues of $55.6 million (up 87% from Q1 2016) and net income of $10.4 million (up from $1.9 million in Q1 2016). Material sales were $46.6 million, up 92% over Q1 2016.
Universal Display believes that the OLED industry is poised to grow faster than earlier expectations in 2017, and the company raised its 2017 guidance to at least $260 million to $280 million - reflecting a year over year growth of 30% to 40%.
OLEDWorks latest panel is the Brite 2 - announced in March 2016. The Brite 2 offers a brightness of 300 lumens, a high CRI (>90) and an efficiency of 60 lm/W. According to the company's roadmap, OLEDWorks aims to release 80-100 lm/W flexible panels by next year.
By 2020, OLEDWorks' panels will have an efficiency of over 100 lm/W and a lifetime of over 50,000 hours (LT70).