OLEDs (Organic Light-Emitting Diodes) consist of a multilayer structure of organic materials between two electrodes: Sandwiched between several charge transporting layers, the central layer (emissive layer), guarantees the light emission: Modern OLED displays consist of red, green and blue (RGB) pixels arranged side-by-side. As these pixels are self-illuminating, they do not require a backlight unit like the LED technology. Therefore, OLED displays have a much simpler structure, resulting in thinner display panels. In contrast to the widespread LED technology, OLED displays have many further advantages: they feature low power consumption, a high contrast and a high resolution. Of particular interest is the use of OLED displays on transparent and flexible surfaces, which enable completely new product designs.
OLED technology can also be used for lighting applications. Thanks to the OLED technology, these luminous panels can emit a pleasant, two-dimensional, homogeneous light. In addition, they can be transparent or flexible, and allow new possibilities of integrating illuminating material into architecture or lamps due to their reduced volume and weight. This makes it possible not only to design lighting products in a completely new way, but to create new lighting concepts for the design of interior or exterior facades. The possibilities with flexible devices of various forms represent a disruptive technology to the general lighting market value chain.
The heart of the OLEDs are the so-called emitters. They convert electrical energy into visible light, which leads to the perception of red, green or blue pixels. To date, three different technological concepts can be used to generate light: fluorescence, phosphorescence and thermally activated delayed fluorescence (TADF). The main differences between these concepts are explainable through quantum mechanics. In an OLED, the electrical current leads to an excitation of the molecules and thereby to the creation of singlet and triplet excitons. The energies of the singlet exciton are higher than those of the triplet excitons, but for every singlet exciton three triplet excitons are generated. The first generation of emitters, the fluorescent emitters could only convert the singlet excitons and therefore only 25% of all excitons into light. Triplet emitters, phosphorescent and TADF emitters, on the other hand, can convert up to 100 percent of the excitation energy into light by using both, the singlet and the triplet excited states.
Our highly efficient OLED materials are based on the TADF (thermally activated delayed fluorescence) technology. These materials are designed to reduce electrical stress within the OLED and are thus ideally suited for efficient blue emitter technology. TADF combines the advantages of phosphorescence (high efficiency) and fluorescence (lifetime). Our TADF technology enables us to provide stable and efficient emitters, which allow a significant reduction of the power consumption for OLED devices. TADF technology can be used efficiently for all RGB pixels, which has not been accomplished so far by any technology. Next to blue TADF emitters, CYNORA expects to meet the market requirements for green and red in the next years.
Compatible with the current production processes
Higher display resolution
Reduced power consumption and longer battery operation
Patent protected materials
2x longer battery operation in portable displays
TADF is achieved in an integrated system of dopant, host and transport materials. CYNORA is developing such systems with its customers and partners. Our R&D covers all development aspects from simulation to device fabrication, constantly collaborating with the costumers at all development stages. This efficient approach ensures a fast progress towards the best material set for the customer.
Photophysics & Simulation
Our ideas for new materials are studied first using DFT (density functional theory). With such quantum chemical calculations, it is possible to predict important properties of emitters, like their color or their TADF potential. Promising candidates are then successively selected for synthesis. Besides this screening, DFT calculations are also performed to gain a better understanding of exceptionally good material families and to support the interpretation of complex experimental results.
The synthesis division is responsible for the production of our materials for the customers, as well as for the research and development of new and innovative luminescent materials. Depending on the requirements, synthesis of up to several hundred grams is possible. At the end of the material synthesis, sublimation steps are performed to achieve the highest possible purity for vacuum- based processing.
Detailed material analytics
In addition to the testing of purity, the analytics division is responsible for the complete material characterization from photophysics to electrochemistry. Results from these measurements deliver essential information for device fabrication.
Device optimization and fabrication
CYNORA combines a broad screening of materials in OLED devices with detailed studies towards the customer targets. Consequently, highly promising materials are identified and the stack architecture is constantly being improved.