Ratiometric Thermometry Inside a Working Organic Light-Emitting Diode

Objective

One of the major challenges with organic light-emitting diodes (OLEDs) is their short lifespan. Flow of electric current causes an increase in its internal temperature which damages molecules consequently reducing the lifetime of OLED devices. To enhance the stability of OLEDs and increase their lifetime, monitoring and controlling the internal temperature of OLEDs is of fundamental importance. However, no systems/techniques are currently available to measure the internal temperature of working OLEDs. RatioLED introduces an innovative approach that exploits the thermally activated delayed fluorescence to measure the internal temperatures in OLEDs under working conditions for the first time using a robust ratiometric approach. It will have a significant impact and will extend the boundaries of thermometry and OLED technologies. This interdisciplinary project will be made possible by incorporating the researcher's quantum chemistry and spectroscopy skills and extensive experience in the luminescence thermometry of the host. RatioLED aims to enhance the energy efficiency of OLEDs which is in line with the Energy Efficiency Directive of the European Parliament and the EU’s climate ambition. Further, thermometry is also pivotal for the design and fabrication of devices for applications in several other disciplines, including microelectronics, photonics, and nanofluidics, therefore, RatioLED will pave the way to industrial innovation and economic growth that aligns with UN sustainable development goals (SDGs 8 & 9). Prof. Markus Suta is an expert in luminescent materials and has vast experience in thermometry, making him an ideal supervisor for this project. Additionally, UDUS, due to its excellent infrastructure and credible support system, will provide a conducive environment for research and the researcher’s personal growth. The project will help the researcher's career development by providing interdisciplinary technical skills and comprehensive management training.