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Report

Teaser, summary, work performed and final results

Periodic Reporting for period 1 - DENTADFE (Dendron and Dendrimer Derived Thermally Activated Delayed Fluorescence Emitters for Solution-Processed Non-Doped Device)

Teaser

Summary

Intense effort and activity are underway to find solutions to reduce power consumption and to mitigate global warming. One technology that can address both of these important challenges is energy efficient lighting. In this context, considerable research efforts devoted towards the development of Organic Light-Emitting Diode (OLED)-based lighting and electronic devices, in part due to their much lower power consumption and greater efficiency compared to other lighting technologies. To achieve a truly cost-effective product, devices must be fabricated using cost-effective materials. Thus, I have developed inexpensive emissive pure organic TADF emitting materials to replace the expensive iridium or platinum metal complex. The outcome of this research will establish a new strategy to achieve highly efficient display and lighting at low cost. Apart from contributing to European academic excellence and enhancing Europeâ€™s leading role in organic semiconductor research, outputs from this research will help to make OLEDs accessible to the developing world by contributing to reducing their production cost.

Work performed

Part 1: I have designed, and synthesized pyridine modified carbazole based benzophenone TADF emitter. Fabricated OLEDs using these materials as an emitter and achieved very deep blue OLEDs which is main focus in the OLED industry. I have developed variety of TADF emitting materials for cost effective TADF based OLEDs. Using these materials, we have achieved efficient deep blue OLEDs. This work is published in J. Photon. Energy, 2018, 8, 032106.
Part 2: I have used TADF materials in two component gel formation which can be utilized in bio-imaging and solution processed OLEDs. This spontaneously assembled highly ordered networks are essential to improve the quality of thin films in stacked device architectures and enhance the performances of solution-processed organic light emitting devices (OLEDs). This work published in ACS Appl. Energy Mater. 2018, 1, 649.
Part 3: I have developed sulfone based TADF emitter for deep blue emitters and achieved very deep blue OLEDs with EQE of 13.0%. This work is submitted to JMC-C for publication and it is under revision and another extension work of sulfone will be submitted soon. We have submitted for UK patents and application no is Application No: GB1806488.1, Filing Date: 20 April, 2018.
Part 4: We have developed the host materials for the yellow TADF emitters and I have fabricated the device and achieved highly efficient yellow TADF OLED with reduced roll-off.
Part 5: I have developed series of dendrimer based TADF emitter and it will be published soon.

Final results

Energy security and climate change and two interwoven global societal issues that will continue to dominate the 21st century that are particular salient for fast developing world. Intense effort and activity are underway to find solutions to reduce power consumption and to mitigate global warming. One technology that can address both of these important challenges is energy efficient lighting. In this context, considerable research efforts devoted towards the development of Organic Light-Emitting Diode (OLED)-based lighting and electronic devices, in part due to their much lower power consumption and greater efficiency compared to other lighting technologies. In the past few decades organic light-emitting diodes (OLEDs) have come to the fore as the display technology of choice in a growing number of consumer electronics applications, including flat panel large screen televisions, smart phones, and smart watches. The external quantum efficiency (EQE) of the OLED is dictated in part by the internal quantum efficiency (IQE) of the device that is itself a function of the nature of the emitter material. The maximum IQE is typically 25% when the emitter is fluorescent and increases to 100% for heavy metal phosphorescent emitters. We have developed best alternative inexpensive and more sustainable emitters to replace the less abundant and expensive metal complex emitters for cost effective OLEDs. The outcome of this research will establish a new strategy to achieve highly efficient OLED device at low cost. According to Transparent Mark Research the global OLED displays market is expected to reach $100 billion by 2050, which will increase European economy in the near future.