OLED Technology

OLEDs (Organic Light-Emitting Diodes) are ultrathin self-emissive devices consisting of a multilayer structure of organic materials between two electrodes: Sandwiched between several charge transporting layers, the central emissive layer makes for the light emission. OLED displays consist of the three colors red, green and blue. Being self-emissive, they do not require a backlight unit as it is needed for the LCD technology. Therefore, OLED displays have a much simpler structure, resulting in thinner display panels. In addition, OLED displays have many further advantages: they feature low power consumption, a high contrast ratio and a high resolution. Of particular interest is the use of OLED displays on transparent and flexible surfaces, which enable completely new applications and product designs.

OLED technology can also be used for lighting applications, providing a pleasant, two-dimensional, homogeneous light. In addition, they can be transparent or flexible, thus allowing for new possibilities of integrating illuminating units into architecture or lamps due to their reduced volume and weight. It is thus possible to not only design lighting products in a completely new way, but to create new lighting concepts for the design of interior or exterior facades. The creation of flexible devices of various forms represents a disruptive technology to the general lighting market value chain.

Emitter: the heart of the OLED

The heart of the OLEDs are the emitter materials. These are organic molecules that are able to convert electrical energy into visible light. Depending on their structure, the three colors red, green or blue are generated. 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 their different energy efficiency, which can be explained by quantum mechanics: In an OLED, the electric current leads to an excitation of the emitter molecules and thereby to the creation of singlet and triplet excitons. Due to quantum statistics, 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. Second and third generation 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.

CYNORA's TADF Technology

Our highly efficient OLED materials are based on the TADF (thermally activated delayed fluorescence) technology, enabling highest OLED performance: TADF combines the advantages of phosphorescence (high efficiency) and fluorescence (lifetime). CYNORA’s materials are designed to withstand the electrical stress within the OLED and are thus ideally suited for stable and efficient blue emitters. By using them in an OLED device, the power consumption of the OLED display can be significantly reduced. The TADF technology can be used efficiently for all OLED colors red, green and blue, which has not been accomplished so far by any other 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

Metal-free materials

Patent protected materials

2x longer battery operation in portable displays

CYNORA's Development

In an OLED, efficient TADF emitters are achieved in an integrated system of the emitter itself and its surrounding materials, the host and transport materials. CYNORA is developing such systems with its customers and partners. Our R&D covers all development aspects in a connected closed-loop approach from the simulation of the materials to device fabrication and testing, 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
CYNORA uses various levels of computational material design: CYNORA’s ideas for new materials are studied first in a First-Principle Quantum Chemistry Screening approach, using e.g. DFT (density functional theory) and machine learning (ML). CYNORA’s pioneering strategy allows for predicting important properties of emitters, like their color or their TADF potential. In addition, we include tailor-made AI guided In-silico synthesis for the creating of virtual libraries based on high-volume molecular syntheses. Promising candidates are then successively selected for synthesis. Besides this screening, we focus on innovative Quantum- and Analytical-Data fed Machine Learning Approaches to gain a better understanding of exceptionally good material families via e.g. Heat Maps of structure-property relationships, and to support the interpretation of complex experimental results.

Synthesis
The synthesis division is responsible for delivering our electronic grade ultra-pure organic functional materials for our research and development, as well as for our customers. We have gained operational excellence for high-throughput syntheses, and have installed several tools for real-time monitoring of synthesis KPIs via web-based data monitoring. Due to our excellent trained members, we can handle high-complex synthetic routes towards our target materials. Our in-house scale-up expertise enables us to directly deliver our lead candidates to our customers. 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
The analytics department in CYNORA takes care about all important chemical and photophysical analyses of all in-house produced materials. We apply highest quality standards in order to ensure the accuracy and reliability of these results.

Our methods include measurements to characterize our emitter materials for their required high-level purity, quantum efficiency, energetical properties, and color, amongst others. We also use various steady-state and time-resolved photoluminance measurements to gain deeper insight into our materials. Our laser lab allows for capturing ultrafast processes and material interactions needed for a better understanding. All these information provide important information for carrying out structure-property relationships, and selecting the right materials for our device fabrication and testing.

In addition to these highest quality measurements, we regularly carry out method developments and implement new analytical procedures in order to obtain even more information about our materials.

Device optimization and fabrication
The device optimization and fabrication divisions are responsible to enable the best performance out of our internally developed proprietary emissive materials in devices. Our in-depth knowledge in device physics and core competence in translating structure-property relations into device performance allow us to identify the next generation display materials effectively. We enable future display application by understanding root-causes of device behavior due to stack design and consequent methodology in our design of experiments. The utilization of state-of-the-art fabrication tools and processes further boosts our progress satisfying customer requirements.